seanc Posted June 3, 2015 Share Posted June 3, 2015 I don't know why it has been so difficult to find an answer to this... maybe I just can't find the right combination of search words.1) What is the f= number etched into the lens housing? I've seen f=65mm, 2.65in... or f=75mm, 2.95in. What is that f= number referring to?2) Does a larger number equate to a larger rear opening, and a small number equate to a smaller rear opening?3) Does the number also determine a larger or smaller size for the front opening?Seems an important bit of information to have when trying to determine what size taking lenses I'll be able to use. Without an Isco in hand, just looking at photos and descriptions on Ebay, it's been impossible to figure out the sizes of different parts of the lens to know what I'll be working with and how other parts of the setup will match up. Link to comment Share on other sites More sharing options...
Julian Posted June 3, 2015 Share Posted June 3, 2015 It's the focal length of the 'normal' lens that is attached to the anamorphic part. It's irrelevant if you want to use the Ultra Star as an anamorphic attachment on your own lenses. Link to comment Share on other sites More sharing options...
Nikkor Posted June 3, 2015 Share Posted June 3, 2015 I have always wondered if the shorter focal length ones can take wider lenses. Mine says 75mm and I have a special 75mm lens that gets so close to the adapter that it doesnt vignette. Link to comment Share on other sites More sharing options...
ken Posted June 3, 2015 Share Posted June 3, 2015 I have always wondered if the shorter focal length ones can take wider lenses. Mine says 75mm and I have a special 75mm lens that gets so close to the adapter that it doesnt vignette.No, all the anamorphic lens part are the same. The focus length is just for different size of screen or movie theater use. Nikkor 1 Link to comment Share on other sites More sharing options...
seanc Posted June 4, 2015 Author Share Posted June 4, 2015 Thanks, everyone. You have unwittingly aided me in making my first anamorphic lens purchase! Mwahahaha! Link to comment Share on other sites More sharing options...
ken Posted June 4, 2015 Share Posted June 4, 2015 Please see pics. the right one with filter thread(non rotating) added. Also many batch of them have no FL mark on anamorphic lens. Nikkor 1 Link to comment Share on other sites More sharing options...
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