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12-28-2018, 11:19 PM   #1
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Exposure data of AF film lens on DSLR

Please excuse my dumb question, I use 2 old film lenses on my K3, namely the Tamron 28-200mm and the Pentax 80-320mm, I don't see focal length data shown on the playback only aperture, shutter speed and ISO is that normal ?

12-28-2018, 11:32 PM   #2
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Hi lotech, I believe the lenses in question predate the internal chips required to " communicate " with your DSLR.
12-28-2018, 11:48 PM   #3
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Yes, I just thought even film camera will need such information to produce proper exposure especially will flash
12-28-2018, 11:57 PM   #4
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The sensor ( or film ) don't really need/rely on the focal length, just the amount of light reaching either of them. So aperture, shutter speed and ISO ( ASA ) are the only critical information needed for manual operation or AUTO.

12-29-2018, 12:06 AM   #5
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If the lenses are autofocus, you should be getting focal length info. Perhaps cleaning the contacts on the camera mount would help.

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12-29-2018, 12:43 AM   #6
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I've 2 lenses lacking that info but digital lens ok so I guess that's compatibility problem nothing major
12-29-2018, 09:23 AM   #7
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I donít know which vintage your Tamron is, but I had the ĎTamron-inspiredí Pentax 28-200, and it did fine.

Iíd have thought the 80-320 would have also provided FL, since itís a FA lens... Iíd check the contacts and turn the camera off then on again with the lens mounted...

As an addendum, I was told years ago that all Pentax lenses from the F-series on encoded focus distance as well as FL.

-Eric
12-29-2018, 09:41 AM   #8
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The 80-320 should provide focal length to the camera. I don't know about the other lens. Clean the lens mount carefully, I use a bit of isopropal alcohol on a Q-tip or cloth. Then check to make sure all the "bearings" are able to be pressed in and snap back out. One may be stuck and not making contact with the camera mount.

12-29-2018, 10:01 AM   #9
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Just as a a sort of reversal of the original question, I'm assuming that lens identification came in with the MTF optimisation programmed exposure, since there were no data recoded on film 25 years or so back - is this correct?

Last edited by ffking; 12-29-2018 at 10:33 AM.
12-29-2018, 10:17 AM - 1 Like   #10
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Hmmm, Iím not sure if this will help, but from reading your question I wonder if you need to switch info modes on image play back?

On my K-1, the standard information page shows the parameters you mention, but if I hit the info button and switch to a detailed page, I can see the focal length as well as other information. There is also a histogram-view mode on image playback.
12-29-2018, 10:45 AM   #11
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Oh yes you are right, I completely forgot where I saw the detail info., I only recall from memory without actually check with a DA lens, there is not enough room to jam in the full detail on the playback screen, now I can see the FL detail of the shots I shoot with the old lens on the info. page , sorry guys for misleading !
QuoteOriginally posted by ne! Quote
Hmmm, Iím not sure if this will help, but from reading your question I wonder if you need to switch info modes on image play back?

On my K-1, the standard information page shows the parameters you mention, but if I hit the info button and switch to a detailed page, I can see the focal length as well as other information. There is also a histogram-view mode on image playback.
01-01-2019, 06:02 PM   #12
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QuoteOriginally posted by ffking Quote
Just as a a sort of reversal of the original question, I'm assuming that lens identification came in with the MTF optimisation programmed exposure, since there were no data recoded on film 25 years or so back - is this correct?
I'm not sure about lens identification as such, but the F lenses provided the set focal length to the SFX/SF7 cameras - they used it for tweaking the standard program mode (wide, standard or tele as shown on the LCD) and for warning if flash coverage wouldn't cover the whole frame.
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