scratchy ground glass

[Daniel Skubal]

I had an idea to make your own ground glass:

get one of those mechanical cd cleaners (the hand crank kind) and replace the polishing pad with fine grit sandpaper, and it will evenly scratch the surface of your disc to make it frosted.

 

[chris f]

probably another stupid question, but how sanded down or frosted do you want the gg to be?

 

[Ralph Oshiro]

I thought ground glass was made using chemical etching (hydrochloric acid?).

 

[khmuse]

Some processes use enchants, others use abrasives (contact or propelled). If I remember correctly, nitric acid is more common.

Here is a link that might be of interest:

http://www.etchmaster.com/information_site/is_chemical.htm

 

[tazak]

Try using the mirror from and old makeup compact, they come in a variety of shapes and sizes. It does take a little longer to grind through the mirror backing but the glass is usually high quality.

 

[d4v1dz33]

you guys have seen this before ill bet:

http://www.optosigma.com/miva/merch..._Code=pg211&Category_Code=Filters+&+Apertures

but the problem with it is that the largest glass size they have is 50mm, which im guessing would fit well in a 52mm ring. but that takes all sorts of adapter rings to fit on the 72mm dvx or in my case, 58mm vx2000

 

[j]

There can't be any easy answers...

-j

 

[craigery]

ok, i went to a couple hardware stores and all they had was 600 grit...so i decided to try that out...ive been scratching for who knows how long, and i cant get it anymore condesnsed...is 1000 grit gunna do it better than something as course as 600?

one more question, the correct procedure is to sand it under running water?...and how long should it take before its done?

 

[engr]

May I know which side does the frosted surface of the GG face? The SLR lense or the camcorder?

SLR>spacer>GG>spacer>x7>Camcorder

 

[khmuse]

May I know which side does the frosted surface of the GG face? The SLR lense or the camcorder?

SLR>spacer>GG>spacer>x7>Camcorder

The etched/sanded/frosted side faces toward the projecting lens and away from the camera.

 

[AbracadabraFilms]

off the shelf

off the shelf

I'm sure this has been posted before...but try this glass...it's high quality and low cost...

 

[GenJerDan]

I thought ground glass was made using chemical etching (hydrochloric acid?).

hydrofluoric acid.

 

[d4v1dz33]

will six hundred work well? cause ive gotten the idea that 100 works nearly flawlessly

 

[libneon]

I hear the Nikon D screens are the best for static adapters. If they are so great for static adapters isn't it possible to use one of these as a moving GG? either vibrate or oscillate it inside the adapter? Just a thought.

 

[bikefilms]

I hear the Nikon D screens are the best for static adapters. If they are so great for static adapters isn't it possible to use one of these as a moving GG? either vibrate or oscillate it inside the adapter? Just a thought.

I understand that the grain needs to be courser for a moving gg. Fine grain can't pick up the image as well when it moves.

-a

 

[d4v1dz33]

how big are those nikon focusing screens?