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  1. You can use Stellarium to find out about focal length and fov. You can specify your camera chip size and focal length and it will draw a box which will resemble the fov.
  2. Thanks Louise! I wasn`t aware of that flattener. This would be an option. best regards Matthias
  3. Hello Herra, the reasons for me to buy a CCD are actually not so much sensor spec related(although i think omitting the microlenses will have a big impact on QE, binning is also a plus), but they are related to the ergonomics. My goal is to do automated LRGB imaging. Atm in order to obtain color images, i have to screw on each of the filters and refocus, because to my knowledge there is no filter drawer or filter wheel that will fit in my imaging train(i either don`t have enough back focus or the drawer doesn`t fit mechanically due to the "flash" hump). Atm i directly screw the filter between telescope and camera. I have to tighten the connection a bit to get it sufficiently rigid. Each time i exchange filters i have to struggle and torture the filter mount to get it loose again. I fear it`s just a matter of time until i brake my first expensive narrow band filter... Another issue is working distance: My current telescope/flattener has a working distance of 55mm. Screwing on the d5100 and a baader filter already takes me to 65mm which results in bearable field curvature on aps-c sized sensors but it becomes unbearable on FX(tried my D800). From many CCD manufacturers there is a CCD/filter wheel/OAG solution that takes you directly to 55mm(=flat field). Mirrorless cameras would solve this issue though. I don`t know how much you charge for the D600, but also pricewise i would guess that the difference between e.g. a Moravian 11000 and a TEC cooled D600am is not much bigger than a factor of 2 (i would be willing to invest that for conveniences sake). I would be able to do the TEC part myself, but i definitely would not risk debayering something like a D600(one dead d5100 is enough...) best regards Matthias
  4. Hi Herra, the next serious camera upgrade for me will be a CCD(but not in the near future). Most likely one with the KAF16200 chip. As good as the mono dslrs are, the removal of the bayer matrix also removes the micro lenses and my feeling is that the overall quantum efficiency drops significantly. Until i upgrade the d5100 will have to suffice. I recently installed a TEC cooler to the d5100 and i`m curious to see how it performs in the summer months. best regards Matthias
  5. I continued on the IC443 image and made a 2x2 mosaic including IC444. Over 20 hrs integration time during the last 4 months... There are some stitching issues which i might try to solve later.
  6. How did you post process your image? On my screen everything looks fairly dark. Usually the spike only show well on the brighter stars. From the details in the galaxy i would say the image is properly focussed.
  7. Very nice! This is the type of image i`m striving for. I think you didn`t "prize the stuff out with the crowbar", for me it looks still somewhat natural.
  8. IC 1848 with Ha filter during full moon. 9.2 hrs with Skywatcher Esprit 100:
  9. Triggered by Herras narrowband color image, i did a bicolor image of M42 consisting of Ha and OIII. It´s the first time i do this channel combination and i think i have alot to learn The OIII data is lacking a bit which results in this large pattern noise. In contrast to Herras image, my running man is on fire!!!!
  10. Hello, after the meridian flip, which axis ran of the screen? If it was the DEC axis, then maybe you had the setting "Guide North only" or "Guide South only" before. I think most people recommend a recalibration after the meridian flip although i don`t do it myself. The only thing i do is change the position of the counterweights to be east side heavy again. As for the second question: If PHD loses the sight of a star, it should start the guiding process again when the star is visible again ( this is how it works with me and i have standard settings). I´m not sure if it will still work when the cloud persisted a long time and the star has drifted alot on the guider sensor. best regards Matthias
  11. Hello and congratulations to your M31! You didn`t mention it, so i suspect that this was shot without autoguiding right? If you would have an autoguider one could dither between the subs and therefore get rid of the "large" background pattern that i think i see. I also have a question: What flattener did you use? best regards Matthias
  12. Hello, i like your image except for the bluish halo around the stars. best regards Matthias
  13. For all those wishing there was no moon: Just be patient! The moon is slowly moving away from earth
  14. Louise, i think i like a version best that is halfway between yours and mine br Matthias
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