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caspert79
Joined: 31 Oct 2010
Posts: 2929
Location: The Netherlands
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 Posted: Thu Dec 16, 2021 12:35 pm Post subject: Topcor RE 100/2.8 vs Minolta MDIII 100/2.5 |
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caspert79 wrote:
A test between the two. Note that only a few aspects of both lenses are compared.
Wide open:
 comparison@wideopen by devoscasper, on Flickr
100% crops:
 cropswideopen by devoscasper, on Flickr
Center sharpness is really similar of both lenses. Corner sharpness is better of the Minolta. Note however, that only in the real far corners the Topcor seems to suffer. On the right side of the corner frame, the differences are less pronounced.
@f/4:
 comparison@f4 by devoscasper, on Flickr
100% crops:
 crops@f4 by devoscasper, on Flickr
Center sharpness very comparable. Corner sharpness:same findings as at f/2.8: only in very far corners Topcor seems to suffer. When you look for instance at the text '15 ml' the differences are not huge.
At f/5.6:
 comparison@56 by devoscasper, on Flickr
Crops:
 crops@56 by devoscasper, on Flickr
At f/8:
 comparison@f8 by devoscasper, on Flickr
Crops:
 crops@f8 by devoscasper, on Flickr
Conclusion: very comparable results, except for the very far corners, where the Minolta is better. Real life significance? For me personally close to zero.
Then, I tried to compare fringing, by slightly focusing further and nearer than the subject:
 FringeComparison by devoscasper, on Flickr
I took the pictures at the point of maximum color cast in the viewfinder. This is not exactly at the same point. The Minolta suffers a bit more it seems, at least wide open. |
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lumens pixel
Joined: 27 Feb 2019
Posts: 834
Expire: 2021-06-25
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| Posted: Thu Dec 16, 2021 2:55 pm Post subject: |
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lumens pixel wrote:
Well done.
_________________
Lumens Pixel
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Minolta SR mount: 16 2,8; Sigma SuperWide 24 2,8; 28 2,5; 28 2,8; 28 3,5; 35 2,8; 45 2,0; 50 1,4; 50 1,7; 50 2,0; 58 1,4; 85 2,0; 100 2,5; 100 4 Macro; 135 3,5; 135 2,8; 200 4; RF 250 5,6; 24-35 3,5; 35-70 3,5; 75-150 4; 70-210 4
Canon FD mount: Tokina RMC 17 3,5; 28 2,8; 35 2,8; 50 1,8; 50 3,5 Macro; 55 1,2; 135 3,5; 135 2,5; 200 4,0; 300 5,6; 28-55 3,5 4,5; Tokina SZ-X SD 270; 70-150 4,5; 70-210 f4; 80-200 4L; Tokina SZ-X 845
Tamron Adaptall: 28-80 3,5-4,2 (27A); 70-210 3,8-4 (46A); 60-300 (23A); 90 2,5 (52B); 35-135 3,5-4,5 (40A)
Tamron SP: 20-40 2,7-3,5 (266D) |
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Dejan
Joined: 05 Jan 2021
Posts: 142
Location: Belgrade, Serbia
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| Posted: Thu Dec 16, 2021 4:51 pm Post subject: |
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Dejan wrote:
Very nice comparison indeed. In the center the biggest difference seems to be fewer aberrations with the Minolta, with the corners the story is very different; but something tells me Topcor could be even more interesting portrait lens. With stopped down images Topcor has a (tiniest) bit softer bokeh I think, but probably only due to lower contrast. It could be my imagination, but bokeh highlights seem a bit bigger with Topcor around F5.6, maybe there is a slight real world difference in real F values between lenses. |
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caspert79
Joined: 31 Oct 2010
Posts: 2929
Location: The Netherlands
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| Posted: Thu Dec 16, 2021 5:31 pm Post subject: |
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caspert79 wrote:
The Topcor is slightly longer focal length than the Minolta. |
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Blazer0ne
Joined: 12 Sep 2018
Posts: 836
Expire: 2024-12-07
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| Posted: Thu Dec 16, 2021 5:46 pm Post subject: |
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Blazer0ne wrote:
...
Last edited by Blazer0ne on Tue Feb 22, 2022 6:27 pm; edited 1 time in total |
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caspert79
Joined: 31 Oct 2010
Posts: 2929
Location: The Netherlands
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| Posted: Thu Dec 16, 2021 6:38 pm Post subject: |
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caspert79 wrote:
| Blazer0ne wrote: |
| Is the Minolta a Sonnar like the Topcor you compared? |
I believe it's not. Five lenses in five groups, of which two rear lenses. I guess that can't be a sonnar. |
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jamaeolus
Joined: 19 Mar 2014
Posts: 2932
Location: Eugene
Expire: 2015-08-20
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| Posted: Thu Dec 16, 2021 6:51 pm Post subject: |
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jamaeolus wrote:
 I love these kinds of comparos and realize how much work it is. So, greatly appreciated. I have a couple of copies of the topcor and I think one of the Minolta.
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photos are moments frozen in time |
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caspert79
Joined: 31 Oct 2010
Posts: 2929
Location: The Netherlands
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| Posted: Thu Dec 16, 2021 7:29 pm Post subject: |
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caspert79 wrote:
| jamaeolus wrote: |
| I love these kinds of comparos and realize how much work it is. So, greatly appreciated. I have a couple of copies of the topcor and I think one of the Minolta. |
You’re welcome. I think they’re both great lenses. |
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cbass
Joined: 27 Jul 2019
Posts: 441
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| Posted: Fri Dec 17, 2021 3:47 am Post subject: |
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cbass wrote:
I also see slightly more blur and a softer background on the Topcor. |
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caspert79
Joined: 31 Oct 2010
Posts: 2929
Location: The Netherlands
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| Posted: Fri Dec 17, 2021 5:21 am Post subject: |
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caspert79 wrote:
| cbass wrote: |
| I also see slightly more blur and a softer background on the Topcor. |
Yes, you’re right! |
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