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Use Film SLR Lens on DSLR
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Jan 23, 2018 14:16:48   #
Screamin Scott Loc: Marshfield Wi, Baltimore Md, now Dallas Ga
 
Crop sensor does not change the magnification of a lens, only the angle of view...
was_a_guru wrote:
So I experimented. With my camera on a tripod took three shots:
1. With my 18-55mm lens set at ~50mm, in A mode - f/5.6, 1/160, ISO 800
2. With the Series E 35mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
3. With the Series E 50mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
(#2 & 3 only worked in M mode.)

I had expected that since the Series E lenses were basically FX lenses that (based on the feedback on got here on my earlier question) the Prime 35mm lens would have an equivalent focal length of ~50mm and thus the object in the picture would be the same size as the one taken with the 18-55mm lens @ 50mm. But to my surprise it was 2/3 the size. The object size in the picture taken with the Prime 50mm lens was the same as the 18-55mm lens @ 50mm.

Now I am confused. See the attachments. ???
So I experimented. With my camera on a tripod took... (show quote)

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Jan 23, 2018 14:32:14   #
rehess Loc: South Bend, Indiana, USA
 
was_a_guru wrote:
So I experimented. With my camera on a tripod took three shots:
1. With my 18-55mm lens set at ~50mm, in A mode - f/5.6, 1/160, ISO 800
2. With the Series E 35mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
3. With the Series E 50mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
(#2 & 3 only worked in M mode.)

I had expected that since the Series E lenses were basically FX lenses that (based on the feedback on got here on my earlier question) the Prime 35mm lens would have an equivalent focal length of ~50mm and thus the object in the picture would be the same size as the one taken with the 18-55mm lens @ 50mm. But to my surprise it was 2/3 the size. The object size in the picture taken with the Prime 50mm lens was the same as the 18-55mm lens @ 50mm.

Now I am confused. See the attachments. ???
So I experimented. With my camera on a tripod took... (show quote)

A 50mm lens is a 50mm lens. Period.
A 35mm lens is a 35mm lens. Period.

Put the 35mm lens on a camera with an APS-C sensor, and the 50mm lens on a camera with a FF sensor, and the two pictures will look very similar. View difference is a function of the sensor difference

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Jan 23, 2018 14:52:24   #
RWR Loc: La Mesa, CA
 
was_a_guru wrote:
So I experimented. With my camera on a tripod took three shots:
1. With my 18-55mm lens set at ~50mm, in A mode - f/5.6, 1/160, ISO 800
2. With the Series E 35mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
3. With the Series E 50mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
(#2 & 3 only worked in M mode.)

I had expected that since the Series E lenses were basically FX lenses that (based on the feedback on got here on my earlier question) the Prime 35mm lens would have an equivalent focal length of ~50mm and thus the object in the picture would be the same size as the one taken with the 18-55mm lens @ 50mm. But to my surprise it was 2/3 the size. The object size in the picture taken with the Prime 50mm lens was the same as the 18-55mm lens @ 50mm.

Now I am confused. See the attachments. ???
So I experimented. With my camera on a tripod took... (show quote)

Why the confusion? The results are exactly as expected. Please read what I wrote earlier:
“The FX equivalent focal length of the 35mm lens will be about 54mm, that of the 50mm lens will be about 77mm on your DX camera.”
Edit: The crop factor applies whether the lens is DX or FX.

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Jan 23, 2018 14:54:19   #
Screamin Scott Loc: Marshfield Wi, Baltimore Md, now Dallas Ga
 
The images he supplied were all taken with a DX format camera
rehess wrote:
A 50mm lens is a 50mm lens. Period.
A 35mm lens is a 35mm lens. Period.

Put the 35mm lens on a camera with an APS-C sensor, and the 50mm lens on a camera with a FF sensor, and the two pictures will look very similar. View difference is a function of the sensor difference

Reply
Jan 23, 2018 17:32:21   #
was_a_guru
 
"The images he supplied were all taken with a DX format camera"

Correct, the picture taken with the 50mm DX looks exactly the same as the picture taken with the 50mm FX (both taken on my DX format camera).
Same is true with 35mm DX & FX lenses.

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Jan 23, 2018 17:48:00   #
rehess Loc: South Bend, Indiana, USA
 
Screamin Scott wrote:
The images he supplied were all taken with a DX format camera

That is correct. He seemed to expect DX lens to behave differently from FX lens, and my point was that behavior depends on sensor.

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Jan 23, 2018 18:37:03   #
was_a_guru
 
A FX sensor is ~24mm x 36 mm. A DX sensor is ~16mm x 24mm. A Xmm FX lens would project an image that fills an FX sensor and overfills a DX sensor on those respective cameras. Thus a FX lens on a DX camera should have the effect of a telephoto of 1.5x.


(Download)

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Jan 23, 2018 19:18:48   #
daeod Loc: Levittown, PA
 
I have and use 3 Nikon AIS manual lenses on my Nikon D90, including 50mm F1.4, 200mm F4 micro, and a 35mm F2.8 perspective lens.

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Jan 23, 2018 19:27:51   #
sloscheider Loc: Minnesota
 
Screamin Scott wrote:
Here is Nikon's compatibility chart...

https://www.nikonusa.com/Images/Learn-Explore/Photography-Techniques/2011/Which-Nikkor-is-Right-for-You/Media/NIKKOR-lens-compatibility-chart.pdf

Great chart, thanks for the link. I didn't know the AF-P entry level lenses aren't terribly compatible will all but the newest batch of bodies.

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Jan 23, 2018 21:30:06   #
adm
 
I use my series E and Nikkor AI-S lenses on my Olympus micro 4/3 camera (with an adapter), which effectively doubles the focal length. For DX/APS, conversion factor is 1.5. You of course are limited to manual focus. On lower level Nikon DSLRs, you are limited to manual exposure mode. I think on D7000 series and up, you may have some degree of automation but I am not positive. On my Olympus, I am limited to manual exposure but I use that mode most of the time anyway. Nikon series E lenses got a bad rap back in the day but are better optically and mechanically than many or most budget lenses made today. The 75 to 150 f 3.5 series E zoom is a real gem.

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Jan 24, 2018 17:05:13   #
JMCPHD Loc: Maine
 
I found a chart on Nikon's web site that lists compatibility of Nikkor lenses with camera bodies. I don't have the link handy but it shouldn't be hard to find. For the D7100 it lists full compatibility with AI, AF, AF-S lenses and limited compatibility with AF-P

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