ive used a bunch of projection adapters. the issues are:
you have to focus both lenses. but once you learn to do this fast and tack sharp you will be a cheetah with your sphericals.
what is the min focal dist of the adapter? some as low as 8ft. some only 18ft
will you need to add diopter to drop min fd? see above
what is the min useable focal length of the camera lens in conjunction with the adapter without vignetting? depends on the size and design of the adapter. often 40-50mm for avg 16mm gate. little secret... get a doubler. seems to drop the min fl well below half. so if you are 50mm stnd spher thru the anamorphic and you add a doubler i have experienced a drop all the way down to 15mm. not the expected 25mm. (and note this is my direct experience canon and fujinons with built in 2x's but dont yell at me if you spend $400 on a mutar and this doesnt work . this stuff is trial and error) also see next issue
chromatic aberrations form capturing thru all the extra glass? likely. but some add to the look i believe. some are ugly.
i love what ive trained my eyes to see from all the experimenting. if youre looking to spend some quality time with your gear you can def do it in this catagory! its really a matter of what your taste and tolerance can handle. otherwise it becomes clear why even old internally matched anamorphic taking lenses cost a small deficit.
Edited by steve waschka, 18 April 2013 - 10:11 AM.