If you're comparing an SLRs viewfinder's magnification to a binocular, 1x = 70mm. If you take your 400mm lens and compare it to an 8x Canon binocular (I've done this side by side) you're going to be seeing a lot more details on the binocular. In fact you need 560mm to make the magnifications equal. So, if you slap on the 1.4x TC to the 400mm (I've done this too) they look almost identical (although the binocular is a lot brighter.)

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I have been asked to write a brief instructional article aimed at hunters to illustrate "How to Shoot Without a Gun", i.e., shooting wildlife with a camera. In an effort to relate the focal length of a telephoto lens to the "power" of a rifle scope or binoculars, I need to know what "magnification" is produced by a 400mm, 500mm, and 600mm telephoto lens. To state it another way, what would be the approximate focal length of a 6x rifle scope?

This is what actually matters, the magnification, for both considering the shake of a setup and also the details you'll actually see the viewfinder. Note this has nothing to do with field of view, which can vary drastically with a given X factor of a binocular.

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What’s the best camera for around $1500? These midrange cameras should have capable autofocus systems, lots of direct controls and the latest sensors offering great image quality. We recommend our favorite options.

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In telescopes, Magnification = focal length divided by observing lense diameter. A 20mm lense looking through a 2000mm scope gives you 100x mag.

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This is what actually matters, the magnification, for both considering the shake of a setup and also the details you'll actually see the viewfinder. Note this has nothing to do with field of view, which can vary drastically with a given X factor of a binocular.

Bill, You might try some research on field glasses, scopes, etc. Maybe you might find out what focal length is considered "1x" for those applications. I don't think that there is anything particularly unique to 50 mm except that it has a "convenient" field of view at a few feet and, hence, has become a standard.

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If you've got a pair of 7X binoculars around compare the field of view (look through one side only) to a 35mm lens. You'll find you need about 350mm to get the same FOV. Divide by the crop factor for digital, on the 10D a 200mm lens gives you about the same FOV as 7X.

What’s the best camera for around $2000? This price point gives you access to some of the most all-round capable cameras available. Excellent image quality, powerful autofocus and great looking video are the least you can expect. We've picked the models that really stand out.

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I have been asked to write a brief instructional article aimed at hunters to illustrate "How to Shoot Without a Gun", i.e., shooting wildlife with a camera. In an effort to relate the focal length of a telephoto lens to the "power" of a rifle scope or binoculars, I need to know what "magnification" is produced by a 400mm, 500mm, and 600mm telephoto lens. To state it another way, what would be the approximate focal length of a 6x rifle scope?

A camera is a fixed viewing aperture and you vary the focal length, the exact opposite of a telescope. So it will depend on the diameter of the viewing area of your camera.

approximate distance across the diagonal of a 24x36 frame so in fact the standard lens for a 35mm format is (24^2 + 36^2) ^ .5 = 42.3mm

A faster sensor, improved autofocus and video see Nikon's third-gen mid-range full-framer go toe-to-toe against Canon's EOS R6 II and the Sony a7 IV. We feel its all-round ability lifts it to the top of the pile.

We don't usually test a product for ten years before reviewing it, but after a decade of using the Lowepro Photo Sport 300 AW II on an almost daily basis, Managing Editor Dale Baskin tells us why he loves this pack.

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consideration with optics when hunting. Also, many (Shutterbug being the most recent I've seen) consider that 28mm in 35mm format most closely approximates what the eye sees.

I have been asked to write a brief instructional article aimed at hunters to illustrate "How to Shoot Without a Gun", i.e., shooting wildlife with a camera. In an effort to relate the focal length of a telephoto lens to the "power" of a rifle scope or binoculars, I need to know what "magnification" is produced by a 400mm, 500mm, and 600mm telephoto lens. To state it another way, what would be the approximate focal length of a 6x rifle scope?

If you want a compact camera that produces great quality photos without the hassle of changing lenses, there are plenty of choices available for every budget. Read on to find out which portable enthusiast compacts are our favorites.

I just did compare 400mm 5.6L+1.4TC+10D with 8x Nikon binocular. I can say that binocular looks much brighter and more details.

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Actually it's more than twice, but the math gives me a headache. Two lenses placed X distant apart if viewed simultaneously will give you the gathering power and resolution of a lense equal to the distance between them. It's called an interferometer. The KEK scopes in Hawaii are a prime example. Weird....

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Leon Wittwer wrote: Bill, You might try some research on field glasses, scopes, etc. Maybe you might find out what focal length is considered "1x" for those applications. I don't think that there is anything particularly unique to 50 mm except that it has a "convenient" field of view at a few feet and, hence, has become a standard.

The Angle series of high-performance LED products offer sleek forms with unmatched versatility for indirect illumination. Angle is designed with strict attention to performance details - beam control, distribution shape, forward throw, and efficacy- packaged in a sleek, compact form.

What's the best camera for travel? Good travel cameras should be small, versatile, and offer good image quality. In this buying guide we've rounded-up several great cameras for travel and recommended the best.

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I have been asked to write a brief instructional article aimed at hunters to illustrate "How to Shoot Without a Gun", i.e., shooting wildlife with a camera. In an effort to relate the focal length of a telephoto lens to the "power" of a rifle scope or binoculars, I need to know what "magnification" is produced by a 400mm, 500mm, and 600mm telephoto lens. To state it another way, what would be the approximate focal length of a 6x rifle scope?

Jason Hutchinson wrote: If you're comparing an SLRs viewfinder's magnification to a binocular, 1x = 70mm. If you take your 400mm lens and compare it to an 8x Canon binocular (I've done this side by side) you're going to be seeing a lot more details on the binocular. In fact you need 560mm to make the magnifications equal. So, if you slap on the 1.4x TC to the 400mm (I've done this too) they look almost identical (although the binocular is a lot brighter.)

I thought about this "rule of thumb" stated a little differently. A 50mm lens is called a "normal" lens because it approximates what is normally seen with the unaided eye. How precisely does this hold up for longer lenses?

Afterthought: Maybe you should think in terms of field of view. Pick a standard "critter" like a deer at 10 ft. The deer should be easy to see with the eye. What focal length in a camera would frame the deer. That might serve as your "1x" reference. Leon

Afterthought: Maybe you should think in terms of field of view. Pick a standard "critter" like a deer at 10 ft. The deer should be easy to see with the eye. What focal length in a camera would frame the deer. That might serve as your "1x" reference. Leon

A-Light is pleased to announce the introduction of its Mira architectural luminaire. Mira is designed to provide functional illumination indirectly, using ceilings and walls as a reflector.

Leica has announced the Q3 43, a variant of its full-frame fixed lens compact with a 43mm F2.0 normal lens. We've had the chance to use and test it, to produce an in-depth review.