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Old August 10th, 2004, 09:51 PM   #1036
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anyone know where to get 5micron grit? jim, the gotgrit site has not processed my order since august 4th. so i need to find somewhere else that sells cheap AO
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Old August 10th, 2004, 10:38 PM   #1037
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If it's only been since Aug 4th, I'd chill out and write them an email. It took about a week for my order to be processed, then a few additional days to arrive. They seem like good people -- just drop them a note and see what's what before cancelling.

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Old August 10th, 2004, 11:02 PM   #1038
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well i already cancelled the order. what about the site you listed in your instructions? whats so bad about them? or where else can i get the 5micron AO?
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Old August 11th, 2004, 12:30 AM   #1039
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I had to pull my sample videos of my GG orbiter working at HD 720P resolution, because I only get 5 gig a month transfer. About 150 people saw the demo. I can email a link if someone needs to see it for more than curiosity reasons, the video was 24 megabytes.

Am I the only one that actually posted some demo video to show the DOF working? I'm not talking about web quality video, I'm talking 8 megabit/sec full resolution, with a slow pan to show the grain not showing up as a fixed pattern.

Any other demo stuff, or was I the only one to post video?

Maybe I missed a post, there has to be over 1000 posts on various attempts! "where's the beef?"

Thanks!
-Les
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Old August 11th, 2004, 01:42 AM   #1040
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Worldwide there are probably a whole slew of suppliers scratching their heads and asking themselves, what's going on with this sudden rush of small orders for 5 micron AO grit. Maybe Gotgrit is having to buy some more in. Lets hope they don't get stuck with a whole lot of it once the stampede dies down.

Regarding demo vision. Does vision of a spinner count. If so there's one on www.dvinfo.net/media/hart. (It's got sound too.) It doesn't stream and has to be downloaded.
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Old August 11th, 2004, 02:10 AM   #1041
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320 by 240 is a no go.

Yes, a spinner version *would* count!
But that video quality was, frankly, krap. ( the 9.5 meg MOV )
Common guys, we can't see anything at 320 by 240 pixel size!
This is what I'm talking about. Somebody must have posted something at quality size. Did I miss it?

To reiterate: The demo needs to be FULL SIZE.
Bit rate of at least 7 megbit/sec for a modern codec.
It should have some objects out of focus. ( helps see grain)
There should be a slow pan to see if there is fixed pattern grain.
Stills are completely useless to demonstrate a working system that has no grain or pulsing.

-Les

<<<-- Originally posted by Bob Hart :
Regarding demo vision. Does vision of a spinner count. If so there's one on www.dvinfo.net/media/hart. (It's got sound too.) It doesn't stream and has to be downloaded. -->>>
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Old August 11th, 2004, 04:34 AM   #1042
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Les-
Whats your actual target size on your GG for your adapter?
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Old August 11th, 2004, 04:58 AM   #1043
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Brett,
As I mentioned in the post where I had the links, it was about 30mm across. That made my 50mm lens act a bit longer, maybe 65mm.
The whole setup was temporary, the camera wasn't even held down with anything other than gravity! I was positioning it trying to get the biggest target in the viewfinder and still allowing focus to hold on the GG. I used auto focus on the GG but I checked that it could get there by switching to manual and seeing if I had some 'headroom' with the manual focus, then switching it back to auto. Seemed to work.

Did you look at the video? Thoughts?
I got only one comment. I figure people are either depressed looking at the HD like that and just clammed up, or they just don't care about the whole DOF thing that much any more. Or they are busy with milk and balloons and office supplies making one of these !

-Cheers
-Les


<<<-- Originally posted by Brett Erskine : Les-
Whats your actual target size on your GG for your adapter? -->>>
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Old August 11th, 2004, 12:28 PM   #1044
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The link I've got posted on the tutorial is for 1000 grit grey aluminum oxide. Sitting it next to the WAO 5, the difference is striking -- the former feels close to table salt, the latter to flour.

It's been my experience that, provided you grind properly with WAO5, it's about ten minutes of grinding to get a uniform, scratch-free surface. The grey 1000 grit leaves uneven scratches behind, nevermind the fact that the coarser grind of it makes to GG more opaque than it should be -- so you loose more light.

