| Author | Message | ||
     Marco Rating: N/A |
I have run accross an inability to adujst the focus on an old Agfa Jsolette Folder with an Apotar F4.5 lens (3 element). When I try to adjust infinity focus (using a 300mm on a SLR at infinity and viewing through it at the folder's open shutter, to a backlit target in it's film plane) by rotating the front element, the image in my "collimator" never changes in sharpness. It is slightly unsharp no matter how much that front element turns! I have used this method successfully many times before with different cameras and the transition from sharp to de-focused, is very quick once that front element start to rotate. I have also flipped the rear element's position but without success. It almost appears as if someone mounted a unit focusing lens into a camera that was desinged for front cell focusing! Any ideas were I am going wrong? Thanks |