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The Effects of ISO 3200
Lens: Pentax-M 100mm f:2.8 Camera: K-50 ISO: 3200 Shutter Speed: 1/500s Aperture: F9.5 
Posted By: Dewman, 08-03-2017, 07:02 AM

I've always liked the contrast of brilliant greens against a very dark background and decided to try bringing out the grain of this subject by using an ISO of 3200. I was pleased with the results. Every time I use this old Pentax-M 100mm lens, I'm amazed at the quality images it produces. I was lucky enough to find it locally on a Craig's List ad. So very sharp.... as long as I can nail the focus. But due to diabetes, it's becoming more difficult as time passes.

Last edited by Dewman; 01-10-2018 at 08:37 PM.
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08-03-2017, 07:33 AM   #2
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I like the results very much.
08-04-2017, 01:15 AM   #3
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Very nice shot. Keep at it! A tripod and/or live view might help with focussing.

I have some issues with prescription classes and wide apertures, especially at short ranges. When taking portraits with a 50mm I have to be really careful to get it right.

I have the same lens, but I have to confess that I don't use it very much. Your picture has inspired me to to take it out again.

BTW, the EXIF show this nugget of information:

Camera Make
OLYMPUS IMAGING CORP.
Camera Model
PENTAX K-50

08-04-2017, 06:51 AM   #4
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QuoteOriginally posted by Wasp Quote
Very nice shot. Keep at it! A tripod and/or live view might help with focussing.

I have some issues with prescription classes and wide apertures, especially at short ranges. When taking portraits with a 50mm I have to be really careful to get it right.

I have the same lens, but I have to confess that I don't use it very much. Your picture has inspired me to to take it out again.

BTW, the EXIF show this nugget of information:

Camera Make
OLYMPUS IMAGING CORP.
Camera Model
PENTAX K-50


Thanks for the comments. I use a monopod or tripod for literally everything I shoot. Like you, I don't use the 100mm manual lens very often, but just for old times sake, I'll occasionally renew my friendship with it. And, yes, I get asked about the EXIF info once in a while. My favorite editing program came with a little P&S Olympus camera, thus the somewhat misleading info. Although I have Photoshop, Lightroom and Paintshop, I prefer the little cheapo program over the rest for 90% of my editing. A great little program.


Here's another shot showing the sharpness capable with this fine little lens.


Last edited by Dewman; 01-10-2018 at 08:37 PM.
08-08-2017, 03:31 AM   #5
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Boom ! nailed it ... ( ISO 3200 = Wow )
08-08-2017, 04:54 AM   #6
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Well, you certainly nailed the focus on both shots. Interesting, I didn't realize the Olympus Imaging Corp made the Pentax K-50, as indicated in the EXIF.
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