Static 35mm Adapter Solution

Brett Erskine · January 27th, 2004, 11:56 PM

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

Todd Birmingham · January 28th, 2004, 02:25 PM

This might be straying a little too far out of our comfort range (I have almost no idea what they are talking about), but I found this pdf file on the web:

http://www.k-ids.or.kr/science/confe...ion_A/a6.2.pdf

It's a proposal for using a lenticular lens in a rear projection television system. It seems like this is kind of what we are going for, but on a much smaller scale.

If someone can do anything with this, perhaps a lenticular lens could work?

Louis Feng · January 29th, 2004, 12:33 AM

<<<-- Originally posted by Nathanael Jackson : hey louis... you've been absent from this forum for quite a while now... how about them holographic screens?

I remember the longest time ago on the agus thread there was talk of having actual plans... seems that topic dwindled to nothing... seems like that would be the best thing to really work on to jump start some real progress again around here...

sorry, it just seems like nothing's really gone anywhere for the last 3 weeks or so -->>>

Well, there are a number of reasons why I was absent, and some are beyond my control. I'm not going into the details or making any promises, but I am going to have something to show in a couple of days, not weeks (the last part is coming, having my fingers crossed).

Dean Harrington · January 29th, 2004, 06:19 AM

good for you. Hope for some solutions on the static GG

Filip Kovcin · February 6th, 2004, 03:12 PM

hey guys, is this thread dead?

what are you doing... any news?
louis, give us a clue...
aldu 35 is ok, but anyhow it needs image inverter, so we will back here anyday now...

filip

Brett Erskine · February 6th, 2004, 03:32 PM

I agree. Currently there are two thoughts on this particular problem:

1)on board image flipable LCD screen

or

2)Pechan prism>roof pentaprism or mirror>roof pentaprism

Whatever we end up doing something HAS to be done. You just cant expect to professionally and consistantly operate a camera if you dont correct for both up and down - left and right.

Check out the other threads in "Towards a Film Look Using DV" to find out the latest

Justin Burris · February 10th, 2004, 01:03 AM

Any quick updates on the holographic diffusion? I'm really looking forward to your conclusions on this. Sorry for the impatience. Thanks.

Tavis Shaver · February 22nd, 2004, 03:58 AM

tag

January 28th, 2004, 02:25 PM	#137
Todd Birmingham New Boot Join Date: Jan 2004 Location: Detroit, MI Posts: 18	This might be straying a little too far out of our comfort range (I have almost no idea what they are talking about), but I found this pdf file on the web: http://www.k-ids.or.kr/science/confe...ion_A/a6.2.pdf It's a proposal for using a lenticular lens in a rear projection television system. It seems like this is kind of what we are going for, but on a much smaller scale. If someone can do anything with this, perhaps a lenticular lens could work? __________________ www.detroitfilms.com

January 29th, 2004, 06:19 AM	#139
Dean Harrington Major Player Join Date: Nov 2002 Location: Tokyo Posts: 898	Louis.... good for you. Hope for some solutions on the static GG

February 10th, 2004, 01:03 AM	#142
Justin Burris Regular Crew Join Date: Jan 2004 Location: Olympia, WA Posts: 54	Louis? Any quick updates on the holographic diffusion? I'm really looking forward to your conclusions on this. Sorry for the impatience. Thanks.

January 27th, 2004, 11:56 PM	#136
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 29th, 2004, 12:33 AM	#138
Louis Feng Vendible Book Join Date: Dec 2003 Posts: 59	<<<-- Originally posted by Nathanael Jackson : hey louis... you've been absent from this forum for quite a while now... how about them holographic screens? I remember the longest time ago on the agus thread there was talk of having actual plans... seems that topic dwindled to nothing... seems like that would be the best thing to really work on to jump start some real progress again around here... sorry, it just seems like nothing's really gone anywhere for the last 3 weeks or so -->>> Well, there are a number of reasons why I was absent, and some are beyond my control. I'm not going into the details or making any promises, but I am going to have something to show in a couple of days, not weeks (the last part is coming, having my fingers crossed).

February 6th, 2004, 03:12 PM	#140
Filip Kovcin Major Player Join Date: Dec 2003 Location: warsaw, poland Posts: 440	hey guys, is this thread dead? what are you doing... any news? louis, give us a clue... aldu 35 is ok, but anyhow it needs image inverter, so we will back here anyday now... filip

February 6th, 2004, 03:32 PM	#141
Brett Erskine Major Player Join Date: Dec 2003 Location: Anaheim, CA Posts: 445	I agree. Currently there are two thoughts on this particular problem: 1)on board image flipable LCD screen or 2)Pechan prism>roof pentaprism or mirror>roof pentaprism Whatever we end up doing something HAS to be done. You just cant expect to professionally and consistantly operate a camera if you dont correct for both up and down - left and right. Check out the other threads in "Towards a Film Look Using DV" to find out the latest

February 22nd, 2004, 03:58 AM	#143
Tavis Shaver Major Player Join Date: Oct 2003 Location: Vancouver, BC. Canada Posts: 209	tag