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BEST TELEPHOTO ZOOM LENS 300mm+ for wildlife: Sony A7CR vs APS-C, 4/3, 1″

How well can telephoto zoom lenses magnify distant wildlife given their weight and price?  Below, Tom recommends all-in-one camera systems and compares interchangeable lens options.

The world’s best travel system (read Tom’s review) with wildlife telephoto reach is the Sony A7CR (2023, 18.2 oz, price at Amazon) 60-megapixel full-frame-sensor camera mounted with its sharpest travel lens, the 8x optical zoom Tamron 25-200mm F2.8-5.6 Di III VXD G2 for Sony E-mount (2025, 20.3 oz) — 38.5 ounces total including body, lens, battery, and memory card. This system is significantly sharper than the discontinued Sony RX10M4, my previous wildlife winner — when field tested from 28mm through 450mm equivalent, a 16x zoom range. Further cropping this 200mm 60-MP A7CR down to its sharpest central 6.7 megapixels (3168 x 2112 pixels, one ninth of the sensor, 600mm equivalent) resembles at least 10 MP shot on RX10M4 — sufficient for publications.

To further magnify birds, wildlife photographers may prefer mounting Sony A7CR with a 6x-zoom Tamron 50-300mm F/4.5-6.3 Di III VC VXD Lens (2024, 23.5 oz, Amazon), together 42 ounces.  In comparison, blurrier images are captured on its 11x-zoom sibling Tamron 28-300mm F4-7.1 Di III VC VXD Lens (2024, 21.5 oz), not recommended. Angles of view wider than 50mm could be covered by a smartphone, pocket camera, or a swapped lens such as Tamron 20-40mm F2.8 VXD (2022, 12.9 oz, Amazon), also good for astrophotography.

CONTENTS ■ Best all-in-one travel telephoto ■ 500-600mm for Sony ■ Multi-lens APS-C & Micro Four Thirds ■ Cheaper all-in-one wildlife cameras ■ Telephoto tips ■ Image Stabilization ■ Ultrasonic focusing motors ■ Legacy DSLR, optical viewfinder ■ discontinued Sony RX10M4 ■ Terminology

500-600mm wildlife telephotos for full-frame Sony E-Mount

Beyond the above setups, photographing small birds and distant wildlife will be significantly sharper using a 500- to 600-millimeter lens. Mount the following lenses on an 18-ounce Sony A7CR (Amazon) or other Sony A7 series cameras:

Multi-lens telephoto systems on APS-C and Micro Four Thirds sensors

Offered for comparison, the following rival systems using smaller sensors magnify wildlife sharply, but onto fewer megapixels (just 40-55% of the 60-MP full-frame-sensor Sony A7CR).

Serious photographers of wildlife or birds using an APS-C size sensor camera should mount telephoto lenses labeled at least 300mm (with an angle of view on a 35mm sensor equivalent to 450mm mounted on a Nikon camera or 480mm on Canon) on a well-reviewed camera with the greatest number of megapixels. If your telephoto lens falls short of 300mm, cropping to enlarge subjects creates blurrier results than would optical enlargement. The following telephoto zoom lens reaching 300mm can enlarge wildlife well on Sony A6xxx series MIRRORLESS E-mount APS-C-sensor cameras such as the 24-MP 14-oz Sony 6400 or A6300 (read Tom’s review):

Superior lenses having “fast” f4 or f/2.8 brightest aperture excel for indoor action but are a heavy burden when traveling; whereas a moderately brightest aperture of f/5.6 or f/6.3 saves money and weight and can still take decent images in good daylight.

