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06-10-2008, 01:30 AM   #1
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what focal length entry for SMC-M 70-200 ?

Hello everyone. I have a K10D and very happy with it. I like to use old lenses. With prime lenses it is ok to enter the focal length to the body but what focal length should I enter for my Pentax SMC-M 70-200 to have SR work properly? For example an average value like 135, the lowest, highest? Thanks for the answers.

06-10-2008, 01:42 AM   #2
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The lowest value (70 in this case) is best in these cases. If you used 135 for SR, and 70mm on the lens, it would cause the camera to over-compensate, blurring your images even in broad daylight.

I'm speaking from experience.
06-10-2008, 01:49 AM   #3
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I usually put it in the higher end, because thats where I usually am on zooms. But the best thing is to stay in the light and turn it off .
06-10-2008, 02:06 AM   #4
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QuoteOriginally posted by Zewrak Quote
I usually put it in the higher end, because thats where I usually am on zooms. But the best thing is to stay in the light and turn it off .
Definitely agree with you on the last part. But what if you have to zoom out quickly and take that all-important shot? Blurry pics 'R' us.

06-10-2008, 02:34 AM   #5
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Thanks to you both for your fast and helpfull replies.


QuoteOriginally posted by ftpaddict Quote
The lowest value (70 in this case) is best in these cases. If you used 135 for SR, and 70mm on the lens, it would cause the camera to over-compensate, blurring your images even in broad daylight.

I'm speaking from experience.
So as I understand it will be usable for me to enter the focal value generally which I use, it is ok. And to close SR is always the solution that is ok too. Let me ask, if I enter a high value (lets say 200 i.e.) so it will over compansate on below values. Is it vice versa? If I enter 70, will it over compansate on 200 too? Or will the SR effect weaker than it is on 70mm?
06-10-2008, 03:06 AM   #6
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I also enter the wide end 35mm for my 35-70mm or 70 for my 70-210mm, 77 for my 80-200mm as it helps some even if you zoom to the long end but as was said if the sr is set for longer than you are using it can cause blur. This is useful for trying to remember what lens you used later when you look at the exif If I know I need it long It can be changed in a few seconds in the menu.
06-10-2008, 03:35 AM   #7
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Thank you all for your detailed expalantions.
06-10-2008, 06:33 AM   #8
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A few weeks ago, I took 250 comparison shots to try to determine the best setting for my 70-210. Unfortunately, I haven't had time to really look at the pics yet to determine which ones are acceptably sharp. (But hey, if anyone feels like doing the dirty work, have at.)

06-10-2008, 04:06 PM   #9
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QuoteOriginally posted by Tayfun Quote
So as I understand it will be usable for me to enter the focal value generally which I use, it is ok. And to close SR is always the solution that is ok too. Let me ask, if I enter a high value (lets say 200 i.e.) so it will over compansate on below values. Is it vice versa? If I enter 70, will it over compansate on 200 too? Or will the SR effect weaker than it is on 70mm?
If you chose a low value for the SR it won't over-compensate, just be not quite as effective for much longer focal lengthes.
06-10-2008, 09:51 PM   #10
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QuoteOriginally posted by joefru Quote
A few weeks ago, I took 250 comparison shots to try to determine the best setting for my 70-210. Unfortunately, I haven't had time to really look at the pics yet to determine which ones are acceptably sharp. (But hey, if anyone feels like doing the dirty work, have at.)



Thanks for the explanation Ben.
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