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05-15-2015, 01:18 AM   #5176
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I've got M28 and M35 f2.8.

IMO they are not stellar design, they do their job nicely but they are not extra sharp, their main atout is the small size....I have no experience with A lenses but a lot of people says the A50 mm f1.2 is sharper than the K50mm f1.2 so it's possible that through the years the SMC coating has been improved.

05-15-2015, 02:11 AM   #5177
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Your comment about the lens hood made me give the subject some thought. I have a Pentax M42 135mm lens that I never use, and it has a metal hood - the screw-on type - and I just tried it on my100mm lens and voila! At first, I thought vignetting might be a problem, but a couple of test shots disproved that.
05-15-2015, 03:14 AM   #5178
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QuoteOriginally posted by Dewman Quote
Your comment about the lens hood made me give the subject some thought. I have a Pentax M42 135mm lens that I never use, and it has a metal hood - the screw-on type - and I just tried it on my100mm lens and voila! At first, I thought vignetting might be a problem, but a couple of test shots disproved that.
I often use the metal Takumar hoods on my later lenses. The one for the Tak 135/2.5 fits my K135/2.5 very nicely and is less delicate than the K-series hood.

K.
05-16-2015, 12:07 PM - 1 Like   #5179
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M135 / 3.5:



05-16-2015, 05:31 PM   #5180
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QuoteOriginally posted by Dewman Quote
Your comment about the lens hood made me give the subject some thought. I have a Pentax M42 135mm lens that I never use, and it has a metal hood - the screw-on type - and I just tried it on my100mm lens and voila! At first, I thought vignetting might be a problem, but a couple of test shots disproved that.
Using a hood for a 135 mm 24x36 on a 100mm with 16x24 sensor works out just about perfect match I would not have expected it to vignette. The vignetting would be outside the frame seen by the APS_C sensor.
05-16-2015, 05:54 PM - 2 Likes   #5181
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M 135mm f3.5 on M Bellows and no post processing:

05-16-2015, 06:46 PM - 1 Like   #5182
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M50 mm f1.4 wide open, Pentax LX AE priority and Portra 160.

05-17-2015, 08:58 AM - 2 Likes   #5183
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I recently acquired the M 75-150 / 4 and this little barrel impressed me:




Last edited by Jorgario; 05-17-2015 at 10:09 AM.
05-17-2015, 10:38 AM   #5184
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QuoteOriginally posted by Jorgario Quote
I recently acquired the M 75-150 / 4 and this little barrel impressed me:




Very nice, Jorgario. I too have one of the 75-150mm lenses and I like it a lot. It will render blues & reds, side by side, very well! Not many lenses will do that with those colors.
05-17-2015, 11:59 AM   #5185
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QuoteOriginally posted by Dewman Quote
Very nice, Jorgario. I too have one of the 75-150mm lenses and I like it a lot. It will render blues & reds, side by side, very well! Not many lenses will do that with those colors.
Thank you very much Dewman !!
05-17-2015, 01:48 PM - 1 Like   #5186
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NEX-5N, M50/1.4 at about f/2.8 - sharp enough?!








05-17-2015, 02:46 PM   #5187
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Sharp enough if you haven't used any post processing to pimp the pics, which I doubt because I noticed most of the people who shoot digital use a lot of stuff to enhance their pics and then show them in various forums to "prove" that for instance a pretty mediocre Leica lens, the Summarit f1.5 that is a low resolution low contrast old glass can produce razor sharp pics wide open.

If I really have to judge the performance of a lens I look at the negatives or at unadulterated scans from positives.re

For instance, here there two pics of the M200 f4, not the sharpest M lens in my kit:



Ok overcast, some haze, pollution, but you see at f8 is not as sharp as a K50 mm f1.4...fair enough, I think that even for architecture it's an interesting pic enough...and you can use the 2 huns also to make interesting shots with its limitations:



A lot of people like this one for instance, despite of the less than ideal lightning and the less than perfect sharpness at f4.
05-17-2015, 02:47 PM   #5188
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Another one from the M 75-150 / 4:



And also from the same lens:


Last edited by Jorgario; 05-17-2015 at 06:07 PM.
05-18-2015, 05:30 AM   #5189
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QuoteOriginally posted by Cuthbert Quote
Sharp enough if you haven't used any post processing to pimp the pics, which I doubt because I noticed most of the people who shoot digital use a lot of stuff to enhance their pics and then show them in various forums to "prove" that for instance a pretty mediocre Leica lens, the Summarit f1.5 that is a low resolution low contrast old glass can produce razor sharp pics wide open.

If I really have to judge the performance of a lens I look at the negatives or at unadulterated scans from positives.

*snip*
Well, there's some truth in that, but there's some truth in its opposite as well.
One lens can have low contrast but good resolving power, and/or can withstand some massive amount of [...] (insert "contrast", "clarity" or "sharpening" here) without the details breaking apart.

Since the end result is always an image "processed to taste from RAW" (that is, if one shoots RAW), then it stands to reason that it's fair to use a converter software to what extent the image will let me.
With some lenses, you don't get much leeway in the first place thus you won't get results as good as with another one.

We have a saying here, which goes more or less like this (translated): "Leave it alone: if it's sh*t, the more you shuffle it, the more it stinks..."
05-18-2015, 09:00 AM   #5190
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QuoteOriginally posted by LensBeginner Quote
We have a saying here, which goes more or less like this (translated): "Leave it alone: if it's sh*t, the more you shuffle it, the more it stinks..."

I couldn't agree more with your somewhat humorous statement! Far too often, I see a fair image ruined by over-zealous application of unsharpmask. Some think that it will sharpen a poorly focused image. 'taint so! It only makes it apparent that the image was processed by an amateur. Personally, if I have an image that isn't sharply focused, I delete it. The only instance where I might keep it would be if it was an important shot and it wasn't possible to re-take it. Even then, I'm embarrassed for it to be seen by eyes other than mine. Sharpness and composition go hand in hand. If it's lacking either of those two elements, it's not worth saving and I cull it with a swift hand!
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