Larger magnification of wildlife requires a heavier commitment, as in the following high-quality systems:

  • 44+ oz for 160-640mm equivalent lens on a MIRRORLESS camera with 33-MP APS-C sensor, the best price value on this list: 
    Canon RF 100-400mm f/5.6-8 IS USM lens (2021, 22.3 oz, well-reviewed by Ken Rockwell) mounted on a Canon EOS R7 camera (2022, 22 oz, 33 MP, in-body image stabilization rated at up to 7 stops). Consider upgrading to the 45-MP full-frame Canon EOS R5 camera (2020, 26 oz) totaling 48+ oz together. And/or consider upgrading to a brighter but significantly-heavier lens:
  • 70+ oz for sharper 160-800mm equivalent lens on a MIRRORLESS camera with 33-MP APS-C sensor:
    Canon RF 100-500mm F4.5-7.1L IS USM lens (2020, 48 oz alone or 54 oz with tripod mount; optical Image Stabilization with up to 5 Stops of Shake Correction) mounted on a Canon EOS R7 camera (2022, 22 oz, 33 MP, in-body image stabilization rated at up to 7 stops). Consider upgrading to the 45-MP full-frame Canon EOS R5 camera (2020, 26 oz) to better optimize use of this lens, together weighing 74+ oz.
  • 84+ oz for 225-900mm equivalent lens on a MIRRORLESS camera with 24-MP APS-C sensor:
    Sigma 150-600mm f/5-6.3 DG DN OS Sports Lens for Sony E-Mount (2021, 74.1 oz, Amazon) on Sony Alpha A6400 camera (2019, 14 oz, 24 MP). This Sigma lens gives the best telephoto quality & reach for the money, if you don’t mind bulky lens-swapping. But if you can spend more on the camera body, this lens will be better leveraged on a full-frame 60-MP Sony A7CR.
  • 49-58+ oz for 200-800mm equivalent zoom lens on a MIRRORLESS camera with 25-MP Micro Four Thirds sensor:
    Panasonic Leica DG Vario-Elmar 100-400mm f4.0-6.3 version II ASPH OIS (2023, 35 oz, 72mm filter size, 3.3 x 6.8″) mounted on Panasonic Lumix G9 II (2024, 23 oz body, 25 MP, 390 shots per battery charge CIPA) or lighter-weight Panasonic DMC-GX9 mirrorless camera (2018, 14.4 oz body, 20 MP, 260 shots per battery charge CIPA) all weather-sealed. Compared to the Version I lens released in 2016, Version II adds support for Panasonic’s 1.4x and 2.0x teleconverters, where zoom range can extend up to 1600mm-equivalent and allows full life-size macro photography with maximum magnification of up to 1.0x with the 2.0x teleconverter. Lens features freezeproof, splash-proof, and dust-proof construction. ■ This Panasonic lens has a “full-frame-equivalent” brightest aperture of f/8 at 200mm equivalent and f/12.6 at 800mm.

Compared to all-in-one solutions, interchangeable lens systems add weight, bulk, and the inconvenience of swapping lenses to cover wider angles of view.

CROP FACTOR defined: Cameras with APS-C size sensors have an “angle of view crop factor” that extends the telephoto by 1.5x for Nikon (or 1.6x for Canon) cameras, when compared to using the same lens on 35mm sensor or 135 film. For example, a travel lens labeled 18-200mm focal length has the angle of view of a “27-300mm” in terms of 35mm sensor or 135 film, when mounted on a Nikon DX format camera such as the Nikon D5600, D5100, D5000, D3300, or D60. The Nikon AF-S DX 18-200mm f/3.5-5.6G ED VR II Zoom Lens served me well as an all-around travel lens from 2009-2012. Its flexible 11x zoom range caught all the action without the interruption of lens changes! But 200mm telephoto (300mm equivalent) on a 24 MP APS-C camera falls short of serious wildlife photo enlargements, except for web display or small prints. A Nikon DX 18-300mm f/3.5-5.6G ED VR lens (27-450mm equivalent) better enlarges distant animals.

