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35mm/50mm Confusion


8 years 7 months ago #455281 by [email protected]
I am totally flummoxed. I own a Nikon D7000 which I love. But, I can't decide on which lens to chose. Choices: 35mm f/1.8 or the 50mm f/1.8 ( I can't afford the f/1.4)  I have a DX camera, so the crop factor figures in. To further add to the confusion, the 35mm is a DX (so no crop factor) while the 50 is FX. Will somebody set me straight and point me in the right direction? Perhaps then I can get sleep. Thanks..M.
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8 years 7 months ago #455282 by Screamin Scott
You still have to account for the crop factor on a DX lens as it's focal length is the same regardless of the crop factor. Thus the 35mm lens will display the Field of View (FOV) of a 52.5mm lens on an FX body. A 50mm lens will have the FOV of a 75mm lens on a full frame camera. 
Scott Ditzel Photography

www.flickr.com/photos/screaminscott/
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8 years 7 months ago #455286 by [email protected]
But I have a Nikon D7000 which is DX. So a DX lens on a DX camera has no crop factor. Correct?
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8 years 7 months ago #455287 by Screamin Scott
Wrong, the crop factor is a function of the camera, not the lens. There is still an adjustment to the field of view regardless of the lens when using a X camera. All lenses have to have the crop factor figured in, regardless if they are DX or FX. A DX lens simply has a smaller "circle of confusion", which is the projected image. A DX lens on an FX body is still the same focal length, it just projects a smaller circle & the image will vignette as the projected image won't cover the entire FX sensor as it would on a DX camera.
Scott Ditzel Photography

www.flickr.com/photos/screaminscott/
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8 years 7 months ago #455289 by Shadowfixer1
Simple answer is the crop factor is applied no matter if a DX or FX lens. Focal length is focal length. That doesn't change. Like Scott said the field of view inside the camera changes.
www.betterphoto.com/?ramshots
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8 years 7 months ago #455299 by garyrhook
One of the greatest disservices ever perpetrated by the manufacturers on the consumer is that of "crop factor". It does not affect focal length (nothing does). The geometry issue is simply that of the area of the image that is captured by the sensor.

In other words (and I mean this nicely) get over it. It's irrelevant. Figure out what focal length you want, and use it.

That said, neither of those lenses is a portrait lens. So figure out what you want to do.
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8 years 7 months ago #455468 by effron
Let me simplify...I have a D7100 and also both the 35 and 50mm lenses, and the 35mm f1.8 is more useable on the crop sensor cameras. GET THAT ONE!
Why so serious?
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8 years 7 months ago #455499 by [email protected]
"Circle of Confusion" fits me to a T.
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