I know, the glass is not exactly what you'd choose immediately, and the color is a bit blue, with the minimum 70% focus at 538.754 nm. Still, with the very...
785
rflrs2000
May 31, 2011 10:24 am
This (design Baker3-51x in the rflrs subdirectory) is not a new design, just a look at it from a different angle. I held the aperture stop (at the first...
786
glasspusher2000
Jun 3, 2011 6:35 pm
Does anyone have or know of any tutorials for ATMOS? Any help greatly appreciated. Thanks, John...
787
rflrs2000
Jun 4, 2011 2:25 am
... Yes, it would seem that, while these two glasses seem relatively well-matched for dispersion against fluorite, they are not well-matched to correct field...
788
rflrs2000
Jun 4, 2011 2:26 am
... If you get no response for this, maybe we can at least answer questions....
789
Chuck
chucktaylor3us
Jun 4, 2011 2:34 am
The last time I looked, there weren't any tutorials, but as already noted, there are very knowledgable people here who can answer questions. Chuck Taylor...
790
rflrs2000
Jul 22, 2011 10:58 pm
Let me know how you think design dbl06-33x vs. design Ptz15-99x (both in the rflrs file subdirectory) is an improper comparison....
791
Richard F.L.R. Snashall
rflrs2000
Aug 4, 2011 12:44 pm
I finally got over the hurdle and fixed the race condition that occurred when searching the catalogs for a particular glass type. The new tools are at: ...
792
Richard F.L.R. Snashall
rflrs2000
Aug 9, 2011 12:01 am
From all the information I was able to glean: In a few days, my web site http://mysite.verizon.net/rflrs will be coming down. If anyone wants to get a copy of...
793
Alan French
alandfrench
Aug 10, 2011 3:10 pm
Hi Folks, Is there some way in ATMOS to change the focal length without changing the aperture too? I would have thought "Scale Focal" would do that, but it...
794
Richard F.L.R. Snashall
rflrs2000
Aug 10, 2011 3:19 pm
... If you use it to scale the focal length and simply change the Entry Beam Half-D back to the original value (and make the appropriate changes in the ...
795
Alan
alandfrench
Aug 11, 2011 11:17 am
Yes, that would work. It puzzles me, though, that the "Scale System" and "Make Focal" tools do exactly the same thing. Scaling increases or decreases the...
796
Richard F.L.R. Snashall
rflrs2000
Aug 11, 2011 11:25 am
... How would it know, for example, what color correction to put on the system? Or, if you wanted the spherical aberration slightly over- corrected? Aren't...
797
rflrs2000
Aug 13, 2011 11:33 pm
The issue of matching Hydrogen-alpha and Calcium-K came up elsewhere. This design (design Ptz16-05y in Files subdirectory rflrs) was an attempt to do it with...
798
roger_russelburg
roger_russel...
Aug 19, 2011 7:41 pm
Hi I found a new astrograph design tool. (PointSpread 7.8 English) by Hans-Jürgen Busack PointSpread designs a Cassegrain, a Achromatic Lens, a Schmidt,...
799
chris1011@...
uncarollo2
Aug 19, 2011 8:41 pm
In a message dated 8/19/2011 2:42:03 PM Central Daylight Time, ... ATMOS has a similar design tool, just sayin' Rolando In a message dated 8/19/2011 2:42:03 PM...
800
roger_russelburg
roger_russel...
Aug 19, 2011 11:12 pm
Sorry Here is the link. http://www.busack-medial.de/download.htm Roger...
801
roger_russelburg
roger_russel...
Aug 19, 2011 11:12 pm
Hi Rolando I am interested in the Medial Triplet at F/2.3 and the Medial Cass at F/3.0. This fast for an Astrograph. The Triplet uses full size front lens, a...
802
chris1011@...
uncarollo2
Aug 19, 2011 11:46 pm
In a message dated 8/19/2011 6:12:57 PM Central Daylight Time, ... Medials are enjoying a Renaissance. We sell a 305mm F3.8 astrograph based on this concept. ...
803
chuck@...
chucktaylor3us
Aug 20, 2011 1:21 am
ATMOS is also very easy to learn and has the advantage that there are numerous users here who can help tweek designs. Chuck Taylor...
804
rflrs2000
Aug 29, 2011 6:31 am
Going back to the original question, what can be changed to get some characteristics. If longitudinal color is allowed to roam freely, the result is markedly...
805
rflrs2000
Sep 3, 2011 3:26 am
Within another glass source (LZOS), another possibility is design Ptz16-26x. Most of the glass is okay, except glass type KF6 may be moisture sensitive. The...
806
rflrs2000
Sep 10, 2011 5:03 pm
Instead of optimization of an achromat by mating the crossover of the outer two wavelengths, I optimized by matching the OPD of the two outer wavelengths for...
807
athenabout
Nov 7, 2011 12:12 am
Hello, I thought I'd send out this note to see if anyone out therecould help me or get me some advice. I have a 12 1/2 inch primary in a sphere (1620mm...
808
Richard F.L.R. Snashall
rflrs2000
Nov 7, 2011 9:22 pm
... I assume the design with "SK5" is the one with a Pilkington substitute, DBC589613A, for Schott SK5; correct? I wondered if the difference in refractive...
809
eo_engineer
Nov 8, 2011 11:17 pm
... I agree; not much different from the original (if I am interpreting all of the file information correctly, and changing back to SK5 in your design, since I...
810
Richard F.L.R. Snashall
rflrs2000
Nov 8, 2011 11:25 pm
... I optimized for RMS error. Under that criterion, I found that it actuallly might be better to put the last lens coincident with the primary. Maybe that ...
811
eo_engineer
Nov 9, 2011 5:34 pm
... Interesting. I am assuming that you optimized for minimum RMS _wavefront error_, which is what I would have expected. I am especially concerned about the...
812
athenabout
Nov 10, 2011 1:14 am
Hello. I recently joined and, for some reason, just recieved the last e-mail. I plugged in the new numbers into MODAS and perhaps there is some bug or I'm...
813
eo_engineer
Nov 10, 2011 2:16 pm
... e-mail. I plugged in the new numbers into MODAS and perhaps there is some bug or I'm doing something wrong. I keep seeing an anoying red ring in the spot...