Cheaper, all-in-one wildlife telephoto cameras using smaller sensors

The following wildlife telephoto cameras are cheaper than the above systems but generally capture blurrier images. These all-in-one cameras conveniently don’t swap lenses:

  1. 50 oz for 24–3000mm equivalent 125x zoom lens f/2.8–8.0 on 1/2.3″ sensor: Nikon COOLPIX P1100 (2025, 16 MP, USB-C port) and nearly identical Nikon COOLPIX P1000 (2018, 16 MP, micro-USB port) attract birders and wildlife enthusiasts. In comparison, no practical DSLR or rival interchangeable mirrorless lens can reach 3000mm! Both P1100 and P1000 have 4-stop CIPA-standard image stabilization and fully articulated LCD, but only get 250 shots per charge. ■ As in COOLPIX P950, their tiny 1/2.3″ sensor won’t beat the superior processing power of cellphone cameras unless shooting at telephoto greater than 50mm equivalent, in bright outdoor light. ■ At this tiny sensor size, extra diffraction through the camera’s minuscule aperture degrades image quality. ■ Rival cameras would better cover 24-1000mm; for example, the 1″-sensor Sony RX10M4 (discontinued) shot at 600mm can be digitally cropped by 2x to outshine the P950, P1100, and P1000 up to about 1200mm equivalent. Based upon Nikon P1000 moon photos (Lensrentals.com), compared to my own moon shots on Sony RX10M4 at 600mm-equivalent, shooting the P1000 at 1500-3000mm equivalent may be sharper than digitally cropping RX10M4 to achieve the same angle of view. (Nikon’s “Moon Shot Mode” is JPEG only, no raw.) The comparison requires bright light, as with the sunlit lunar surface; but in dim light, RX10M4 will gain ground.
  2. 35 oz for 24–2000mm equivalent 83x zoom lens f/2.8–6.5 on 1/2.3″ sensor: Nikon COOLPIX P950 (2020, 16 MP). Fully articulated LCD. 290 shots per charge. P950 adds a flash hot shoe and can record RAW files (whereas older P900 only captured JPEGs). Compare with P1100 and P1000 above.
  3. 28.5 oz for 25-400mm equivalent 16x zoom lens f/2.8-4 on 1″-Type sensor: Panasonic FZ1000 version II (2019, 20 MP) is a great value that practically antiquates DSLR cameras for on-the-go travelers. Its excellent 1″-Type sensor can be cropped down from 20 MP to digitally extend telephoto reach.
  4. 33 oz for 24-480mm equivalent 20x zoom lens f/2.8–4.5 on 1″-Type sensor: Panasonic FZ2500 (2016, 20 MP) with fully articulated LCD with touchscreen, great viewfinder magnification, best video specs (ND filter, Cine/UHD 4K). But compared to Sony’s discontinued RX10M4 & RX10M3, Panasonic’s FZ2500’s lens collects a half stop less light (slightly lowering image quality), its telephoto doesn’t reach long enough for birders, and its CIPA battery life of 350 shots is short (vs 420). FZ2500 is FZ2000 in some markets.

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TELEPHOTO TIPS: How to avoid out-of-focus shots on any camera

  • Most lenses for APS-C and full-frame cameras are sharpest across the frame from center to edge when stopped down one or two stops from wide open. f/8 is easiest to remember as a good optimum that reduces the chromatic aberrations of wide open and prevents the light diffraction of smaller openings at high aperture numbers such as f/16 and f/22. For example, to maximize the “sweet spot” of the excellent Tamron 28-200mm F2.8-5.6 Di III RXD lens for Sony E-Mount, stop down by two stops from each brightest aperture (or double the f-number) — so at 28mm, use f/5.6 — at 50mm use f/7 — and at 100mm-200mm use f/9 (according to my field testing).
  • Make sure image stabilization (IS, VR, OS, VC, OIS, or IBIS) is turned on for all hand held shots (especially when using telephoto), to counteract blurring due to hand shake at slower shutter speeds.
  • Focus will be most difficult towards longest telephoto end of the zoom, due to hand shake and lens limitations, especially in dim light. At 400mm using Canon IS or Nikon VR on an APS-C sensor, shoot at about 1/125th second or faster for sharper shots. For APS-C cameras in general, divide the lens mm by two, and the inverse is near the slowest possible sharp shutter speed when image stabilization is turned on. Newer technology may improve this. Raising ISO will help achieve faster shutter speeds.
  • Automatic multi-point focus usually hunts for the closest, brightest object, and is often not what you wanted to focus on, but can react faster than your fingers for capturing wildlife, sports, and action.
  • For shooting non-moving subjects, a single AF point in the center is more accurate. On Sony cameras, for most of my shots I prefer Focus Area = Expand Flexible Spot. Lock focus, recompose, then release the shutter. On many cameras, when using a single AF point, it’s easy to accidently press the “AF point selection” off center or forget that it’s off center, focusing on a location different than you thought. Some of the heavier, pricier DSLR models can lock AF point selection to avoid the common problem.

