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By the way, it is amazing how tight the element retaining ring was. I did not see any sign of loctite or varnish in the threads and it unscrewed with a gradually reducing torque as I would expect...

Hi all,
I have a Schneider Symmar 150mm ƒ5.6/256mm ƒ12 convertible that has haze on the internal surfaces of the rear element. I made a spanner to pull the retaining ring so now I can clean it, but...

Hi all,
Can anyone shed any light on the differences between the "Basic Photo" edition of "The Negative" (1948) versus "The New Ansel Adams Photography Series" edition of same (1981 and another in...

I've used my Canon S45 as a meter in the past, with good results. When lazy, I just set it to automatic, take a test photo and if it looks good, use the exposure indicated by the camera. When less...

There's a place called American Science and Surplus (sciplus.com) that sells small projection lenses for $5 to $10. I use a 40mm and a 50mm. They are adjustable in the sense that you need to hold it...

Hi all,
I have a Schneider Symmar 150/5.6 convertible with slight haze in the rear element. I used a loupe to look at the lens surfaces, focusing progressively from the element nearest me to that...

There was recently a 5x7 Wollensak Series A Portrait lens for sale on ebay. This lens was listed by the seller as a Petzval. Is this true? The 1907 & 1913 catalog entries for the lens say nothing...

Initially, you called the lens on the rail camera an Ektar, then later an Optar. I'm sure you realize it is an Optar. I have the same lens, a 135mm Optar. Never shoot this wide open. To do so will...

While not truly a proof, I first make an exposure with a digital camera. I get a good view of composition - saving me from a few photos that looked great on ground glass, but did not make it on the...

Hi all,
I recently acquired a Linhof Technika III/5. Seeing that the bellows and body panels are real leather, I would like to know what is suggested to keep the leather in good condition. It came...