... Roman, Short focal lengths are nice because they allow wide fields. Another big advantage, to me, is the shorter tube length. If a 6" f/4 is as long as a...
374
chris1011@...
uncarollo2
Mar 20, 2006 6:58 pm
In a message dated 3/18/2006 11:07:21 AM Central Standard Time, ... Nothing wrong with short EFLs. Many people buy Televue Petzvals, never realizing that their...
375
eo_engineer
Mar 20, 2006 9:33 pm
I just spent some time actually reading a web site that many of you are probably familiar with, that deals specifically with the design of telescope...
376
Chuck Taylor
chucktaylor3us
Mar 22, 2006 9:24 pm
I realize this is somewhat OT, but I am considering a new newt ... looking for advise from people who know optics, hence the question is posed here. I would...
378
Chuck Taylor
chucktaylor3us
Mar 22, 2006 10:28 pm
... They're both troublemakers. <g> ... And...? Incidently, anyone can feel free to send responses offlist if you want your comments to remain confidential....
379
andrea tasselli
andreatax
Mar 22, 2006 11:26 pm
... I assume you want them to be US/Canada based, right? Andrea T. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo!...
380
Chuck Taylor
chucktaylor3us
Mar 23, 2006 12:03 am
... Hi Andrea, Yes. I should have specified locale. I'm in the US and would prefer not having to go overseas. Thanks Chuck...
381
Chuck Taylor
chucktaylor3us
Apr 1, 2006 8:05 am
Optical performance has always been limited by the glasses employed. Those who claim to have a secret configuration that uses ordinary glass, but eliminates...
382
andrea tasselli
andreatax
Apr 1, 2006 12:53 pm
... Radioactive EPs is the way to go then :-) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam...
383
eo_engineer
Apr 1, 2006 11:56 pm
... Cute. You had me going there for a bit. I'm amazed at how much effort you put into this....
384
DBogan3220@...
dbogan3220
Apr 2, 2006 12:54 am
APRIL FOOLS Figured it out with these two para's plus its APril the 1st Clear Skies Dwight L Bogan In a message dated 4/1/2006 5:02:44 PM US Mountain...
385
rflrs2000
Apr 10, 2006 7:32 am
... That discussion of quadratic and cubic fits got me to finally generate a document describing the fits I use in the GSUM tool. Any are welcome to comment: ...
386
rflrs2000
Apr 10, 2006 11:31 pm
... Not at all doable. H is bounded below. Maybe some funky logarithmic function is needed to allow shifting; use of that function might destroy the original...
387
rflrs2000
Apr 14, 2006 4:33 am
Maybe not that funky. Another possibility I had not looked at was to add an IR singularity, similar to most current Sellmeier approximations: H = juv * delta...
388
alandfrench
Apr 26, 2006 1:26 am
I understand adding a prism to an optical system is essentially the same as introducing a thick plano-plano plate. Can I analyze the aberrations introduced by...
389
andrea tasselli
andreatax
Apr 26, 2006 10:48 am
... Just remember that a prism is not rotationally symmetric so the two are not exactly the same. ... Crap? Andrea T. ...
390
Alan French
alandfrench
Apr 26, 2006 1:17 pm
So I guess it would be an approximation, but at least allow me to play with them in ATMOS. I think "crap" is probably about right. ... From:...
391
chris1011@...
uncarollo2
Apr 26, 2006 2:06 pm
In a message dated 4/25/2006 8:30:04 PM Central Daylight Time, ... Yes. Rolando...
392
alandfrench
May 4, 2006 12:51 am
Has the move to more eco-friendly glasses and the elimination of lead, cadmium, and such in optical glass caused problems for designers and manufacturers? Are...
393
rflrs2000
May 4, 2006 7:16 pm
... In this instance (new files), there is, I think, low loss. Curious... also, in this case, the 25% price/weight loss is just matched by a 25% weight...
394
chris1011@...
uncarollo2
May 10, 2006 3:37 pm
In a message dated 5/3/2006 7:51:41 PM Central Daylight Time, ... Not really. Some of the newer glasses actually have the same or better qualities. Rolando...
395
Alan French
alandfrench
May 10, 2006 5:16 pm
Thanks! ... From: <chris1011@...> To: <ATM_Optics_Software@yahoogroups.com> Sent: Wednesday, May 10, 2006 11:37 AM Subject: Re: [ATM_Optics_Software] The...
396
ysaohloaor
May 18, 2006 1:22 am
Dear Group: Several people have developed the so-called "Matching Ronchi Test" as a way of placing a quantitative upper bound on particular aberrations in a...
397
kulginoff
May 18, 2006 9:09 am
What kind of merit function will yield the classical achromatic correction in automatic optimisation? Dmitri...
398
rflrs2000
May 18, 2006 7:05 pm
... Assuming that what we've been doing with Petzvals is "classical", I took a few minutes and adapted the merit function I've been using for them to a simple...
399
kulginoff
May 19, 2006 7:40 am
Thanks a lot! Dmitri...
400
rflrs2000
May 20, 2006 8:51 pm
... I was unable to get any great improvement with S-FPL53 in the second element; I had heard it was that bigger size that was so hard to get. Was something...
401
rflrs2000
May 25, 2006 3:00 pm
... i.e.: as opposed to something like Ptz04-22x.atm?...
402
rflrs2000
May 26, 2006 1:33 pm
I have added another version of that Petzval, Ptz04-25x.atm. I have been considering the possibility that there is another degree of freedom available. In...
403
eo_engineer
May 28, 2006 6:52 pm
... I finally got a chance to look at your files this weekend. Unfortunately, it seems that I may not be correctly interpreting them. ( I don't have ATMOS.) ...
