Carsten, Optar is a Graflex Inc. trade name. Graflex bought lenses in, had them engraved (by the manufacturer) with Graflex' names. Most Optars were made by Wollensak.
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Carsten, Optar is a Graflex Inc. trade name. Graflex bought lenses in, had them engraved (by the manufacturer) with Graflex' names. Most Optars were made by Wollensak.
My error, Randy. I don't know why, but I thought -- wrongly -- that you have a 10 incher. Apologies for the mistake.
At full aperture, your 15 incher's entrance pupil should be 68 mm. The...
Sorry, I don't think that will work. I just took a look at a couple of Betax shutters on eBay. They all have non-linear aperture scales, i.e., the larger the number the shorter the distance between...
Randy, open the shutter's diaphragm as wide as it will go. If you can see the blades, stop, this procedure won't work.
If the blades can't be seen, slowly stop down until they're just visible. ...