Static GG

Scott Grocott · June 27th, 2005, 10:34 AM

My ground glass is the lens from an old slide projector.

I did a quick test this weekend with nice results. I laid on the Krylon Matte Finish Spray reasonably thick and didn't get surface noise until the light dropped a bit on an indoor shoot with a 1.4 105mm Nikon lens. The 50mm 1.4 footage looks great.

Anyone try this?.............tips?

Thanks much

Leo Mandy · June 27th, 2005, 01:53 PM

Nice move on the slide proj. Let's us see some shots, it will be interesting to see how it stacks up!

Dan Diaconu · June 27th, 2005, 03:31 PM

Bin there a year ago trying to get rid of the square engraving on a focusing screen. Nice results and light loss. Anyone curious about testing (and still tempted to use a condenser..) try this: spray the flat side of the condenser with "Glass coating- FROSTED" ($5 @Wal-Mart or any craft retail)
Cleans easy (in case you do not get it even the first time)
Go VERY light from about 15".If you lay it thick, the sharpness (and light) will decrease. Good luck.

Leo Mandy · June 27th, 2005, 03:50 PM

Dan was the 'BIN there' a play on words to show how well it worked? ;) Straight into the BIN!

I tried the same thing with a spinning CD with spray glue with varied results that weren't worth posting at the time, but the frosted might work well on a static GG.

Dan Diaconu · June 27th, 2005, 04:07 PM

No, just a words play. I keep all work as a "reminder" of all efforts and progress track. I still have it! Work(ed/s) just as well (except some light loss) as an original plain matte when in motion. Unsuitable for static (imo) Best for static (of what I have) is POC. Wax (et all) might be bettter than POC though.

Scott Grocott · June 27th, 2005, 05:56 PM

Dan,

I tried "Frosted Glass" but it left too much surface noise:
http://www.misterart.com/store/view/...ass-Finish.htm

Is that what you are reffering to?
What is POC?

I am now experimenting with this:
http://shop.store.yahoo.com/cinemasu...lmatfin13.html

and getting much better results...........

I will post some stills.

Thanks much.

Scott

Dan Diaconu · June 27th, 2005, 06:11 PM

yes, that's the one. as thin and from a distance as you can. you are welcome.

Scott Grocott · June 27th, 2005, 06:28 PM

Dan,

What is POC?

Dan Diaconu · June 27th, 2005, 08:25 PM

http://www.poc.com
http://www.poc.com/lsd/default.asp
http://www.poc.com/lsd/default.asp?p...&sub=lsdsheets

Andy Gordon · June 27th, 2005, 08:27 PM

I have a question for you Dan, you said:

Quote:

Originally Posted by Dan Diaconu

(and still tempted to use a condenser..)

You're implying a condenser is not required? I'm wondering how you've eliminated the hotspot without using one... is that down to the 35mm lens? Or zooming in on a smaller area (thereby narrowing your FOV)?

Scott Grocott · June 27th, 2005, 09:06 PM

Dan,

I see no prices anywhere..........

This is what you use?

Talk to me about this stuff. How are you implementing it?

thanks so much,

Scott

Aaron Shaw · June 27th, 2005, 09:32 PM

The POC holographic diffusers really are good! If you calculate everything for your system correctly you can even get one that diffuses light a certain number of degrees from on axis. It would allow you to get the most light physically possible if you designed the system around that.

Dan Diaconu · June 27th, 2005, 09:38 PM

Scott,
I only received a sample. I do not use it. I only tested the "look" and possibility of using it. It soaks light, “shaps” are sharp and "softs" are gorgeous. (I might make one MPIC using it since I got my 1.2/55 hehehe!!!!). Vigneting yes (above 18/24mm frame and subject to max aperture on the lens). Some of the smallest grain diffusers I have tested. Great for outdoors day. NEEDS LIGHT at night and indoors!!! Some previous tests here:
http://dandiaconu.com/gallery/Brightnes-tests
(last album on the page) Do not forget the images are Hi Rez!!! On a TV from DV (720/480), a lot less will be visible!!
With such GORGEOUS "soft BG" it is impossible to miss the grain. Wait: lock pan and tilt and roll focus only. It will show A LOT LESS.

Leo Mandy · June 29th, 2005, 10:38 AM

Dan,
How did the magnifying card work? I saw the brightness test (after looking at this thread) and it looks pretty good, but is the concentric cirlces the problem with it?

Dan Diaconu · June 29th, 2005, 10:52 AM

What you see is what you get. Magnif card is way to coarse for this job (unless moved A LOT!!!!!! 2mm radius? that would lead to other problems!) Not worth one's time. Nice try, but... no thanks kind'a'thing.

June 27th, 2005, 10:34 AM	#1
Scott Grocott New Boot Join Date: Mar 2005 Location: San Luis Obispo , CA Posts: 21	Static GG - Krylon Matte Finish Spray? My ground glass is the lens from an old slide projector. I did a quick test this weekend with nice results. I laid on the Krylon Matte Finish Spray reasonably thick and didn't get surface noise until the light dropped a bit on an indoor shoot with a 1.4 105mm Nikon lens. The 50mm 1.4 footage looks great. Anyone try this?.............tips? Thanks much Last edited by Scott Grocott; June 27th, 2005 at 03:28 PM.

