35mm Adapter Static Aldu35

Alain Dumais · January 27th, 2004, 07:01 PM

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

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

Taylor Moore · January 27th, 2004, 07:07 PM

Posted Here:

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

Alain Dumais · January 27th, 2004, 07:36 PM

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 · January 27th, 2004, 09:03 PM

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 · January 27th, 2004, 09:08 PM

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 · January 27th, 2004, 09:20 PM

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 · January 27th, 2004, 09:20 PM

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 · January 27th, 2004, 09:26 PM

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 · January 27th, 2004, 09:26 PM

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 · January 27th, 2004, 09:42 PM

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 · January 27th, 2004, 10:07 PM

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 · January 27th, 2004, 10:47 PM

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

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

Brett Erskine · January 28th, 2004, 12:00 AM

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 · January 28th, 2004, 12:57 AM

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 · January 28th, 2004, 01:03 AM

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

January 27th, 2004, 07:01 PM	#46
Alain Dumais Regular Crew Join Date: Jan 2004 Location: Montreal Canada Posts: 86	Simon The problem is you canot only use a lens ,you need a pentaprism. http://www.zygo.com/appnotes/zms0017/zms0017.pdf

January 27th, 2004, 07:07 PM	#47
Taylor Moore Regular Crew Join Date: Dec 2003 Location: Canada Posts: 94	ALDU 35 Video and Pictures Posted Here: http://www.moorefilms.com/aldu35.htm

January 27th, 2004, 07:36 PM	#48
Alain Dumais Regular Crew Join Date: Jan 2004 Location: Montreal Canada Posts: 86	Taylor Moore Thank you Taylor Now Image are available here for Aldu35 http://www.moorefilms.com/aldu35.htm Alain http://www.kheops-tech.com/~ad3d/

January 27th, 2004, 09:08 PM	#50
Noah Posnick Regular Crew Join Date: Sep 2003 Location: New York, NY Posts: 64	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 __________________ Noah Posnick http://www.posnick.com

January 27th, 2004, 09:20 PM	#52
Alain Dumais Regular Crew Join Date: Jan 2004 Location: Montreal Canada Posts: 86	Alluminium oxid 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.

January 27th, 2004, 09:03 PM	#49
Frank Ladner Major Player Join Date: Aug 2003 Location: Poplarville, MS Posts: 453	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)

January 27th, 2004, 09:26 PM	#53
Frank Ladner Major Player Join Date: Aug 2003 Location: Poplarville, MS Posts: 453	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?

January 27th, 2004, 09:26 PM	#54
Todd Birmingham New Boot Join Date: Jan 2004 Location: Detroit, MI Posts: 18	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?? __________________ www.detroitfilms.com

January 27th, 2004, 09:42 PM	#55
Todd Birmingham New Boot Join Date: Jan 2004 Location: Detroit, MI Posts: 18	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. __________________ www.detroitfilms.com

January 27th, 2004, 10:07 PM	#56
Alain Dumais Regular Crew Join Date: Jan 2004 Location: Montreal Canada Posts: 86	Todd 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

January 27th, 2004, 10:47 PM	#57
Alain Dumais Regular Crew Join Date: Jan 2004 Location: Montreal Canada Posts: 86	Todd ----Could you post a close-up detail pic of the finished GG---- http://www.kheops-tech.com/~ad3d/Aldu35.jpg

January 28th, 2004, 12:00 AM	#58
Brett Erskine Major Player Join Date: Dec 2003 Location: Anaheim, CA Posts: 445	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

January 28th, 2004, 12:57 AM	#59
Jim Lafferty Major Player Join Date: Dec 2003 Location: Brooklyn, NY Posts: 636	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 __________________ Realism, anyway, is never exactly the same as reality, and in the cinema it is of necessity faked. -- J-L G

January 28th, 2004, 01:03 AM	#60
Richard Mellor Major Player Join Date: Nov 2003 Location: cambridge ma Posts: 247	flipping the image aldu35 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