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Found 80 results

  1. Hi all,just wanting to pic someone's brains.. As normally with a DSLR imaging during a full moon seems to be a waste of time and as a Ha filter cuts throu the l.p. a little,is it possible to do some HA narrowband imaging with a DSLR? I have a 12nm Ha filter,would that work or does the bandwidth have to be narrower to cut the l.p. out.. so it be like a Ha,rgb image..Or is this just for the ccd owners?
  2. This is 63 x 300s with a 7nm Ha Altair filter, so a total of 5 hours and 15 minutes. It needs much more and perhaps some longer subs too before I start collecting the O3 data to go with it.
  3. Hi all, I wanted to buy my first narrowband filter. I decided on a 7nm Ha filter. Among the options, there were the Baader 7nm and the Optolong 7nm. I chose the Optolong even though I heard that the colour ones are Astronomik copies. However, I searched some comparisons between the Baader and the Optolong and the Baader seemed to have some halos. I decided on the Optolong. However, I don't have a proper imaging camera and for a while I'll be testing it with the ASI120MM I have. Plans for a larger sensor camera. Yesterday I received the filter and had some tries on M42. My balcony window opens to NEE so M42 is a tough target. I can only point the scope to it on EQ mode only before it reaches 15deg. So I had to switch to AZ mode where a scope can reach almost out of the balcony with the counterweight bar extended. Very good AP setup. Anyway, I attached the ASI120MM to a Tair3s lens, wide open this time at F/4.5 and put them on the AZ-EQ5 in AZ mode. ~40x10s + 70x2s. Gain 70/100. With calibration files. I don't know what to try this evening if it's clear. What do you think about putting the camera on a 135 F/2.8 lens and drizzling 2x? Did anyone of you try drizzling and had a successful result? Clear skies, Alex Edit: I don't know what I've done to have the white frame, I didn't notice it until now. It was probably after combining the 10s image with the 2s one.
  4. Not posted for a bit, but I did recently capture some half way respectable OIII data for the Crab, which I've here combined with some Ha/S/Lum data from last year - some of it reprocessed. This is with the C9.25 with reducer and Atik 460, which I think gives a nice image scale for this object if you want to see the pulsar properly and a bit of structure (but don't bother at this scale without an off-axis-guider). Colourful Ha(red)/S(green)/O(blue) palette :-). (About 12 hours all in) Tim
  5. Hi guys, Managed to get some OIII data to go with my previous Ha of the Rosette nebula, still very short (only 7x900 sec. frames of OIII) but it's strating to look nice, it really brings a new dimension to the image, not too happy with the blue halos though, once I have more OIII data I will reprocess, the weather is looking good today...let's see https://www.flickr.c...eposted-public/ Cheers,
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