I began this over the July 4th holiday and took my most recent data last night, Aug 3 This is 12 hours of [SII], 10 hours of [OIII] and 7 hours of Halpha It...
Hi Richard, I did some experimentation last night imaging M20 with my MX716, f3.0 C9.25 (filters ahead of focal reducer), and a number of narrowband filters....
Richard, I had the same problem a couple of years ago with the 1.25" filter drawers. Again I think there is a similar problem with the consistency of filter...
Hi, I have been thinking about my narrowband filters, a dangerous thing to do? We rush to image with the narrowest band filter available, but totally discount...
i've been requesting 6 decade semilog plots for some time now Richard I think the calls have been ignored because some have something to hide.... ... From:...
Hi Richard, I fully support you on the requirement for specs from the vendors, however.... Some time ago I asked for specs as spreadsheets or similar. The...
Hi, I just saw this interesting data on the Baader 7nm Ha filter, see: http://www.astrodon.com/documentation/documentation.cfm?DocID=14 It appears to support...
Hi Richard, take a look at : http://www.samirkharusi.net/spectrograph.html The guy has done some interesting experiments with good resilts. I guess this is the...
Hi Dieter, thanks for the reference. I checked with Alpine Astronomical and they believe they can get and sell me the Baader grating in the 1-1/4" filter cell...
Hi Dieter, I located some other references to making a spectroscope. One has the slit directly in line with the physical axis of the optical assembly. See the...
I forgot to include the GRISM link, see: http://www.regulusastro.com/regulus/papers/grism/index.html Regards, Richard ... spectroscope. ... 20ASSEMBLY ... to ...
Hi Richard, thanks for this one. I am currently in the process of building the 'shoebox' design of Samir. I'll be using wood instead. Most interesting my...
Hi Dieter, that looks expensive, do you know the price? I have seen some fiber optics spectrometers where most of the hardware does not need to be on the...
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@...
Aug 21, 2007 2:13 am
1560
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@...
Aug 21, 2007 2:25 am
1561
I got Astrodon filter scans today from Thomas Baader. Last week some of you may remember that Don Goldman published some data regarding NIR leakage in the...
As I mentioned in a previous email, the method that Don Goldman said he used to measure the NIR leakage from his and Baader's 7nm Ha filter involved shining a...
Hi Richard, come on, do you really believe that his flashlight varied by 27.5? He reported an IR leakage of 364 ADU for his filter and 10,022 ADU for the...
Hi Richard, a member of the new group I recently joined: http://tech.groups.yahoo.com/group/amateur_spectroscopy/ did have a valid question about my TV remote...
Richard, Although I agree that a standard light source is ideal, there are a few issues that you have not fully addressed in your analysis: 1. The spectral...
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 :...
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Aug 21, 2007 2:35 pm
1569
figure 2 shows the proper way to display a filter's passband if you want to see ultimate rejection. this is what the industry should be showing....
Richard, I believe that my point about the insensitivity of silicon-based chips to NIR in the greater than the 1100nm range is valid. So the graphs that you...
Hi Richard, thanks for the link. I'm still undecided about a spctrometer. The French project of a kit seems to be interesting. The one I mentioned runs around...
Hi Dieter, is that spectroscope the LHIRES III? I was looking at it, but see that the kit is no longer available. You found one on eBay? Narrowband filters may...
Richard, for all of your smarts, and for all of your alleged accomplishments, your style of dealing with people has crippled your effectiveness. I have known...
... but ... so if i understand your comment, other than casting doubt over my numerous accomplishments of which you are obviously both envious and jealous and...
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