I have finally finished my report on the interferometry part of the "round robin" testing of Scott Milligan's mirror that resulted from the threads on ...
Steve, ... There is a world of difference between aligning a mount for photo and for visual - I usually just set it up on any reasonably flat ground and aim...
A CMOS circuit (a 555 heir or 4000 series) driving a MOSFET power transistor would likely work - the MOSFET when on would pass many amps with a small fraction...
... Steve, A lot of work and well done... Thanks for the thorough examination of the 3 sets of interferometry and the explanation of how you compared them....
Ken, ... Thanks very much. I learned a lot of lessons in the analysis that led to the report, including the following: - In doing interferometry at COC (e.g.,...
No, it was included in the post. A simple circuit really with the one end of the cap and the emitter of the transistor attached to ground and the resistor...
The secret is to completely disconnect the circuit when it is off as well as not need any other currents than what goes through the loads if possible. What...
Thanks, That is easy to visualize. I may give it a go with junk draw stuff and maybe I'll stumble onto a combination that works. I did find though, one of my...
... Steve: Nice work. I'm glad to see you've settled on LaTeX for this kind of report. Some more or less random questions and comments, starting with a couple...
... wrote: - If you're trying to measure astigmatism on a finished optic by the ... deflection ... Steve, I'm encouraged by the results that were seen from the...
... as well as ... possible. ... the current ... Bob... Charge resistor to VCC (via pushbutton) at one end, Cap and discharge (timing) resistor in parallel to...
JAF, ... Are you sure about this? This assumes that the normal to the glass surface where a lightray enters has the same direction as the normal to the glass...
Hi, Anyone has exact design data of commercial scopes such as Celestron C11 or Meade Schmidt Newtonian 10-inch? I want to have fun with Zemax on designing new...
... the)))) this is probaly true for a very thin glss but for a very stick glass the wave is modified in is larger and also your window ,is it curved in but...
... HEY! ZEMAX.. We don't need no stinking ZEMAX, we got opinions! Thanks James! We can always count on you to chime in at the right time. Ken Hunter...
The only real problem with FETs is that they need a big voltage to turn on, on hte order of 3V. Since most power sources that we're talking about are only...
I say grind the 6 inch yourself. Not only will you have the satisfaction of having made the optics of a telescope yourself, but it's a lot easier to take the 6...
... Do you mean meniscus? If that is the case then the original Maksutov formula was (ref: Rutten and van Venrooij): R2 - R1 = ( ( n^2 - 1 ) / ( n^2 ) ) * t ...
Thank you for this work, Steve (and to the others involved). Mr. Milligan and I have spoken about this subject, and it is encouraging to see good experimental...
ok beautifull formula if I untherstand well the R1 is the frony one the 100mm x 15 = 1500mm and the R2 = ( ( n^2 - 1 ) /( R1*( n^2 ) )) * t and I have to play...
Lance, Thanks. I think that is what I'll end up doing. But in this regard, is grinding a very long focal length (f8 - f10) lens more demanding than an f4? ...
Steve, are you doing a mirror or a lens? At F10, a lens would be fairly short but a mirror would be fairly long at that ratio. The mirror at F10 will be a bit...
Bob, It's a mirror and I have a question about parabolizing. I've seen a few grinding journals and postings that hint at how remarkably quick from a sphere to...
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