Last night I had good conditions in my backyard in Castro Valley. So while others spend a perfectly good evening getting a crummy, but scientifically...
Really nice shot Richard! Very Hubble like. I didn't know you had started shooting with an AP180. Quite a variety of scopes you have been through. Kevin ......
... Thanks Kevin I bought the 180EDT f/9 about a year ago. I really like it. I've cut back the scope inventory: I have the AP180EDT and the AP155EDT f/7 and...
This is from my recent outings at Fremont Peak. I get maybe four hours sky time from astronomical dark until this one disappears into the hills. I managed to...
On Friday night while John Gleason and I were battling rapidly deteriorating weather conditions on Fremont Peak, I managed to snag 5 x 20 minutes of [SII] and...
Richard Thanks for sharing these images. Quite remarkable. Your dialogue gives additional insight, thank you! One question: This may not be relevent to...
this is another from Thursday night at Fremont Peak. This was shot at the end of the session: was 2 x 20 minutes racing the daybreak. instead of sleeping I...
Hi Tom To answer your question first requires a statement of the goal of the final image. In my case I am not interested in star colors but am interested in as...
we had a surprisingly good run of nice weather the past few nights. I started a multi-night project to image M17. I have never taken a good M17 image so I...
Many of us have been using narrowband filters for imaging nebulae, both Halpha and tricolor emission line. There are numerous reasons to use the technique for...
Well, that's the same intent of this group. Folks are more than welcome and encouraged to post images, discuss techniques and various filter equipment. Do...
I just added a folder named Black River Observatory and uploaded my first Ha image; The Bubble Nebula. I shot this earlier in July. Exposure is 2x30 min. using...
the other group is focused solely on narrowband filters and not RGB etc. perhaps it is redundant. This group has little traffic but the new one has more. It...
... At 300 x 200 nearly all images look good. You may have uploaded a higher res version but for some reason Yahoo only lets the owner of the image see the...
I was able to create a new folder (Black River Observatory) in the files section but whenever I try to upload the image, a page-not-found error occurs. I tried...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the Astroimaging_filters group. File :...
Astroimaging_filters@...
Jul 29, 2005 5:54 pm
833
... files section but whenever I try to upload the image, a page-not- found error occurs. I tried 3 times. I'm on dial-up so it's a PITA to keep trying. Any...
Last December I bought a set of Astrodon narrowband filters (50mm unmounted, ha, o3, s2) i was initially surprised how different they felt the first time i ...
I changed the file name to remove space and got the same error. Not sure what the problem is. ... From: rdcrisp To: Astroimaging_filters@yahoogroups.com Sent:...
look in the Black River Observatory folder It is a very nice image. Frank should be proud. Now we just need to figure out how to fix things so he can upload...
Thank you! ... From: rdcrisp To: Astroimaging_filters@yahoogroups.com Sent: Saturday, July 30, 2005 11:44 AM Subject: [Astroimaging_filters] Frank Uroda's...
I just wanted those on this list who do not sse the posts on the SBIG group to know that Stan Moore, one of the most respected names in quantitative...
Like some of us I am not a member of the SBIG group, and have not read these responses. I must confess I am missing the point somewhere. When I first read...
Tom, the problem is that Richard's CS H-a filter has 65-72% througput compared to 90% for the 6 nm FWHM narrowband and is thus considerably less efficient. It...
Don if you want anyone to take you seriously you should be able to fight your own fights instead of relying on standing on the shoulders of another person. You...
I made a short powerpoint presentation last week that attempts to teach the issue I raised about the importance of the resolution bandwidth of the instruments...
If you're going to attack the technical competence of a CalTech Ph.D. regarding spectal scans of filters, you might want to learn the difference between...
... Ph.D. ... Ph.D. ... i'd hope that you would have learned how to calculate s/n but apparently you haven't Don. Anyone can get a sheepskin but applying it is...
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