Image stabilization reduces tripod use!

For sharper handheld shots in significantly dimmer lighting situations without a tripod, choose lenses designed with image stabilization (VR, IS, OS, or VC); or get a camera with in-body image stabilization (IBIS). By eliminating much time formerly spent setting up a tripod, I can better keep pace with non-photographers on group treks.

The Sony Alpha (A-series) builds image stabilization into the camera body (IBIS) with sensor-shift technology. Older Sony cameras used “SteadyShot INSIDE.”

Ultrasonic focusing motors lock onto flighty animals faster

  • Canon – USM, UltraSonic Motor
  • Nikon – SWM, Silent Wave Motor
  • Sigma – HSM, Hyper Sonic Motor
  • Tamron – RXD (Rapid eXtra-silent stepping Drive, new in 2018) and earlier PZD (Piezo Drive autofocus system, new in 2010, powered by a fast and quiet standing-wave ultrasonic motor)
  • OM System (formerly Olympus, before 2022) – SWD, Supersonic Wave Drive
  • Panasonic – XSM, Extra Silent Motor
  • Pentax – SDM, Supersonic Drive Motor
  • Sony & Minolta – SSM, SuperSonic Motor

Wildlife telephoto lenses for DSLR (mirror) cameras

are covered in Tom’s archive article at this link. DSLR-style cameras provide a traditional optical viewfinder — a bulky legacy design which I quit in 2012, when I replaced my Nikon D5000 with a superior Sony NEX-7. I prefer a compact mirrorless camera with an Electronic Viewfinder / EVF — to better realize “what you see is what you get (WYSIWYG).” The autofocusing speed of mirrorless cameras now rivals DSLRs.

An iridescent blue, orange and green Danfe (or Danphe) Pheasant, the national bird of Nepal, Namche Bazaar in Sagarmatha National Park.
2007 Photo: In Sagarmatha National Park near Mount Everest, this flash of iridescent blue, orange and green is a Danfe or Danphe Pheasant — the national bird of Nepal. Published in “Light Travel: Photography on the Go” book by Tom Dempsey 2009, 2010. The pheasant, 70 feet away in fog, would have been sharper if I had used a telephoto longer than 200mm (300mm equivalent in terms of full-frame sensors) and/or a more recent camera with more megapixels. [I shot this at 200mm using an all-in-one Nikon 18-200mm lens on a Nikon D40X DSLR (new in 2007, with DX format 10-MP APS-C sensor, 3872 x 2592 pixels), cropped to 858 x 1002 pixels to make an acceptable 4×6-inch print.]

Sony RX10 IV (2018 – March 2025, discontinued)

For serious photography of wildlife and general travel subjects, my top pick from 2018-2025 was the 39-oz Sony RX10 IV (RX10M4) mirrorless camera — discontinued in March 2025 — read Tom’s review. Its bright 25x zoom f/2.4-4 lens is remarkably sharp from edge-to-edge from 24-600mm equivalent. In 2025, I upgraded to the full-frame-sensor Sony A7CR camera mounted with 8x Tamron zoom — read Tom’s review.

