Scott, did you try a guidescope?..pics look good, sharp stars. Herm ... -- APML Archives at <http://www.system.missouri.edu/apml/> --- Unsubscribe at...
Herm
hermperez@...
May 1, 2000 1:40 pm
31909
I would be interested in knowing just how much vigneting the 61 has , I have on order a MN-69 . Ted Ted Agos Acorn Hollow Obs. Sutton Ma. tagos@... ...
Ted Agos
tagos@...
May 1, 2000 2:12 pm
31910
Scott, ... You can get a very good idea how much vignetting there is by opening up the back of the camera with no film in it in the daytime. Point the scope at...
Chuck Vaughn
aa6g@...
May 1, 2000 3:24 pm
31911
Ted, ... I've had two sessions with the MK69 (I think you meant to indicate this scope in your message). I found what I consider significant vignetting with a...
Kolb, Jon
jkolb@...
May 1, 2000 3:28 pm
31912
Herm, I didn't try a guidescope as I wanted to try and get used to the newt ez-guider for when I get my 11 3/8 reflector finished. Also, I don't have a...
Scott Barbee
sbarbee@...
May 1, 2000 3:50 pm
31913
Hearing the wide praises for PJ400 I tried to get some from my pro shop. The last pro-pack had just been sold. There will be no more. I asked about LE400 and...
Thor Olson
Thor.Olson@...
May 1, 2000 4:04 pm
31914
I've posted the raw scan, as it may give a better "pre-processed" idea of the actual light cone. I'd be greatful for advise on if I'm scanning to light, etc....
Scott Barbee
sbarbee@...
May 1, 2000 4:14 pm
31915
Ted, these are two totally different beasts, one is a newt with a tiny secondary and the other is a cassegrain with a 50% secondary. I'm also eager to see the ...
Herm
hermperez@...
May 1, 2000 4:18 pm
31916
Thor, You might try Calumet Photo. I ordered a large stock from them recently. Mike Gregory ... -- APML Archives at <http://www.system.missouri.edu/apml/>...
Michael Gregory
mikeg@...
May 1, 2000 4:33 pm
31917
Jon, is there enough backfocus to use a Lumicon newt easy guider?, this guider needs an additional 0.7" of backfocus. Herm ... -- APML Archives at...
Herm
hermperez@...
May 1, 2000 4:44 pm
31918
Scott, you don't have any vignetting, assuming this is the whole frame and its uncropped. Herm ... -- APML Archives at <http://www.system.missouri.edu/apml/>...
Herm
hermperez@...
May 1, 2000 4:48 pm
31919
Herm, ... I don't see any either, and I'm astonished that a scope with a 30mm diagonal (based on the published claim of 20% central obstruction) can do this....
Kolb, Jon
jkolb@...
May 1, 2000 4:53 pm
31920
Herm, ... More than enough backfocus, in my opinion (but note that I have never seen or used an OAG). In fact, if the T-ring attaches directly to the NEG, you...
Kolb, Jon
jkolb@...
May 1, 2000 4:54 pm
31921
Scott, ... I see noticable vignetting on that scan. I sampled a number of points in Photoshop and the RGB values run around 90 near the center and 70 near the ...
Chuck Vaughn
aa6g@...
May 1, 2000 5:25 pm
31922
Someone recently mentioned that "Introduction to Widefield Astrophotography" is about to be published. I've lost the link, can anyone provide the webpage, ...
Blair Batty
bbatty@...
May 1, 2000 5:34 pm
31923
I see a bit also, but not anything like my 8" SCT was. And Jon, yes, the raw image, as well as the processed image of gamma cygnus is the full frame. Even...
Scott Barbee
sbarbee@...
May 1, 2000 5:58 pm
31924
... It's possible that the focal plane is far enough from the diagonal that the on-axis marginal rays from the mirror are not making it to the focal plane. If...
Aplanatic@...
May 1, 2000 6:00 pm
31925
... Its not "Introduction to...", its called "Wide-Field Astrophotography", writen by me! It is out from Willmann-Bell. Their web page is www.willbell.com...
Robert Reeves
rreeves@...
May 1, 2000 6:22 pm
31926
Hi Blair: The book is by Robert Reeves, a frequent contributor to this group. THe publisher is Willman-Bell, and they are quoting some delay in deliveries ...
Bert Katzung
katzung@...
May 1, 2000 7:02 pm
31927
... number ... The delay isn't that much. Like I said, pre-pub orders are being filled first, then all others ship after May 10th. Thats less than two weeks,...
Robert Reeves
rreeves@...
May 1, 2000 7:15 pm
31928
Mike, I just searched Claumet's listing for Kodak film. I did not see LE400 listed. Is it under another name, or at another place on their page? Mike Cole ...
Michael Cole
mrcolewa@...
May 1, 2000 7:22 pm
31929
Mike, I bought the PJ400. They still had it in stock. Mike Gregory ... -- APML Archives at <http://www.system.missouri.edu/apml/> --- Unsubscribe at...
Michael Gregory
mikeg@...
May 1, 2000 9:12 pm
31930
Chuck, Since each f/stop is 1/2 if going larger (if I'm remembering right), then that would indicate right at around 1/2 f/stop as I see it? Scott B. ... --...
Scott Barbee
sbarbee@...
May 1, 2000 9:39 pm
31931
Dave, I don't have the scope handy now, but this should be close. 6" main mirror 30mm secondary 3" from center of secondary to tube 1/2" focuser height 7/8"...
Scott Barbee
sbarbee@...
May 1, 2000 9:40 pm
31932
Nice going Scott. Guiding looks good and focus looks good. Bobby Middleton ... From: Scott Barbee <sbarbee@...> To: <astro-photo@...> Sent:...
Bobby Middleton
bobm@...
May 1, 2000 9:55 pm
31933
Hi.. Can anyone tell me where I can buy a 6-10x 60-80mm illuminated reticle finderscope with its m/brackets? Orion used to sell them, but I do not see that...
Jim Barclay
cosmos@...
May 1, 2000 9:57 pm
31934
Well, you can still buy Taks. The finders are about the best you can get but they'll cost a small fortune. Personally I would find a used ST-80 and put an...
Horr, Gene
GHorr@...
May 1, 2000 10:19 pm
31935
I believe Van Slyke Engineering has one or they used to. I haven't checked the web site lately. But its not as versatile as the one the Orion used to sell. ...
JOSEPH BLANKIER
beguine@...
May 1, 2000 10:48 pm
31936
... but ... When I add up your numbers, I get 7.9" from the secondary to the focal plane. If this is close, a quick ray trace reveals that you are only using ...
Aplanatic@...
May 1, 2000 11:25 pm
31937
Dave, My figure of 90mm may be off a good bit. I use a Fujica ST605 screwmount 35mm camera, so whatever the "standard" distance would be for the camera and...
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