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Old March 12th, 2004, 12:48 PM   #541
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people who want the X-Y switchable LCD's, just do an eBay search for a brand called " lilliput ", make sure you buy a TFT and not an STN screen.

http://www.amazon.co.uk/exec/obidos/...704539-6752633


Its kinda funny how these are things we already discussed 2 month ago, but oh well...here we go again.

gas
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Old March 12th, 2004, 12:57 PM   #542
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Well...

It's not as if I'm about to strap a 6" LCD screen to my camera. Thanks for the links but they do me no good.

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Old March 12th, 2004, 01:11 PM   #543
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moniteur

4" tft

http://www.bullnet.co.uk/shops/test/tft.htm
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Old March 12th, 2004, 02:06 PM   #544
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John Gaspain

Please don't recomend or buy this, I have this model and this is real crap.

http://www.portablemp3playerstore.c...ial/th-5688.htm


Paolo Rudelli

the one you sugest has only
Resolution 383(H) * 234(V) DOTS
It's not good enought to be able to make focus whit this.


Alain
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Old March 12th, 2004, 02:41 PM   #545
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Re: moniteur

<<<-- Originally posted by Paolo Rudelli : 4" tft

http://www.bullnet.co.uk/shops/test/tft.htm -->>>

I guess you could just mount that one upside down.

AH HA! or Ureka...anyways, yea just mount a regular $50 4"LCD UPSIDE DOWN!
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Old March 12th, 2004, 06:22 PM   #546
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Don't know if this website is currently used by anyone in here. Thought it might be useful to someone:

http://www.einsteins-emporium.com/science/l-optics/sl215.htm
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Old March 12th, 2004, 10:26 PM   #547
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Hmmm....what if we all do this?

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Old March 13th, 2004, 08:10 AM   #548
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TWO-LAYERED GROUNDGLASS.

For those who are following the fixed groundglass path, here is something which may be of use and someone might develop to a furthur stage than I have the time to do at present.

Whilst educating myself with microscope slides in the method of polishing glass before I turn myself loose on the real glass disks, I decided to see if I could replicate the partial polishing back of the plastic CD disks which seems to confer an improvement in the projected image.

I discovered after polishing back some of the frosted finish on glass slides to a semi-opaque condition, it would be of little use as a groundglass screen because of hot spot and some of the aerial image being apparent.

But with two such groundglasses mounted with polished-back frosted surfaces face-to-face, a more useful projection surface can be found with the finer texture remaining, therefore hopefully better resolution than with a single more opaque frosted surface of coarser texture.

The downside will likely be two internal reflective surfaces instead of one and anti-reflective coatings on the clear sides will likely be mandatory.
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Old March 13th, 2004, 09:49 AM   #549
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GotGrit.com

Quote:
Has anyone ordered 5 micron grit from www.gotgrit.com yet?
Yes, I did. The guy's name is Tom. Very helpful. I got WAO 5 Micron (white). I also wanted 3 Micron but he didn't have WAO 3 at the time. I did buy some 1 Micron he had (left over from a previous special order) but from what I can tell it's a little too fine and polishes more. He did suggest trying Cerium Oxide (CEO) as a substitute for Aluminum Oxide. He said CEO was soft like WAO and might work as well. Although I didn't order any so I don't know.

Anyway, his WAO seems extremely consistent and from what I can tell, made a beautiful GG. I hope to be testing it this weekend/early next week.
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Old March 13th, 2004, 12:01 PM   #550
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I just placed an order at gotgrit.com for the following items:

Aluminum Oxide
WAO5-025 WAO 5 Micron 1/4 LB $1.75USD
Cerium Oxide
CEO-025 CEO 1/4 LB $4.50USD


I don't know much about the Cerium Oxide, but I spoke over the phone with the owner (very friendly and helpful) and he suggested it, so I'll try it out on a piece of glass or something and let you guys know how it goes.
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Old March 13th, 2004, 12:19 PM   #551
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Its been mentioned that Cerium Oxide is similar in hardness, but did you get any information on how it compares to Aluminum Oxide in grain size?
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Old March 13th, 2004, 12:57 PM   #552
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Nicholi: I told him that I required something fine for making ground glass and he suggested the WAO 5 and CEO, so I took it that the CEO was comparable in size, since he mentioned them together.

However, I just called back and spoke with Tom and he said that the CEO is 2 micron. So...looks like that won't do me any good for the ground glass. However, I won't mind having it incase I decide to one day make a mirror. :-)
Also, he mentioned that the CEO creates some sort of chemical reaction with the glass when grinding.

Guess I should have ordered WAO 9 instead of CEO with the WAO 5, but hopefully the WAO 5 will be coarse enough to make a fine ground glass. (Thanks for the feedback, James.)
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Old March 13th, 2004, 01:06 PM   #553
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An amateur telescope making site I saw described making a mirror using Aluminum Oxide for the 'Fine Grinding' (down to about 3 micron) and then to use the Cerium Oxide for 'Polishing' - which goes much much finer.

Has anyone gone much finer than 1000 grit?

I've got my first adapter done with the 1000 grit and a big fat condenser (no hot spot). My only problem is that I want to be able to stop down the aperture of my SLR lens. Very very short Depth of Field is good sometimes, but not all the time.

I definitely see hotspotting at 22, but in the 11 range, I have a nice consistently bright image with a longer depth of field.

The downside - as you stop down the aperture, the grain just jumps right out. At F2.8 (my current lens' max ap), the grain is basically invisible - but at F11-- yuck.
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Old March 13th, 2004, 01:25 PM   #554
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Cool Clip, Paolo

Paolo Rudelli: I like chopping oranges and cups and saucers.

Nice clip :)
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Old March 13th, 2004, 01:59 PM   #555
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Grit vs Micron

Well unless this chart is inaccurate or I'm reading it wrong, 5 Micron = 4,500 Grit.

http://www.facetingmachines.com/grit-mesh-micron.shtml
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