Wide angle lenses are substitute for having a full frame sensor?

1 month 3 weeks ago #681250 by Julie Staas
I was reading a blog post on another site I belong too and one of the commenters made the above statement.  I'm sorry, but I don't get how this would have any truth to it.  A wide focal length on any lens will give you a wider field of view.  However that same lens on the full frame camera will give you greater field of view yet.  

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1 month 3 weeks ago - 1 month 3 weeks ago #681257 by Nikon Shooter
Hi Julie,

a lens has properties that are fixed — optical physics that is.
Among its characteristics, the AoV (angle of view) — which,
again, is fixed… did I say I'm talking about prime lenses yet?

On a full frame, a 16, 50, or 300 mm will project what it sees
it front of it through the back — where the sensor is. All will
project a different image because all have other focal length.

On a cropped frame, all the same lenses will project the same
images. Of these images, only the central part will reach the
smaller sensor and be recorded. In fact, the only change is in
that recorded angle of view and no change to the focal length.

Ever!

Light is free… capturing it is not!
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1 month 3 weeks ago #681260 by garyrhook
No, they are not a substitute. They add choices/options/possibilities, but it's not the same thing.

And FWIW, the angle of view is not fixed. The overall geometry depends upon the sensor size and focal length. That's why the value changes when you put the same lens on two different bodies.


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1 month 3 weeks ago #681300 by Piechura
They're a substitute in the sense that they enable you to get the same field of view. For example, if you've got a micro four-thirds sensor, you buy half the focal length as you would on a full frame. You'll notice that the wide angle zoom from Olympus and Panasonic are 7-14mm, which is wider than you would get on a full frame (typically 16-35mm, 15-35mm or 14-24mm depending on the manufacturer). That isn't to say the results will be exactly the same in all other aspects, but you should be able to fit in the same amount of the scene. Once you get into the more specialist lenses, I think full frame lenses go wider (Canon do an 8-15mm full frame, for example) but in the more traditional focal lengths, there is usually an equivalent.

But yeah, if you're talking about using the same lens on two different cameras, then the full frame will always be wider.


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1 month 2 weeks ago #681396 by fmw
GaryHook is right.  The angle of view depends on sensor size as well as the focal length.  We will use an example.  If we make images to compare of a subject with a 50mm lens on your full frame Nikon and a 35mm lens on my APS-C Fuji and then project or print the images they will have a very similar angle of view corner to corner.  The 35 has a "normal" angle of view on my camera and the 50 has "normal" angle of view on yours.  The reason is he sensor size.

What will not be the same are all the things that relate to focal length such as depth of field.  The 50mm lens on my Fuji would produce a telephoto angle of view (because my sensor would crop the image circle) on my print but would have the same depth of field it had on your camera assuming the same aperture.

I'm ignoring the cropping and image circle coverage.  I'm assuming both lenses will work on either camera.  I'm just explaining optics, not equipment.


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