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Old July 28th, 2005, 06:31 AM   #1
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Ground Glass Info

Hi everyone, I have done a lot of reading about peoples plans on how to make mini35s and it's a pretty simple idea from what I understand, the only problem is that this "ground glass" that everyone is trying to make.

I read that you can do it by sanding down a UV filter with sandpaper or you can use wax, but why can't you just buy a focusing screen and use it? If you can could you not just buy a cheap one like the one at the following link: http://www.bhphotovideo.com/bnh/cont...ughType=search

I know it's a stupid question and I'll probably get bashed but someone please enlighten me.

Thanks,
Cory Cone
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Old July 28th, 2005, 09:48 AM   #2
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Hi Cory!

The big reason not to use a focusing screen from a camera is because most of them have markings...and if you find one without markings (like the one posted), it still likely won't have a fine enough grain.

The first couple of ground glasses I made were from UV filters. Then I learned I could use 50mm glass from 99 cent picture frames just as well...and I saved a bunch of money.

The best results I've had were with microcrystalline wax: http://70.147.193.182/mwtest

...however it is a bit more tricky than glass grinding.


I still think the best solution, if you have the money & equipment, is a moving ground glass - You'd get as much light as possible and grain wouldn't be an issue. I've made some very low-tech attempts at this, but nothing near as good as what Les Dit, Dan D., Ori, and some of the others have done.

Hope this helps!
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Old July 28th, 2005, 03:32 PM   #3
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Is that a field lens sitting in front of your GG Frank? Or just a condenser? (the rounded rectangular glass piece)
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Old July 28th, 2005, 11:25 PM   #4
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the screen could work if you vibrated it.
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Old July 29th, 2005, 12:29 AM   #5
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Thanks for the info guys.

So the GG does not need to be perfect if you can vibrate it? Or does it need to be spun?
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Old July 30th, 2005, 08:21 PM   #6
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One more question, when I'm sanding the glass with 600 grit, I read somewhere to use oil, should I use any oil? If so what kind? If not do I just sand with straight sand paper?

Thanks
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