hiepphotog Offline Upload & Sell: On
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I think I nailed the WB this round .
Xavier: The Biogon G 21 is a tricky, yet lovely little lens. But I think I finally manage to squeeze the most out of this lens . However, I would like to stretch the importance of getting the infinity focus spot-on. When I did the test this morning, my infinity is a little off and I couldn't manage to get a satisfactory result (to be honest, was thinking of selling the lens). However, being curious and quite in love with this lens, I decided to run the test again with infinity adjustment. My G21 was already converted to M-mount with distance scale by Hawk. Using Hawk's M adapter, I got the exact infinity point.
Since this lens's performance so far has been unknown on digital body, I would like to present here the aperture series taken with this. This lens does require a bit more optimization to make it sing. After trial-and-error, here is what I got:
Center
Left - 2.8, right - 4
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https://lh3.googleusercontent.com/-VG2AtzA3IwM/VQ22oqIRIxI/AAAAAAAALh4/_imuWDnzi-w/w1598-h725-no/Center_2_8_4.JPG |
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Left - 5.6, right - 8
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https://lh6.googleusercontent.com/-3gsjAGV3iuM/VQ22o4JZYwI/AAAAAAAALiA/l9Xq7Ajlvig/w1597-h722-no/Center_5_6_8.JPG |
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Left - 8, right - 11
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https://lh4.googleusercontent.com/-lXLI77U9mvo/VQ22odxFRXI/AAAAAAAALiI/P2RU1fiF9OU/w1598-h725-no/Center_8_11.JPG |
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Corner:
Left - 2.8, right - 4
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https://lh6.googleusercontent.com/-ALnj37VKaBE/VQ22piAw-PI/AAAAAAAALiQ/wgQRWEdY7RM/w1598-h727-no/Corner2_8_4.JPG |
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Left - 5.6, right - 8
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https://lh6.googleusercontent.com/-4-IYjZd2II8/VQ22rqFLbMI/AAAAAAAALiY/5EaZuycfIVo/w1597-h725-no/Corner5_6_8.JPG |
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Left - 8, right - 11
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https://lh4.googleusercontent.com/-1Ih6d5ojR8Q/VQ22q1XmTmI/AAAAAAAALig/2N64vSz6HFU/w1598-h724-no/Corner8_11.JPG |
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So to get extremely sharp corner-to-corner, you need f/11. If you shoot at f/8, you have to deal with that soft extreme corners (about 3% of the entire frame). f/5.6 is okay, but certainly f/2.8 and f/4 are totally garbage for any landscape work (who would shoot a landscape at these apertures anyway). Attached below is the full-res rar:
Contax Biogon G 21 Aperture Series
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