If I remember correctly, focus moves by 1/3 of the filter thickness if the filter is on the back. But it doesn't matter if that's right or wrong, because you will focus with the filter in place, and so nothing will move after you've focused. "Other issues"---that's the stuff that starts fights on the web. Some people think that theoretical problems are real ones are exactly the same thing. I recommend you try it yourself, and see if YOU see a difference.
Thanks, but I'd rather just watch:
Large format: http://flickr.com/michaeldarnton
Mostly 35mm: http://flickr.com/mdarnton
You want digital, color, etc?: http://www.flickr.com/photos/stradofear
I am thinking that if the correction is just as good if the lens is mounted in front, I would rather come up with a way to put the filter on the front. Since most of my photo work is done outside, I would like to cover the opening in the shutter. The first attempt will be to rig something up myself to adapt the front opening to 52mm filters.
Well, it has been a while since I first started this thread. After this discussion, a gracious forum member, Charley Ewen, agreed to machine a couple of brass adapters that accept 52mm fliters on the front and screw into the front of the Acme Synchro #3 shutter. A little flat black paint on the inside and a yellow #15 filter on the front and it is good to go! It took me a while to post these on the site, but I thought it would be good to share some photos so you could see how they work. I imagine they are similar to what Keith Fleming described above.
The first photo shows the adapter without the filter. The second shows it with an old 52mm Vivitar #15 filter attached.
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