Found a way to remount a filter glass slug in an adapter that could be useful in many situations.
I have a Rollei Wide that has a Bay IV filter mount. If anyone has ever looked for this size filter, well, rare and expensive is the polite way to put it. There are Bay IV to 49mm adapters readily available on Ebay and such. So I bought one. Installed a 49mm filter on the camera. Nice. Except that I got vignetting in the corners. The stack height of the adapter plus filter was intruding into image circle. Sighting through the back as with a large format lens to check for vignetting, I could see the filter intruding into the image circle. Yuck.
Solution: the 49mm filter has a retaining ring on the front holding the glass in place. And threading to mount another 49mm in front if wanted. Meaning that the retaining ring is a 49mm threading. Unscrew the retaining ring. Remove glass. Needed to add little dots of thin foam around the edge of the glass to get it to sit centered in the adapter. Now use the retaining ring from the original filter mount to hold the glass into the Bay IV to 49mm adapter.
Well, this is one way to get a variety of filters for Bayonet cameras like Rolleiflexes. Find a Bay 'X' to 'YYmm' standard filter. Find a YYmm filter that uses a retaining ring on the front. Use that retaining ring on the BayX to YYmm to hold whatever glass filter slug you are looking for in place. So, for example, you can use a Bay II to 52mm adapter and install a variety of recent glass slugs from modern 52mm filters.
I have a Rollei Wide that has a Bay IV filter mount. If anyone has ever looked for this size filter, well, rare and expensive is the polite way to put it. There are Bay IV to 49mm adapters readily available on Ebay and such. So I bought one. Installed a 49mm filter on the camera. Nice. Except that I got vignetting in the corners. The stack height of the adapter plus filter was intruding into image circle. Sighting through the back as with a large format lens to check for vignetting, I could see the filter intruding into the image circle. Yuck.
Solution: the 49mm filter has a retaining ring on the front holding the glass in place. And threading to mount another 49mm in front if wanted. Meaning that the retaining ring is a 49mm threading. Unscrew the retaining ring. Remove glass. Needed to add little dots of thin foam around the edge of the glass to get it to sit centered in the adapter. Now use the retaining ring from the original filter mount to hold the glass into the Bay IV to 49mm adapter.
Well, this is one way to get a variety of filters for Bayonet cameras like Rolleiflexes. Find a Bay 'X' to 'YYmm' standard filter. Find a YYmm filter that uses a retaining ring on the front. Use that retaining ring on the BayX to YYmm to hold whatever glass filter slug you are looking for in place. So, for example, you can use a Bay II to 52mm adapter and install a variety of recent glass slugs from modern 52mm filters.
