Contact Me

UV Lens test – focus shift (page 2)

The Coastal Optics 60mm F4 APO has no focus shift from UV to infrared. Hence it can be seen that the UV image is focused nearly at the 0 mark. It isn’t exactly at the 0 mark as the focusing of the visible image was done without any filter on the lens, whereas the UV image was shot with a Baader U filter on the lens, which does shift the focus slightly. Unfortunately I do not have any visible-light filters which are parfocal with the Baader U that I can use.

Coastal Optics 60mm F4 visible
Coastal Optics 60mm F4 visible
Coastal Optics 60mm F4 UV
Coastal Optics 60mm F4 UV (close to 0)
Aico 35mm F3.5 old version visible
Aico 35mm F3.5 old version visible
Aico 35mm F3.5 old version UV
Aico 35mm F3.5 old version UV (back focus about 2)
Aico 35mm F3.5 new version visible
Aico 35mm F3.5 new version visible
Aico 35mm F3.5 new version UV
Aico 35mm F3.5 new version UV (back focus about 2)
Mayfair Crystar 35mm F3.5 visible
Mayfair Crystar 35mm F3.5 visible
Mayfair Crystar 35mm F3.5 UV
Mayfair Crystar 35mm F3.5 UV (front focus between 0.5 and 1)
El-Nikkor 40mm F4 visible
El-Nikkor 40mm F4 visible
El-Nikkor 40mm F4 UV
El-Nikkor 40mm F4 UV (back focus between 1.5 and 2)
El-Nikkor 80mm F5.6 (old) visible
El-Nikkor 80mm F5.6 (old) visible
El-Nikkor 80mm F5.6 (old) UV
El-Nikkor 80mm F5.6 (old) UV (back focus about 0.5 mark)
Kuribayashi 35mm F3.5 visible
Kuribayashi 35mm F3.5 visible
Kuribayashi 35mm F3.5 UV
Kuribayashi 35mm F3.5 UV (front focus about 0.5 mark)
Leica Focotar-II 50mm F4.5 visible
Leica Focotar-II 50mm F4.5 visible
Leica Focotar-II 50mm F4.5 UV
Leica Focotar-II 50mm F4.5 UV (back focus about 1.5 mark)
Noflexar 35mm F3.5 visible
Noflexar 35mm F3.5 visible
Noflexar 35mm F3.5 UV
Noflexar 35mm F3.5 UV (back focus about 1.5 mark)
Prinzgalaxy 35mm F3.5 7xxxx series visible
Prinzgalaxy 35mm F3.5 7xxxx series visible
Prinzgalaxy 35mm F3.5 7xxxx series UV
Prinzgalaxy 35mm F3.5 7xxxx series UV (back focus about 2.5 to 3 mark)
Soligor 35mm F3.5 9xxxxx series visible
Soligor 35mm F3.5 9xxxxx series visible
Soligor 35mm F3.5 9xxxxx series UV
Soligor 35mm F3.5 9xxxxx series UV (about 0 mark)

Summary of focus shift:

There is no focus shift with the Coastal Optics 60mm F4 APO, and also in Soligor 35mm F3.5 9xxxxx series. There is a small amount of front focus with the Kuribayashi and Mayfair Crystar 35mm F3.5 lenses, although both are fairly soft wide open. The Coastal Optics is very sharp wide open. The Soligor 35mm is reasonably sharp @ F4, certainly compared to the rest of the conventional lenses tested.

There is noticeable focus shift in the Aico 35mm F3.5 enlarger lenses (both new and old), El-Nikkor 40mm F4, El-Nikkor 80mm F5.6, Leica Focotar-II 50mm F4.5, Noflexar 35mm F3.5 and Prinzgalaxy 35mm F3.5 7xxxx series. But the enlarger lenses all tend to be fairly sharp at their maximum apertures, which can be useful.

Page 3Page 4, back to Page 1

HTML Snippets Powered By : XYZScripts.com