Look carefully at the black area on the ring that is the 'pointer'. Try scraping there with a knife to see if there is a screw hidden behind the paint.
Look carefully at the black area on the ring that is the 'pointer'. Try scraping there with a knife to see if there is a screw hidden behind the paint.
What about focusing as wide open as you can get the iris
take off front element and slip in desired homemade aperture then screw back in
Like a waterhouse stop but without all the damage/potential for
Or instead of unscrewing element and having minor issues with dust
tape an aperture to the front of the lens
maybe results in less sharp photos that way but?
Free
I knew putting the aperture in front would degrade sharpness or not help with aberrations
whatever
but I don't know what exactly it does ..especially with complex lenses
I've only done this with simple achromats/doublet/meniscus types
Seems long focal length lenses don't matter as much, either
simple lenses have been sold this way and convertible lenses end up being used this way but that is a long focal length if not always a simple achromat doublet group
People say it cuts off angle of view or whatever if done with complex lenses and just doesn't work
?
I gave a quick test with an artar and works as aperture
if it cuts off field or limits movements or increases aberrations ..
I'm just saying since it seems I killed the thread
Not entirely on the subject but regarding paper aperture blades
To me they seem to be a thicker paper coated with glue
Any chance? I apply glue to homemade lens caps/shades after painting as it cuts down on the gloss of even flat paint and also provides a scratch resistant coating
Posting Permissions
Reply With Quote
Bookmarks