It is only difficult if you try to match the ROC of the secondary to the figure of the primary. It is much easier to finish the secondary, and then figure...
what the purpose of your mesument verify calculus atm project what kind of pecision do you need jack 47'n 71'W Dear Guys, Please check the picture attached to...
i am grinding a 6 inch f10 mirror & right now i am in polishing stage. This is my first mirror & i need to be sure about its focal length & Spherical shape at...
I would 2nd that comment. The primary correction needs to be held within +_ 0.01% correction and that's usually with a primary that's F/4 or faster. Also the...
sombody have a kind of procedure for testing whit laser pointer I have one that give me a pattern of circle dot maybe put it a far as possible and i can have a...
I give a pressure gage to my dauther for his car and byke but his byke is a roud type whit 115 to 130 lb not 30 like a car the gage go from 0 to 60 how i can...
Two options come to mind, one lever reduction, the other is have the high pressure side push a larger piston so the force is spread over a larger area, but I...
Bonjour Jaques, Sorry, but that's about as far as I go en francais! Here's a link to an ebay 'buy it now' auction a bike tire gage that reads up to 160 PSI,...
Hi Nazim You don't need the diagonal piece. Just reflect the Sun's image onto a white or light coloured surface directly. Say the corner of a house. Try to get...
Its also worth going here http://networkadvertising.org/managing/opt_out.asp to opt out of a variety of advertising systems but check tribal fusion as you may...
Hi Lance. I did sort of intimate that. There is still the problem of having to make a mirror with a very specific curve which ever one is made 1st. There was a...
On tilt and decentering etc you might be able to do something with winspot. It's a tct telescope design program and very easy to use. Olso lt will also do that...
All of the DK sets I've made have been longer the F/20, used almost exclusively for lunar and planetary imaging where the camera chips are typically small...
... To my mind, the most interesting DK designs are the type that use a two element corrector group near focus. Some of these can deliver large diffraction...
I picked up two 127mm f5.5 objectives this week and I plan on building a big bino. I'm looking for two 1 1/4" helical focusers for the project. I've looked all...
That sounds like one of the tilted component designs based on I think a corrector by Baker. If so a design comes with winspot but a close examination shows...
Celestron conversion ... Hi, This is my first post here and I will unashamedly admit I am seeking advice and what better repository of knowledge could there be...
Hi; Measure the diameter of your tube I have made a vaccuum box to do a 10 inch corrector plate. Email me if you want to borrow it. Newport Glass carry the...
... That sounds like one of the tilted component designs based on I think a corrector by Baker. If so a design comes with winspot but a close examination shows...
Hi Gordon, Thank you for taking the time to reply to my thread. I admire your skill if you have already produced the vacuum box for making a corrector plate...
My 8" F10 Mak-Cass, made by the late Max Bray, used a ribbed blank from the discontinued Celestron 10" Schmidt-Cass/camera as the primary. The 10" blank was...
Hi Don, An 8" Mak sounds a great idea and my apoligies for not having heard of Max Bray as he sounds like a very clever guy it is a shame he is no longer with...
i have a celestron computerized NexStar102SLT that needs to have the remote control firmware reflashed. does anyone know the pinout of the modular (motor end)...
Hi Mel, This is interesting. I don't have Schroeder's but I think I have enough info from your description to ray trace that. On corrected DK's I've been...
... Indeed. It's sometimes amazing (to me, anyway) what a couple of simple refractive elements can do. Here is a corrected DK (well, the conic had to be...
http://www.atmlist.net/contrib/atmpob-at-yahoo-dot-com/Thumb_print.jpg <http://www.atmlist.net/contrib/atmpob-at-yahoo-dot-com/Thumb_print.jpg> Here is a thumb...
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