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GTom

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About GTom

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    Star Forming
  1. Thanks Adam, that's a great shot! Proper cooling is certainly a witchcraft i have to learn...
  2. Is the 1000D a good camera to practice on, if the ultimate goal is a 6D? Shall I expect the same issues?
  3. If founds are restrictive, I would suggest a second hand nikon d5100 instead (good FW hack - no star eater, lossless RAW) Canons with reasonable efficiency are costy. And almost forgot: the d5100 has a fully articulated screen:))
  4. Heard about nex5, it should be doable. Grab a few spare sensors from ebay to stay on the safe side.
  5. If RGB can be shot (LP allows) I see little sense to do H-beta, but correct me if I am wrong...
  6. Thanks for all the responses! True, the H-beta needs a strong UV excitation = nearby O or B type star, which are quite rare. I may skip investing in a photographic H-b for the moment.
  7. Does it make any sense to shoot H-beta along H-alpha for narrowband imaging? They are both arising from the same element, although I don't know whether their ratio remains the same for all emission nebulae...
  8. Wow, that's interesting . I need to grab a 1$ sensor for that test - however, that doesn't prove that a 6D sensor would survive the icing + thermal shock. Actually I could avoid icing by blowing argon on the sensor until it's room temp again, the question is just, if anything cracks in the sensor stack (electrodes, optical pad)?
  9. Interestingly the qhy sibling of the ASI camera doesn't show much amp glow. I do not question the fact, that the 11k is a "real estate" chip (btw its red=H-alpha sensitivity is around 30%), if you want to cover several square degrees, you don't have too much other choice. Maybe monochrome modded+cooled canon 6D, but that wont really be better, due to the loss of microlenses...
  10. No Idea until I know how much work and what kind of scope you used. QE and noise problems can be balanced with longer collection - what I am curious about is, how much more exposure time would an Atik11000 vs a 460exm need for a small target. Time is a precious commodity for most of us.
  11. Thanks, that looks much more detailed then my approach!
  12. Depending on pricing, the mkII can bring down the mkI prices a bit. Otherwise I doubt the new model would smash the current offering (6D, nikon D600, sony a7s) in AP: even if canon finally makes its move away from their 500nm process, then they'll probably go along the MegaPixel marketing, and use up all the improvement to squeeze more pixels on the sensor. Besides, the 6D line is not that expensive that they'd put a groundbreaking miracle sensor in it (stacked BSI anyone?).
  13. For AP cooling can make a huuge difference. In a stock DSLR, dark/thermal noise is in complete control over IQ. At ~20°C, even the canon champion 7DmkII shows 0.1e-/s/pixel, which eventually adds up to 12e- over a 2minutes shot or ~3x more than the relevant readout noise. If you cool, you'll see a wast difference, all of a sudden ISO1600 becomes an actually usable value on this venerable cameras.
  14. Sensorgen.info says that the 1100D has better readout noise than the 1000D. Better readout noise means better stacking.
  15. If you stay with the Sky Newton, one thing is sure: going FF is a complete waste of money, you are spending hundreds of ₤/€/$ on sensor area, which never see a photon from the sky. Only a few, AP-oriented (large secondary + 3" focuser) Newtons can light up a FF sensor. I'd probably get a QHY163m or ASI1600mm-cool for your scope. OTOH, if you also plan a scope upgrade - which is quite an undertaking, not just financially - there is room for e.g. a 6D. I recently bought and converted a 6D after doing rounds of research: it wasn't an easy decision, because I was also a die-hard Nikonian and never had canon gear before, but I don't want star-eating, or any other nasty surprises popping up after the purchase - like it does in case of the a7s "miracle" (they don't exist, right?) sensor. With Nikons, tight bayonet/mirrorbox is an issue, they will vignette more even after mirrorectomy, the sony doesn't have a mirror but its bayonet is even tighter.
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