The keys to a good grind:

1) Grind on a flat, level surface -- I used a formica tabletop.

2) Grind using a piece of glass placed over the GG, and not the other way around -- this distributes pressure evenly, reducing the likelihood of sratches.

3) Where WAO is concerned, "less is more" -- use just a pinch of it, and about three times its volume in water. When you place the grinding glass over the filter, the water should spread evenly and soak the WAO thoroughly -- dry patches of WAO mean you're likely going to gauge scratches into your GG surface. You can even give the process a head-start by waiting to allow the water to soak into the WAO before applying the grinding glass.

4) Remember this line from 'Ronin' -- if there is any doubt, there is no doubt. Think you might have dry WAO? Don't risk grinding. Wash the surface and re-apply. Think you might scratch the wrong side of your GG? Mark the glass at the edge.

Les,

As for video, I've uploaded full res footage with my 1000 grit GG, and have since pulled it. I'm waiting for the opportune time to finish the latest adapter -- have already finished the WAO5 GG, today picking up more PVC, some plastic dye or primer if I can find it -- and should have new and improved footage in about week.

- jim
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Old August 11th, 2004, 04:43 PM   #1045
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Good to see you're still around, Brett. I owe you an email but as you can see I'm busy here, typing away :D

Went out looking for black PVC today and came away with black versions of the female half of the 2" PVC coupling. The guy at the shop says he could order male halves, though I'd have to order them by the box. They're about 75 cents each piece, though I don't plan on needing a whole box of them so for now I'm just going to sand down and color the white male halves I have around. I plan on sanding, priming and painting it, but placing electrical tape on the interior rim of the adapter where it slides over the Century Optics macro -- this way, there's no chance of paint chipping.

To that end, I picked up the plastic paint primer mentioned above -- it's official name is "Bond Aid -- Paint Adhesion Promoter," from a company called Klean-Strip, the "surface prep specialists." I got it at an Auto Zone for about $6 -- the can's 12oz and features a gold, black and white color scheme, with a picture of a car's front-end on one side. Pics of this will be in my new tutorial.

On a related up note, the female halves I purchased have a uniformly smooth outer surface, as do the male halves I picked up, so there's a step of filing eliminated. The rim of the black PVC reads like this:

2867 ABS-1 c 2 NSF-dwv UPC MADE IN USA


- jim
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Old August 11th, 2004, 05:14 PM   #1046
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hey jim, if i paypal you some money, can you send some AO to me? let me know my email is vold@adelphia.net
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Old August 11th, 2004, 06:33 PM   #1047
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Can't do PayPal at the moment -- I've just moved and can't for the life of me get a bank account.

First, I needed a utility bill but I only had photo ID and SS card. Then I got a util bill, but apparently a cell phone bill doesn't qualify. Then I got a water bill, plus photo ID, but on the one I'm "Jim Lafferty," and the other, "James." They claim the discrepancy makes it impossible to open an account! :(

- jim
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Realism, anyway, is never exactly the same as reality, and in the cinema it is of necessity faked. -- J-L G
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Old August 11th, 2004, 07:21 PM   #1048
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then out of the kindness of your heart, you think you can send me enough AO to make ground glass? ill mail you back some cash. lmk if you can and ill give you my address.
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Old August 11th, 2004, 08:39 PM   #1049
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Les.

If you send me a postal address on the email via the profile menu on the page here, I can send you a DVD+R disk via the snail with a .avi file on it.
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Old August 12th, 2004, 01:33 AM   #1050
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<<<-- Originally posted by Les Dit : I had to pull my sample videos of my GG orbiter working at HD 720P resolution, because I only get 5 gig a month transfer. About 150 people saw the demo. I can email a link if someone needs to see it for more than curiosity reasons, the video was 24 megabytes.
-Les -->>>


Hi Les, I'm planning on building something based on your general idea. I'd really like to see your video. You can email me via my profile here.

I've got a couple questions for you though. Are you inverting/reversing the image or doing that in post? Also, did you use any extra lenses between the lens and your vibrating GG?
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