Achieving very precise focus using a Bahtinov mask visually is difficult. But using a grabber program to measure your error and make further tweaks can put you...
70935
CurtisC
die_nullte
Apr 3, 2012 6:58 am
I found it quite easy with my scopes. It's certainly better than watching dancing "brightest pixel" values. I like FocusMax, but I don't think the OP should...
70936
Mike Dodd
doddm2001
Apr 3, 2012 1:08 pm
... I have remotely used MaxIm and my focuser's control software to achieve good focus by manually emulating FocusMax. I choose a star, make a test exposure,...
70937
Emile-Marie Pulinx
epulinx
Apr 3, 2012 2:31 pm
Hi everybody I learned years ago that temperature changes during the night can cause focal shift of the scope. But,oddly, I never noticed that was for...
70938
echesak@...
echesak...
Apr 3, 2012 2:31 pm
Funny about masks... I started focusing my Tak, with Maxim and the stock manual focuser. I would take for ever to settle to a value that I felt was the...
70939
Ron Wodaski
rwodaski
Apr 3, 2012 2:32 pm
I use roughly that method before I get FocusMax working on a new system. Ron Wodaski...
70940
Ron Wodaski
rwodaski
Apr 3, 2012 2:35 pm
Which just goes to prove that no one method for _anything_ works for everyone. We all have our preferences. One's zeal for manual or motorized or remote...
70941
Stan
stan_ccd
Apr 3, 2012 3:11 pm
... Indeed. That unique CCD uses a special 4 field read method that interleaves the pixel circuits so that non-neighbor pixels can be binned. It is a fairly...
70942
Stan
stan_ccd
Apr 3, 2012 3:19 pm
... For a better assessment, calculate the read noises normalized for pixel size and also compare QE. If the camera is primarily or only for guiding then the...
70943
Stan
stan_ccd
Apr 3, 2012 4:05 pm
... But a large area guide-chip can be potentially useful if the guiding apperatus is difficult to aim relative to the main FOV and has a slow f-ratio. e.g. a...
70944
Michael Miller
vpcirc
Apr 3, 2012 5:03 pm
Don Goldman (Astrodon) told me that I should refocus my refractor every 30 minutes during the first 4-5 hours of the night as the air cools, and I kept mine...
70945
Michael Miller
vpcirc
Apr 3, 2012 5:04 pm
Well said, those of us fortunate enough to be on a fixed pier and have complete automation would find it very difficult to manually mess with things. I guess...
70946
photonphisher
Apr 3, 2012 5:10 pm
Hi Stan, Thanks for your inputs - very good points. My OAG gives me a small window and that I can pan around, so perhaps the bigger chip is not really...
70947
Ken Harrison
ken4optics
Apr 3, 2012 5:21 pm
I believe the Lodestar uses the same Sony chip as the DSI II, but based on my experience it is much, much, more sensitive. This must be due to the different...
70948
phils67
Apr 3, 2012 8:38 pm
The original PC specification, still followed by modern PCs, was set up to support two parallel printers. You may be able to locate a bus card that supports...
70949
Bob Runyan
runrob68876
Apr 3, 2012 8:55 pm
Thanks for your insight Phil: I may have to look into this further. Bob R. ... From: ccd-newastro@yahoogroups.com [mailto:ccd-newastro@yahoogroups.com] On ...
I have posted a new version of a short video of my recent astrophotos at http://www.photodex.com/share/hapgriffin/w4gccmg4 Be sure to click the “full...
70952
Ron Brant
astroron2001
Apr 4, 2012 8:37 pm
Nice presentation Hap. Excellent images! Ron ... From: Hap Griffin To: ccd-newastro@yahoogroups.com Sent: Wednesday, April 04, 2012 1:09 PM Subject:...
70953
Peter
fxdwg123
Apr 4, 2012 10:08 pm
Hap, that is a great movie! Chapeau, the movie is great, but even better with Pink Floyd, I cranked up volume as advised. Thanks....Peter... I have posted a...
70954
marcjousset
Apr 4, 2012 10:08 pm
Hi all, I would like to share a new image with my RHA. PK164+31.1, also called Jones Emberson 1, is a very faint planetary nebula in the constellation Lynx....
70955
Michael Miller
vpcirc
Apr 4, 2012 10:23 pm
Beautiful work Michael D Miller CEO VP Services ... [Non-text portions of this message have been removed]...
70956
eburnemark
Apr 5, 2012 5:34 pm
Hap - outstanding work, both imaging and presentation. For me very motivational. Nicely done. Mark Eburne Vancouver BC...
70957
marcjousset
Apr 5, 2012 9:56 pm
Many thanks Michael ! Marc...
70958
Bob Runyan
runrob68876
Apr 6, 2012 4:21 am
Hello Hap: Very nice and inspirational presentation. I looked at the media program you used and had a couple questions. Did you have to resize your images...
70959
Hap Griffin
hapgriffin01
Apr 6, 2012 11:34 am
No re-sizing required. Proshow Gold has all the tools you need. Hap From: Bob Runyan Sent: Friday, April 06, 2012 2:21 AM To: ccd-newastro@yahoogroups.com ...
70960
larryl
lmleitch02
Apr 6, 2012 11:51 pm
Everybody, I have made a great improvement by following the simple steps taken from ...
70961
Stan
stan_ccd
Apr 7, 2012 3:43 pm
... That is the common method. ... Probably the measuring algorithm as affected by noise and seeing distortions. Don't worry about it. ... That method should...
70962
Bernard Miller
bgmiller_01
Apr 8, 2012 4:56 pm
Hap, Very nice. What software did you use to make the video? Thanks, Bernard From: ccd-newastro@yahoogroups.com [mailto:ccd-newastro@yahoogroups.com] On Behalf...
70963
Bernard Miller
bgmiller_01
Apr 8, 2012 4:56 pm
Marc, Very nice image. It reminds me a little of the Dumbbell Nebula. Bernard From: ccd-newastro@yahoogroups.com [mailto:ccd-newastro@yahoogroups.com] On ...
