I use standard tray cleaning dichromate/acid solution that I make up from an old formula. If you are doing a one-time quick cleaning, then lye is acceptable, but don't leave it in the solution overly long.
Originally Posted by John Jarosz
Some glasses are not subject to this, for example the good labware glass we use is immune to this for the most part (pyrex), but window glass is very prone to the problem. I use a glass bottle for my 5% sodium hydroxide solution and the glass is quite milky on this cheaper glass dropper.
As for images remaining behind, I never heard of it, but I guess it is possible if sliver metal gets depositied on the glass somehow. Maybe that is why old-timers use the acid dichromate method, as it removes silver deposits that the alkali will not deal with.
If you need ground glass for your camera though, Dave Parker from Satinsnow will custom make you one for a very reasonable price.
I tried SS but Dave says he cannot get acceptable glass this thin.
Originally Posted by donbga
I am raised with using millimeters, so I had to convert 0.065" so get an idea of how thick that was (1.651 mm). So, armed with my micrometer I went out to the bench and had a look. The leftover groundglass is 2.35 mm, but the glass I had from some abandoned picture frame is 1.85 mm (0.072 inch), so I don't think you should give up just yet on finding some glass.
BTW, I am not really into Hasselblad stuff, but am I right in that is two parts - one plastic fresnel and one ground glass part? For what model? Maybe I can source it over here.
You are correct, there are two parts: a typical groundglass and a fresnel.
Originally Posted by Jerevan
It is called "Focusing Screen Adapter" Cat # 41025. Designed for the SWC, but it will fit on the rear of any Hasselblad.
There is one at B&H for $69, with that part number.
Actually not a bad price. That may be the cheapest solution. Thanks
The thinnest glass I can get that is acceptable for grinding is 1.94mm thick, most picture frame glass actually is not flat and has waves in it, using picture frame glass, unless the high dollar museum glass is not normally acceptable in this type of application, believe me, if it is glass, we have looked at it and tried to see how it would turn out...that is why I have the glass made for my application, but if I were to do a run of glass for one project like this, the cost factor would be hugh and not economically feasable, it sounds like the B&H route might be your best bet.