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 |
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. - jim |
moniteur
4" tft
http://www.bullnet.co.uk/shops/test/tft.htm |
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 |
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! |
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 |
Hmmm....what if we all do this?
<-----Read----------Learn----------Progress----->
-Brett Erskine |
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. |
GotGrit.com
Quote:
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. |
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. |
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?
|
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.) |
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. |
Cool Clip, Paolo
Paolo Rudelli: I like chopping oranges and cups and saucers.
Nice clip :) |
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 |
All times are GMT -6. The time now is 05:48 PM. |
DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network