Terminology and metric conversions

  • oz = ounces = the above camera weights in ounces (oz) include battery and memory card.
  • g = grams. Multiply ounces by 28.35 to get grams.
  • sec = second
  • mm = millimeters. A centimeter (cm) equals 10 millimeters. Multiply centimeters (cm) by 0.3937 to get inches.
  • ILC = Interchangeable Lens Compact = “midsize mirrorless camera” term used here on Photoseek.com
  • DSLR = Digital Single Lens Reflex = a traditional camera where an optical viewfinder uses a mirror to see through the interchangeable lens.
  • EVF = Electronic Viewfinder
  • LCD = Liquid Crystal Display. OLED (Organic Light-Emitting Diode) beats an LCD in dynamic range from darkest to brightest and consumes less power.
  • MP = megapixel, in the context of camera sensors, refers to one million pixels, where a pixel is the smallest unit of information in a digital image.

“equivalent“ lens =
To compare lenses on cameras having different sensor sizes, equiv or equivalent lens refers to what would be the lens focal length (measured in mm or millimeters) that would give the same angle of view on a “full frame” 35mm-size sensor (or 35mm film camera, using 135 film cartridge). Compared lenses are “equivalent” only in terms of angle of view. (To determine sharpness or quality, read lens reviews which analyze at 100% pixel views.)

“Crop factor” =
how many times smaller is the diagonal measurement of a small sensor than a “full frame” 35-mm size sensor. For example, the 1.5x crop factor for Nikon DX format (APS-C size sensor) makes a lens labeled 18-200mm to be equivalent in angle of view to a 27-300mm focal length lens used on a 35mm film camera. The 2x crop factor for Micro Four Thirds sensors makes a lens labeled 14-140mm to be equivalent in angle of view to a 28-280mm lens used on a 35mm film camera.

“10x zoom” =
zoom lens telephoto focal length divided by its widest-angle focal length. For example, a 14-140mm focal length zoom has a 10x zoom range (140 divided by 14). An 18-200mm zoom has an 11x zoom range (200 divided by 18).

Superzoom
in 2013 refers to lenses of about 15x zoom range or larger. Steady quality improvements in the resolving power of sensors has made possible superzoom cameras in ever smaller sizes. As superzoom range increases, laws of physics require lenses to focus upon smaller sensors (light detectors) or else to increase lens size. For a given level (most recent year) of technological advancement, a camera with physically larger sensor (bigger light detecting area) should capture better quality for a given zoom lens range.

“equivalent” F-stop
refers to the F-stop (F-number) on a full-frame-sensor camera which has the same hole diameter as the F-stop of the camera lens being compared. The concept of “equivalent” F-stop lets you compare capabilities for creating shallow depth of field on cameras with different-size sensors. Smaller-sensor cameras use shorter focal lengths for the same field of view, so at a given F-stop they have a smaller physical aperture size, meaning more depth of field (with less blur in front of and behind the focused subject). Formula: F Number (or Relative Aperture) = actual focal length of lens divided by diameter of the entrance pupil.

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12 thoughts on “BEST TELEPHOTO ZOOM LENS 300mm+ for wildlife: Sony A7CR vs APS-C, 4/3, 1″”

  1. Scott
    Reply

    I have a D5500 with a 70-300 IF ED VR lens and am looking at either the Tamron 150-600 USD or the Sigma 150-600 C to extend my reach for wildlife since I can’t add a teleconverter to the 70-300. I hear the Sigma might not AF fast/ consistently as the Tamron but is slightly sharper on the long end. The Nikon 200-500 is just to much for me. Any words of wisdom would go along way.

    1. Tom Dempsey
      Reply

      The following reviews of Tamron 150-600 USD versus Sigma 150-600 Contemporary may shed light:

      http://www.the-digital-picture.com/News/News-Post.aspx?News=15236
      where the article says “Which lens is better?…I lean slightly toward the Sigma, partially because…at least at f/8, the Sigma holds the optical advantage at 600mm.”