June 27th, 2005, 09:06 PM	#11
Scott Grocott New Boot Join Date: Mar 2005 Location: San Luis Obispo , CA Posts: 21	Poc Dan, I see no prices anywhere.......... This is what you use? Talk to me about this stuff. How are you implementing it? thanks so much, Scott

June 27th, 2005, 01:53 PM	#2
Leo Mandy Major Player Join Date: Dec 2004 Posts: 749	Nice move on the slide proj. Let's us see some shots, it will be interesting to see how it stacks up!

June 27th, 2005, 03:31 PM	#3
Dan Diaconu Major Player Join Date: Dec 2004 Location: Vancouver, Canada Posts: 804	Bin there a year ago trying to get rid of the square engraving on a focusing screen. Nice results and light loss. Anyone curious about testing (and still tempted to use a condenser..) try this: spray the flat side of the condenser with "Glass coating- FROSTED" ($5 @Wal-Mart or any craft retail) Cleans easy (in case you do not get it even the first time) Go VERY light from about 15".If you lay it thick, the sharpness (and light) will decrease. Good luck.

June 27th, 2005, 03:50 PM	#4
Leo Mandy Major Player Join Date: Dec 2004 Posts: 749	Dan was the 'BIN there' a play on words to show how well it worked? ;) Straight into the BIN! I tried the same thing with a spinning CD with spray glue with varied results that weren't worth posting at the time, but the frosted might work well on a static GG.

June 27th, 2005, 04:07 PM	#5
Dan Diaconu Major Player Join Date: Dec 2004 Location: Vancouver, Canada Posts: 804	No, just a words play. I keep all work as a "reminder" of all efforts and progress track. I still have it! Work(ed/s) just as well (except some light loss) as an original plain matte when in motion. Unsuitable for static (imo) Best for static (of what I have) is POC. Wax (et all) might be bettter than POC though.

June 27th, 2005, 05:56 PM	#6
Scott Grocott New Boot Join Date: Mar 2005 Location: San Luis Obispo , CA Posts: 21	Dan, I tried "Frosted Glass" but it left too much surface noise: http://www.misterart.com/store/view/...ass-Finish.htm Is that what you are reffering to? What is POC? I am now experimenting with this: http://shop.store.yahoo.com/cinemasu...lmatfin13.html and getting much better results........... I will post some stills. Thanks much. Scott

June 27th, 2005, 06:11 PM	#7
Dan Diaconu Major Player Join Date: Dec 2004 Location: Vancouver, Canada Posts: 804	yes, that's the one. as thin and from a distance as you can. you are welcome.

June 27th, 2005, 06:28 PM	#8
Scott Grocott New Boot Join Date: Mar 2005 Location: San Luis Obispo , CA Posts: 21	Dan, What is POC?

June 27th, 2005, 08:25 PM	#9
Dan Diaconu Major Player Join Date: Dec 2004 Location: Vancouver, Canada Posts: 804	http://www.poc.com http://www.poc.com/lsd/default.asp http://www.poc.com/lsd/default.asp?p...&sub=lsdsheets

June 27th, 2005, 09:32 PM	#12
Aaron Shaw Major Player Join Date: Jul 2004 Posts: 587	The POC holographic diffusers really are good! If you calculate everything for your system correctly you can even get one that diffuses light a certain number of degrees from on axis. It would allow you to get the most light physically possible if you designed the system around that.

June 27th, 2005, 09:38 PM	#13
Dan Diaconu Major Player Join Date: Dec 2004 Location: Vancouver, Canada Posts: 804	Scott, I only received a sample. I do not use it. I only tested the "look" and possibility of using it. It soaks light, “shaps” are sharp and "softs" are gorgeous. (I might make one MPIC using it since I got my 1.2/55 hehehe!!!!). Vigneting yes (above 18/24mm frame and subject to max aperture on the lens). Some of the smallest grain diffusers I have tested. Great for outdoors day. NEEDS LIGHT at night and indoors!!! Some previous tests here: http://dandiaconu.com/gallery/Brightnes-tests (last album on the page) Do not forget the images are Hi Rez!!! On a TV from DV (720/480), a lot less will be visible!! With such GORGEOUS "soft BG" it is impossible to miss the grain. Wait: lock pan and tilt and roll focus only. It will show A LOT LESS.

June 29th, 2005, 10:38 AM	#14
Leo Mandy Major Player Join Date: Dec 2004 Posts: 749	Dan, How did the magnifying card work? I saw the brightness test (after looking at this thread) and it looks pretty good, but is the concentric cirlces the problem with it?

June 29th, 2005, 10:52 AM	#15
Dan Diaconu Major Player Join Date: Dec 2004 Location: Vancouver, Canada Posts: 804	What you see is what you get. Magnif card is way to coarse for this job (unless moved A LOT!!!!!! 2mm radius? that would lead to other problems!) Not worth one's time. Nice try, but... no thanks kind'a'thing.