Folks, Are apo ronars 360 mm and 480 mm F 9 lenses useable when focusing to infinity? Or at least far away focusing, say 20 meters? thanks in advanced.
Renee
Folks, Are apo ronars 360 mm and 480 mm F 9 lenses useable when focusing to infinity? Or at least far away focusing, say 20 meters? thanks in advanced.
Renee
They work very well. The Ronars are based on the dialyte design, similar to the Artars. They are symmetrical lenses designed for close work, typically near 1:1. But the corrections of the dialyte design are quite stable over a wide range of image distances. You can use them for infinity subjects and they perform very well indeed. Cheers, DJ
DJ is absolutely right. Apo-Ronars and similar Dialyte constructions (Apo-Artar, Apo-Germinar, Apo-Nikkor) perform quite well at infinity even when corrected for 1:1. Sometimes the manufacturers tweaked the performance towards infinity by changing the cell spacing a little, but even without that they are perfectly useable for long distances. I have used 240mm, 300mm, 360mm, and 600mm Apo-Ronars and all gave excellent results.
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