      PCMag says the Tamron SP 150-600mm f/5-6.3 Di VC USD is “not quite as good as our Editors’ Choice Sigma 150-600mm F5-6.3 DG HSM Contemporary”:
      http://www.pcmag.com/article2/0,2817,2488745,00.asp

      The following is an interesting comparison under African safari conditions of Tamron 150-600 USD versus the Sports model, Sigma 150-600mm F5-6.3 DG OS HSM Sports (which is bigger, heavier & pricier than Sigma’s Contemporary model); although shot on different camera bodies with different settings by different photographers, their actual field results may inform your own gear choices:
      http://www.kruger-2-kalahari.com/tamron-vs-sigma-150-600.html

      More reviews:

      http://www.ephotozine.com/article/sigma-150-600mm-f-5-6-3-dg-os-hsm-contemporary-review-27247

      http://www.ephotozine.com/article/tamron-sp-150-600mm-f-5-6-3-di-vc-usd-lens-review-23866

  3. Al Hannan
    Reply

    Thanks for all the info. I didn’t know about the Sigma 150-600mm Contemporary until I hit your site looking for recommendations. I just picked one up and it is an excellent long zoom lens. It is big and it will give you a work out carrying it around, but it is comfortable to shoot. It includes a strap for the lens so the camera / camera strap is not bearing the weight. No problem shooting hand held during the day with the OS at 600mm (900mm on my D7100) at 1/50s right out of the box. This should be a fun lens to take to the zoo!

  4. Farzad B Mistry
    Reply

    hi, have a nikon d5000 along with 18-55mm and 55-300mm lenses. interested in wildlife and birding. could you please suggest a couple of lenses that are compatible and usefull in these sightings.

    1. Tom Dempsey
      Reply

      I suggest upgrading your 12mp Nikon D5000 (released in 2009, 23 ounces) to 24-megapixel Nikon D3300 camera (new in 2014, 16 ounces): by doubling camera megapixels, you can crop more to enlarge distant subjects (thereby improving telephoto magnification digitally). Because birds and wildlife can move quickly, you may want to upgrade your 55-300mm lens to one with faster autofocus:
      – Nikkor AF-S VR Zoom 70-300mm F4.5-5.6G ED-IF lens (26 oz, 2000). This lens worked great for me photographing fleeting hummingbirds in Ecuador. Or instead, put that money towards a heavier lens with twice the magnification of distant wildlife and birds:
      – Tamron SP 150-600mm F/5-6.3 Di VC USD (2014, 69 oz/4.30lb/1951grams, 4.2 x 10.2 inches), with the best optics for the money in its class.

  6. Tord S Eriksson
    Reply

    Hi, Read with interest about which is the best telphoto lens, and while I agree about most, there is another cat in town, so to speak! The Nikon 1 70-300CX is an outstanding lens, easily beating my old telephoto lenses, including, among others, the Sigma 150-500, the Sigma 120-400, the Nikon AF-S 70-300 VR, and in most situations even beating my prized AF-S 80-400 VR II N. Sadly, to work, the lens needs a Nikon 1 camera (so it is of no use on my Nikon FX cameras, but considering that you can get the latest most expensive Nikon 1 camera plus the lens for the same price as the new 80-400, then it is an easy choice)! At DPReview’s Nikon 1 Forum you’ll find numerous examples of what this amazing lens can do, especially with a V3 attached, and a good photographer. Other than that, I agree fully to your conclusions, even if they are a bit out of step with time, but aren’t we all?! Have a nice day!
    Addendum: The 70-300CX is very hard to find, and I am still waiting for mine, while the wife has had hers for quite a while. The major advantage with this superbly sharp lens is that it is amazingly sharp in the long end, and it is so small that it fits in a jacket pocket! I do wish my AF-S 80-400 VR II was just as compact, and light — sadly it is far from that!

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