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Old May 9th, 2007, 11:12 AM   #121
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Join Date: Mar 2005
Location: Los Angeles CA USA
Posts: 507
Originally Posted by Ettore Giraldi View Post
If you are, interested we are working on a solid aluminium box with brushless micromotor (silent, fast and durable), polycarbonate treated GG and a really good self designed Barlow lens, apochromatic (apo) it produces high-contrast edges and brilliant colors, correcting even better light different wavelengths.

The release will take a bit of time anyway, got to be optimal. You will be able to put it in front of every type camera, HD or SD, theoretically this is not a problem to me, i produce one single image, don't matter what electronic eyes you have.
Thank you all!
What happened to you? Isn't this your thread?? LOL!!!

I've built my first adaptor (I call it a DOF Box) according to your and other's incredible posts on this thread, and while I'm happy with the results, they're not as good as yours, so I have many more questions!

Firstly, has anybody been able to confirm or deny that Ettore's 320 grit paper is a universal size? Or is 320 grit in Italy the same as 1200 grit in the USA?

I have been polishing my blessed GG for hours now and have not been able to get entirely rid of the scratch marks on the GG left by the polishing/sanding with 320. It seems better with 1200 but Ettore specifically mentioned not to go finer, hence my question.

I've also found that if you sand in a radial manner (i.e. at 90 degrees to what would be the grooves on a record) then when the glass spins the lines go away easier.

Secondly, a 6v source for a micromotor or a motor out of a 3v CD player works much better than a 3v source. Confirmed that myself so far, but maybe someone has gone further down this road already?

and thirdly, a single achromat, while okay, seems to me to fall off more than a system with a PCx as well. I posted a question on a separate thread about the Redrock M2's internal rear of stills lens PCx design. Is that to combat this problem?

Or is the falloff mainly just a function of the GG's grind?

Comments, Ettore? Anybody?

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Old May 11th, 2007, 10:46 AM   #122
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Join Date: Mar 2005
Location: Los Angeles CA USA
Posts: 507
GG relevations...

Okay, more results for people who are thinking of sanding their own revolving CD GGs.

I've found that the clear CDs in those CD stacks come in many different flavors.

While I was looking through Ettore's site on the smaller adaptor he's built, I realized that his (smaller) GG was cut from the clear portion of a CD case.

This is made of much thicker plastic than the clear CDs I've been choosing to start sanding on thus far.

So last night I went through my batch of clear CDs and picked out a thicker one, and...

well, you can guess the rest.

Much, much smoother. No overtly visible scratches. Relatively little sanding required (as compared to the hours of patient sanding I've been putting in so far).

I thought the thinner, almost flexible ones would be better since they had less mass and would spin flatter.
They possibly do, but also require a far finer grinding technique than I've been able to come up with by hand.

Last night I also tried a little Nivea just to honor this thread, and finally was able to see for myself what you guys have been talking about all along.

Liked it. But it's not necessary, just have the GG spinning very fast and grind it out very smooth., like you've all been saying.

Just waiting for a condenser lens to add behind the GG and I'll be ready to send some decent footage in. It's already pretty good now, just not as outstanding as it could be.

High standards, around here...
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