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Concerned at buying the right Lens

In my sights is the Canon EF 17-35mm f4 USM L Lens.

I am convinced that it will fit the two bodies, but, as I suspect the 50d has a crop frame sensor, what will be the issues I will face with this Choice ?

Or, am I wrong and it will work fine ....... !

Thank you very much for your time, input and advice.

Also apologies, if my question seems dumb !! I am an enthusiastic, yet complete amateur photographer.

Nick

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March 22, 2015

http://www.imaging-resource.com/news/2013/09/30/rokinon-14mm-f-2.8-lens-review

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March 22, 2015

When you mount the 17-35 on the 5D (full-frame sensor) body, the lens behaves optically just as it should, as it was designed to, ie, in terms of the circular image the lens is projecting onto the rectangular sensor inside the camera, at any given focal length... The larger, full-frame sensor captures as much of that lens' projected image as possible.

At the 17mm / wide end of that lens, mounted on the 5D, your *horizontal* field of view in a captured image (expressed as an angle of "how wide the scene appears to be") would be about 93 degrees wide. (A pair of human eyes sees somewhere less than 180 degrees wide, horizontally, looking ahead.)

When you go mount that same lens on the 50D (crop-sensor) body, everything still works (autofocus, etc.) -- but the amount of the lens' projected circular image being captured by the now-smaller rectangular sensor inside the body, is naturally, smaller, which effectively means your captured image now appears narrower than before. The resulting captured scene, if the lens were at 17mm on your 50D, would be around 67 degrees wide (horizontally) instead of 93 degrees wide. Nothing but the camera body (and sensor inside) changed...

67 degrees is about the same angle/field of view that a 27mm lens would produce, when you mounted a 27mm lens to a 5D (full-frame) body. You'll hear all of this expressed as the 1.6x crop factor -- meaning, a 17mm lens performs like 17mm (in terms of how wide the image is) only when mounted to a full-frame sensor camera. When placed on a crop-sensor camera, the same 17mm lens will produce a narrower-looking image, which looks like it what you'd capture with a 27mm lens on a full-frame sensor camera... 17mm x 1.6 = 27.2mm.

The 1.6x factor tends to hurt you at wide angles (ie, it is always eliminating some of the lens' wideness -- you buy a wide angle lens to capture wide scenes, right? Yet the ultrawide lenses really aren't ultrawide at all, if mounted to a crop-sensor body!) But then the crop-factor can turn out to help you at long zoom ranges -- if you put a 300mm lens on your 5D, you get the standard angle/field of view designed for that lens; about 7 degrees wide, horizontally... But when you mount that same 300mm lens on the 50D/crop-sensor body, you then get a narrower field of view captured (around 4 degrees), effectively the field of view that, to get on a full-frame sensor 5D, you'd need a big 480mm lens to produce!

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March 23, 2015

A lens to consider would be the Tokina 11-16mm /2.8 DX II
Some points about the Lens:
Aperture Range: f/2.8 to f/22
Designed for Cameras with APS-C Sensors
Internal Focusing AF Motor
One-Touch Focus Clutch Mechanism
Two Aspheric Lens Elements
Two Super-Low Dispersion Lens Elements
Multi-Layer Coating
77mm Filter Thread
Now on the crop factor body this lens will be 17-27mm
This is a professionally sharp lens, I would check this lens out at your camera store.
Best of luck,
Jeff

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March 23, 2015

UB.

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March 24, 2015

You can get special lenses made just for crop-body cameras, that are built to deliver results similar to "normal" lenses designed on a full-frame assumed camera.

For instance. Canon has the 16-35 EF lens. This will mount to Canon's crop-body cameras as well as Canon's full-frame cameras. On a full-frame, it will deliver true 16-35 images / field of view. On a crop-body, it will deliver ~ 25-56mm images / field of view.

However, Canon also makes the 10-22EF-S. EF-S can only safely fit onto a crop-sensor camera body. You might think "that lens must give a staggeringly wide scene, at 10mm -- going into fisheye territory..." -- but, remember the 1.6x crop factor still applies here -- the 10-22EF-S is made specifically to deliver results (on a crop-sensor-camera) of a 16-35 lens (when a 16-35 is mounted on full-frame.) 10mm x 1.6 = 16, 22mm x 1.6 = 35.2.

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March 25, 2015

The Tokina 11-16mm f/2.8 II is really made for crop body cameras:
When used on a DX camera, it gives angles of view similar to what a 17-24mm lens. You have to be careful if you switch
to a full frame camera body- because of the lens you are using now.
Let me know if you have any questions.

Jeff

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March 25, 2015

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December 12, 2023

Your question is not dumb at all! It's great that you're enthusiastic about photography and seeking advice to improve your gear setup.

The Canon EF 17-35mm f4 USM L Lens should indeed fit both your Canon 50D and Canon 5D Mark III bodies. However, you're correct in noting that the 50D has a crop frame sensor, while the 5D Mark III has a full-frame sensor.

When you use the EF 17-35mm lens on your 50D, which has a crop sensor, the effective focal length will be affected by the crop factor. Canon APS-C cameras like the 50D have a crop factor of 1.6x. This means that the lens will effectively behave like a 27-56mm lens (17mm * 1.6 = 27.2mm at the wide end) on your 50D.

While you'll still get a wide-angle perspective, it won't be as wide as it would be on a full-frame camera like the 5D Mark III. However, it's still a versatile lens that can capture a variety of scenes effectively.

If you primarily shoot with the 50D and want a wider field of view, you might consider looking into lenses specifically designed for crop sensor cameras. Otherwise, the EF 17-35mm can still be a valuable addition to your kit for both cameras, providing quality wide-angle shots.

Hope this helps clarify things for you! Happy shooting!

Best regards,
geometry dash unblocked

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January 31, 2024