Some of the Metrogon filters appear to be metal sputtered through a mask.
Some of the Metrogon filters appear to be metal sputtered through a mask.
Since Jac brought it up, yes I have a CF for the Metrogon.
It flared a lot even in diffuse light. I cleaned it as much as I could, so it wasn't dirty as far as I could tell. I stopped using it (recently shot some 8x10 slides with the Metrogon even and the fall-off was not noticeable in that situation...but YMMV depending on the photo).
It was also colored so no good for color work but great for b&w! If it didn't flare anyway.
As for the original question, it might be best to use the "intended" CF but a CF designed for a similar lens or FOV with the right size/threads pretty much should work a-ok. I wouldn't hesitate to use my Schneider 3B on my Rodenstock 90mm if need be, because I have it already and it fits the same.
If your goal is to photograph a blank grey wall with perfect even density throughout the entire image with a wide-angle, get the exact CF specified by the manufacturer .
Interesting. The manufacturers don't quite make this claim. And their specs don't support it. For example, at the edge of its field a 35/4.5 Apo Grandy is down four stops from the center @ f/8. With a two stop center filter, the difference between center and edge will be reduced to two stops.
I wish someone could give some ideas about constructing a center filter... metal sputtering is not a thing that i easely do...
well i will give a chance to smoking...
Thanks for alll the answers and knowledge
Not to be a complete idiot or anything, but why do you want to make a CF? Do you have an extreme wide angle lens that no existing CF will fit? Are you poor or broke?
A proposito de metal sputtering, the Metrogon CF has a pattern of small dots, closely spaced near the center, farther apart away from the center. Are you acquainted with silk screen printing?
I like doing things... and a challenge is a good thing!!! i´m a teacher and research is a nice thing!!!
CF´s are expensive and maybe people want to have a viable way to make their own...
silk screening can be a bit coarse... but since it´s so close to the lens...
Splattered mud or bugs on a windshield? I think that idea has already been tested a few billion times.
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