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04-28-2010, 07:57 PM   #151
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QuoteOriginally posted by rfortson Quote
One other entry to my "sharpest" list - DA*200. Playing around with it the other day and took a shot of an office mate just to show him what it would do, and you could count the pores on his skin (much like Mark's shot above). Very sharp.
With the Macro-Tak 50mm f4, you can see what is IN the pores!

04-28-2010, 08:49 PM   #152
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QuoteOriginally posted by kerrowdown Quote
You really do need to get one, also get the hood as well, I wrote a review of this lens on the site here singing its praises.
I'm keeping my eyes opened for a "decently priced" A*85/1. After being blown away by the A*135, I know I must get its little brother.
04-28-2010, 08:52 PM   #153
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QuoteOriginally posted by rfortson Quote
One other entry to my "sharpest" list - DA*200. Playing around with it the other day and took a shot of an office mate just to show him what it would do, and you could count the pores on his skin (much like Mark's shot above). Very sharp.
I've got the FA*200, it is a pretty sharp lens now that I've sorted out my previous BF issue.
04-29-2010, 02:35 AM   #154
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QuoteOriginally posted by Marc Sabatella Quote
One thing that surprised me is finding the M28/2.8 noticeable sharper at f/8 than either the M100/2.8 or M135/3.5. Maybe it shouldn't have - I guess it's normal for wider lenses to have better resolutions scores than telephoto lenses.
To the best of my knowledge short telephoto lenses are easiest to make really sharp. I believe it is actually a challenge to get a (retro-focus) wide angle sharp.

The M135/3.5 is from an area where manufacturers still struggled to get telephotos lenses sharp. There is a very nice article "Tests of Classic Pentax Lenses" by Peter Spiro which seems to have disappeared from the web.

It showed the following resolution figures (centre, lines/mm):

M135 mm f/3.5 50
M200 mm f/4 44
A300 mm f/4 45

Compare this to the fast fifties
K50 mm f/1.4 73
50 mm f/1.2 64

FWIW, the sharpest lens I own is the Sigma 70/2.8 EX Macro. Amazing wide open performance. I often find myself tempted to zoom in more, even when I'm at 100%. The 100% views really look as if you still had some way to go to get the standard slight mushiness of 100% views.

04-29-2010, 03:35 AM   #155
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QuoteOriginally posted by Class A Quote
To the best of my knowledge short telephoto lenses are easiest to make really sharp. I believe it is actually a challenge to get a (retro-focus) wide angle sharp.
The M135/3.5 is from an area where manufacturers still struggled to get telephotos lenses sharp. There is a very nice article "Tests of Classic Pentax Lenses" by Peter Spiro which seems to have disappeared from the web.
It showed the following resolution figures (centre, lines/mm):
M135 mm f/3.5 50
M200 mm f/4 44
A300 mm f/4 45
Compare this to the fast fifties
K50 mm f/1.4 73
50 mm f/1.2 64
FWIW, the sharpest lens I own is the Sigma 70/2.8 EX Macro. Amazing wide open performance. I often find myself tempted to zoom in more, even when I'm at 100%. The 100% views really look as if you still had some way to go to get the standard slight mushiness of 100% views.
If you look at resolution tables the highest ratings are usually in the 30-50mm range.
However, the perceived sharpness is a different story. With a telephoto lens you often take close-ups and/or bokeh-shots. With the corners in the bokeh and larger (uniform) objects/surfaces you don't need die hard resolution.

It is the same with ISO. When I shoot a real close up portrait I can use ISO 800 with my K10d without problems. However, when shooting a huge crowd of people ISO 800 will cause problems because everything is smaller in the picture (details) ....and the noise kills small details.

I tested my K 135mm F2.5 on a concert a few weeks ago. In the first half of the concert I sat close to the stage shooting half body portraits. The pics were tack sharp, better than I ever got with the M 135mm. At the second half of the concert I moved further away from the stage trying to capture the whole brass band (approx 20 musicians) and the result was acceptable but nothing more. So, in order to get the best results I should have moved closer to the stage and used a high resolution wideangle/normal lens such as the K35 or K28 when capturing the whole brass band.

Kind regards
.lars

Last edited by Recercare; 04-29-2010 at 03:52 AM.
04-29-2010, 08:31 AM   #156
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QuoteOriginally posted by Recercare Quote
in order to get the best results I should have moved closer to the stage and used a high resolution wideangle/normal lens such as the K35 or K28 when capturing the whole brass band.

Kind regards
.lars

these lenses have some really excellent resolution. I tried shooting a playing band with the K28 in lowlight and cropped the image 100%. and I could see the resolving power of the lens extend further. sharpness, detail and contrast are well-defined.
04-29-2010, 11:22 AM   #157
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Mine is the Tamron 90mm f/2.8
Although i picked up a clean Micro-Tak 50mm f/4 ... and from what i keep hearing ... it's damn sharp as well. I need to get it out and have a go.
04-29-2010, 11:53 PM   #158
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FA35
Heres a 100% crop shot wide open
straight out the camera

see below


Last edited by rustynail925; 04-29-2010 at 11:59 PM.
04-29-2010, 11:58 PM   #159
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04-30-2010, 01:01 AM   #160
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Hands-down the FA* 300/2.8, by a great big margin. After that, it's either the 85mm or 200mm macro.

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04-30-2010, 01:17 AM   #161
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QuoteOriginally posted by photogerald Quote
I'll have to cast my vote for the A*135/1.8 (I'm not fortunate enough to also own the A*85). It is incredibly sharp at f1.8.
I had also mentioned the FA*200 but the A*135 is definitely the sharper of the two. In fact, an upsampled crop of the A*135 almost matches the same shot taken with the FA*200 for resolved details (click image to enlarge).

FA*200 @ f2.8 on the left, A*135 @ f1.8 on the right.

04-30-2010, 01:56 AM   #162
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QuoteOriginally posted by photogerald Quote
I had also mentioned the FA*200 but the A*135 is definitely the sharper of the two. In fact, an upsampled crop of the A*135 almost matches the same shot taken with the FA*200 for resolved details (click image to enlarge).

FA*200 @ f2.8 on the left, A*135 @ f1.8 on the right.

Hmmm....for me the FA*200 looks sharper than the A*135.

although the A*135 doesn't look that bad either. but for the price, I think I would rather go for the FA*200.
04-30-2010, 02:43 AM   #163
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QuoteOriginally posted by Pentaxor Quote
Hmmm....for me the FA*200 looks sharper than the A*135.

although the A*135 doesn't look that bad either. but for the price, I think I would rather go for the FA*200.
Yes, the FA*200 crop does look sharper but here both shots were taken at the same subject distance. ie- the FA*200 had a 1.45x magnification advantage.

Had I compensated for the focal length difference (by moving closer with the A*135), the A*135 crop would've looked much better.

The fact that the A*135 comes out looking so close to the FA*200 in this test, despite the magnification disadvantage, says a lot about the A*135 I think.
04-30-2010, 04:15 AM   #164
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A toss up between the Ltd 70mm and Ltd 40mm lenses.
04-30-2010, 11:17 AM   #165
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you guys are gonna laugh but I have an old Mamiya Sekor 55/1.4 that is sharp as a razor even wide open.
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