I have been using the [SII]/Ha and [OIII] set from Baader lately with the 300mm Pentax medium format camera lens (f/4) and mounted on the IMG6303E here are...
this is 7 x 20 minutes of Halpha taken using the Dream Machine on the 18" cassegrain with focal reducer (F=3366mm). The big pixels of the TK1024 really gather...
Hi Richard, can't you say anything more here? I am mostly interested in astronomical coherent light issues, not using the polarizing filter as a neutral...
The image was taken using the Stinger 450 classical cassegrain, and the IMG1024S Dream Machine camera using 4.5nm Cust Sci narrowband filters. Total exposure...
Hi, over 3 months ago I ordered a Astronomik (Gerd Nummann) filter drawer holder with two 2" and two 1-1/4" filter holder drawers from AVA. I received the...
I knew making and reporting on workaround Gerd Neummann 2" filter drawers would do the trick. Just got a call from AVA that my four 2" filter drawers have...
Hi, I understand that theoretically an H-beta filter is redundant if already imaging with a narrowband H-alpha filter. That holds for a perfect Ha filter....
Richard, If I'm not mistaken, if you take your H-Alpha image and layer it over the blue channel, and then change the layer mode to lighten and turn down the...
H-beta is useful for a visual filter since it is close to the eye's peak low-light sensitivity. At low levels, H-alpha is nearly invisible -- even at 10-20% of...
Hi Ed, you make a very interesting point. I have been doing amateur astronomy for over 40 years and I'm still learning, but I'm now just beginning to...
It's even worse than the DSLR case. The latter matches the eye's response in normal illumination, where the cone receptors in the eye provide color vision. The...
Hi, this may sound like looking for a left handed smoke shifter. I am looking for a source to buy a 2" filter wrench. I received my Gerd Neummann filter...
Hi Jerry, thanks for the reply, but I don't think that style wrench would work. The wrench I need must fit down into a depression in the filter drawer to go...
Hmm. If you're thinking of taking the filter apart, you could saw/file a notch in either side of the ring, then use a flat metal sheet like a giant screwdriver...
Hi Jerry, I turned down the too long portion of the SII filter. It gave me a chance to try out a 4-jaw chuck for my minilathe to hold the square Astronomik...
I emailed Baader and suggested that they design and supply a filter wrench that would uniquely fit their filter rings. I'll report back what they tell me. ...
I heard back from Baader. Bottom line, they though the idea of a special filter wrench was interesting and they will consider it, however they said that the...
Hi, does anyone here have any experience with the Orion H-beta filter? Does anyone know who makes Orion's 12nm bandpass H-beta filter? I just purchased a 2"...
Hi Ed, I came across an interesting reference today. The reference shows the relative response of the Canon 350d to different light wavelengths, see the...
Hi, my next crazy idea, use an H-beta filter as a near OIII continuum filter. Would the following steps work? 1. Image an object in Ha 2. Image the object in...
Hi Richard C, on your webpage you say: "The naturally occurring ratio of Halpha to Hbeta is approximately 2.92 to one". I assume that is the energy flux and...
Hi, this post may be a waste of time since nobody seems to be interested in this group, but here goes. I have been confused on the actual pixel count...
Let me first address your initial question. it is easier for me to send email to this group but i'll post directly and hope it works the photons are emitted...
Method to measure the H-beta to H-alpha ratio?? Hi Richard, thanks for your reply. I guess then the next question is if a CCD camera A/D counts is proportional...
The ccd camera counts photons directly. If you use a very narrow Hbeta filter and look at an emission nebula then you will essentially count the Hbeta photons...
my article is in print now in Amateur Astronomy (issue #55) I received a PDF of it earlier in the week. Unfortunatly there's not an easy way to provide the...
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