35mm Adapter Static Aldu35

[Alain Dumais]

The problem is you canot only use a lens ,you need a pentaprism.

http://www.zygo.com/appnotes/zms0017/zms0017.pdf

[Taylor Moore]

Posted Here:

http://www.moorefilms.com/aldu35.htm

[Alain Dumais]

Thank you Taylor
Now Image are available here
for Aldu35

http://www.moorefilms.com/aldu35.htm



Alain
http://www.kheops-tech.com/~ad3d/

[Frank Ladner]

Noah: I ordered my aluminum oxide from Scientific Instrument Services, Inc
(http://www.sisweb.com/ms/sis/alumoxid.htm)


There's also another place called Ted Pella, Inc
(http://www.tedpella.com/material_html/grind.htm)


I went with SIS because they had the option to order a small (4oz) bottle. ($10.50 each)

[Noah Posnick]

Thanks, but the problem is that Scientific Intrument Services, Inc only sells 600 grit and the other place, Ted Pella, Inc only sells in larger, unnecesarry quantities and they don't sell in the larger 120 or so grit

[Frank Ladner]

Noah: That's true. I asked the representative at SIS over the phone, and they only have 600 grit. I'm hoping to just use 600 grit, instead of using bigger sizes and moving down. I know this will be a lot of extra grinding, but I'm willing to give it a try.

If I need to, I'll get a 1lb container of 400 or 320 from Ted Pella.

[Alain Dumais]

Try here this is where I buy it.

http://www.microid.com/maison.htm

I can't imagine you canot find this in New-York.

[Frank Ladner]

Alain: It appears that your device is fixed to work with that specific 35mm lens. Have you thought about building one that is adjustable, to accomodate lenses with different flange focal lengths?

[Todd Birmingham]

Alain--

Couple of things:

Could you post a close-up detail pic of the finished GG or is it "stuck?"

Do you think a electric grinder would work?:

http://www.amazon.com/exec/obidos/tg...&s=hi&n=228013

If so, they have grinding wheel attachments for this tool that comes in the lower grit aluminum oxide the project calls for. Perhaps this would cut down on some of the labor??

[Todd Birmingham]

Here's another place I found 120 and 240 grit Aluminum Oxide:

http://www.caswellplating.com/buffs/aws750.htm

It's brown though. Is there a difference between brown and white?

1 pound is $3.50. Cheapest I've seen by far.

[Alain Dumais]

I really don't know.
I haven't try this . The guy's at the telescope store tell me that the glass for microscope that need really precise grinding or for there photographique need are Hand made. Maybe you can start whit this for the first step but the first step is the shortest one,
forget about that for the rest, (I think) So your not gone a save time but I tell you again it's not that hard.

When I was at the store ,and the guy's explaine me how to do it ,I was a bit sceptic but when I start doing it I can't stop until it's done.

Alain

[Alain Dumais]

----Could you post a close-up detail pic of the finished GG----

http://www.kheops-tech.com/~ad3d/Aldu35.jpg

[Brett Erskine]

Heres a test chart for the optical quality of all of our mini35 designs. Any promising designs should be put to this test to know for sure that its working as well as it can.

It tests for:
1)chroma aberration
2)barrel distortion
3)how much grain is apparent from the ground glass

How does it work?

Step 1: Print out the picture of the test chart on high quality glossy photo paper at 300dpi. You'll find a link at:
http://www.cinematographerreels.com/mini35info.htm

Step 2: Measure the image after it prints out. It should measure 24mm x 18mm.

Step 3: Videotape the image with only the diopter lens your using in front of your camera (diopters are also known as macros, closeup filters, achromats and apochromats) and make sure its in focus and that you are filling the viewfinder edge to edge with the image.

Step 4: Post a frame grab from your video here at full resolution (720x480). If you have straight lines in your frame grab and no color blurring then your mini35 system has pasted the test.

Now if you want to check for how much grain can be seen in your ground glass repeat the first 4 steps with your mini35 system put all together including your 35mm lens.

These tests will check, with precision, everything but resolution. You'll need to shoot a professional resolution chart for that. Post that too if you have frame grabs.

Link to mini35 test chart:
http://www.cinematographerreels.com/mini35info.htm

Brett Erskine
Director of Photography
Premiere Visions
1761 W. La Palma Ave., Suite #302
Anaheim, CA 92801
www.CinematographerReels.com
BErskine@CinematographerReels.com

[Jim Lafferty]

Any reason why the diffusers previously linked to won't work for this project? Aren't they just pre-ground glass?

Here's what I'm talking about...

Is it true that the grind, or frost, needs to measure in at 3 microns?

- jim

[Richard Mellor]

http://www.partsexpress.com/pe/showd...ID=16106&DID=7

hi everyone wonder If this might be of help .
alain ...that is the most beautiful ground glass I have seen.
my test with the glass etching paste seems to cause what
look like pit,s and alain do you have a method for protecting the other side of the glass when you are grinding it. thanks for all the great photos