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11-13-2012, 02:50 PM   #1
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Older lenses on a K-30

I've just switched over to Pentax, partly due to compact size of the system, and partly due to the ability to use some older manual focus lenses with SR on a newer, ergonomically superior body.

My question is kind of nit-picky, but I'm curious to know whether aperture info will be saved into the EXIF info for lenses in each series (ie, K-series? M-Series? A-series?). I'm willing to put up with idiosyncrasies, but I'm a perfectionist nerd, and blanks in the EXIF will probably bug me after a while.

Thanks!
JCD

11-13-2012, 02:55 PM   #2
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Pentax K-Mount Lenses Explained: The differences between various Pentax lens series

Screw mount, K & M lenses do not save aperture data. A series lenses work just like an autofocus lens without the autofocus. That is the main reason A series lenses command a premium over KM lenses.

The "crippled" K mount has no aperture coupling, therefore the camera does not know what the aperture is set to. That is why you have to use step down metering with KM lenses.
11-13-2012, 03:06 PM   #3
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For the A series lenses, will it record aperture info even if the aperture ring is set to something other than "A"?
11-13-2012, 03:07 PM   #4
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QuoteOriginally posted by jcdoss Quote
For the A series lenses, will it record aperture info even if the aperture ring is set to something other than "A"?
No, it only knows what the aperture is if the ring is on A.

11-13-2012, 03:08 PM   #5
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QuoteOriginally posted by jcdoss Quote
For the A series lenses, will it record aperture info even if the aperture ring is set to something other than "A"?
No. If the lens is not set to A it will be a KM lens as far as the camera is concerned.
11-13-2012, 03:27 PM   #6
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You can always edit the EXIF data and add all the info manually
11-13-2012, 03:29 PM   #7
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QuoteOriginally posted by demp10 Quote
You can always edit the EXIF data and add all the info manually
Which means going back to the old film days and writing everything down while you do it.
11-13-2012, 03:37 PM   #8
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QuoteOriginally posted by elliott Quote
Which means going back to the old film days and writing everything down while you do it.
Exactly. Poo! I'll have to shop carefully. Thanks for the info, everyone!

11-13-2012, 03:45 PM   #9
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QuoteOriginally posted by jcdoss Quote
Exactly. Poo! I'll have to shop carefully.
Don't rule out all of the non-A glass, you'd be missing out on some really good stuff, like a lot of the awesome K series glass that is better than the M or A glass that came after it. You'd also be ruling out all of the Takumars and the other great M42 stuff out there. It isn't much of an inconvenience, especially if you're willing to shoot with manual focus stuff anyway, you're not going for speed.
11-13-2012, 03:48 PM   #10
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QuoteOriginally posted by demp10 Quote
You can always edit the EXIF data and add all the info manually
How?
11-13-2012, 03:50 PM   #11
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QuoteOriginally posted by kcobain1992 Quote
How?
PhotoME for Window$. ExifTool for Mac & Linux.
11-13-2012, 06:09 PM   #12
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If you enter the focal length and press OK on startup for anti shake it will record which lens you shot with, the only blank in your exif will be aperture.
11-26-2012, 04:27 AM   #13
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edited due to inaccuracy.

Last edited by curlednoodles; 11-29-2012 at 01:39 PM.
11-26-2012, 01:42 PM   #14
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@curlednoodles,
I think (without pressing the green button), this will only works in open aperture mode (Av).
11-26-2012, 01:46 PM   #15
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QuoteOriginally posted by hopsing Quote
@curlednoodles,
I think (without pressing the green button), this will only works in open aperture mode (Av).
Which means a K mount lens will keep the aperture wide open.
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