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Uranium235

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Uranium235 last won the day on November 14 2017

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About Uranium235

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  1. Ahh, my bad didnt see it was mount related - but even so trying to gain 4min+ just through modifications to a stock mount seems... optimistic at best. You really have to shell out some cash if you want top notch unguided imaging.... if I remember rightly one of our (now sadly departed) members (Per) used to do everything unguided - but he had everything modelled right down to the finest detail. Quite right on the histogram, I personally leave a gap of 20 - as even though that "gap" looks like there is nothing in it - it can actually contain faint nebulosity or dust that would otherwise get clipped.
  2. Hang on.... stop right there...lol. No camera modification on Earth (apart from increasing the pixel size) can influence the maxiumum length of an unguided sub... that is determined by both the mount and the focal length of the optics. With a 130pds, you would be lucky to get 30s unguided without trailing (@ 1x1bin). You might be able to get longer unguided @650mm, but that takes a lot of fiddling. Just wanted to clear up that bit of mis-information
  3. If you live in London, then its going to be narrowband imaging only im afraid (if you want any hope of a good image). Keep the star adventurer, buy a fast lens (eg: like the samyang detailed above), a lightweight cooled CMOS camera + some filters. Should come to less than your budget. Edit: Just need to add that your choice of camera needs to be mono
  4. The SW 0.9x will be problematic when you point it at anything bright. Try taking an image of M45 with it and you will soon find out Remember, the review posted earlier is based on using an F4 newt - which will always be next to impossible to get flat over a 22mm diagonal for your average imager. However when you apply something like the Baader to an f5 130pds, the results are much more consistent. Its entirely possible to (just about) get round stars over a KAF8300 using the Baader MkIII (example below)
  5. A bit of late night Ha imaging NGC6820 Just 90min, I'll pick this up again in a few weeks when I wont have to wait so late for it to clear the tree.
  6. A bit of messing around for an hour last night (LRGB) :
  7. Astonishing photos... I had the same issue with a 200pds, great replacement focuser - rubbish baseplate. So I designed my own as you did, but I had it 3D printed instead. When designing, have a think about how it will all attach to the tube. Might be worth uprating the bolts to M5, and where the nut goes on the inside - a flexible placstic washer or something simlilar to spead the contact area of the nut out a bit more (flat nut on a curved surface is never good).
  8. By killing all star colour in Ps: Filter > Noise > Reduce noise Strength: 10 Preserve detail: 10 Colour noise reduction: 10 Sharpening: 0 You can either apply that to the whole image, or on a star selection only.
  9. Here is the (stretched) master flat taken with that panel, looks fairly normal... apart from the excessive amount of motes...lol
  10. Depends on whether your camera has a shutter or not. The QSI does (as is usual for KAF8300), so I usually give it at least 3 seconds per flat - hence the need to dim sufficiently
  11. When it turns up, you will notice it has a grid pattern on the illuminated side. That will disappear once you put a few sheets of A4 on it - you probably need about 3 or 4 sheets to dim it sufficiently enough for lum flats on its lowest setting. For narrowband just hit the power key once or twice to increase the brightness (you have three levels). It runs fine for ages from a small powerbank
  12. This is it mate https://www.amazon.co.uk/Portable-Adjustable-3-Levels-Brightness-Animation/dp/B07GSVB7RR
  13. More than one way to skin a cat on this one, personally I would create a fake background (with fake noise) and bursh it in with a layer mask - blend mode ligthen (so the stars dont get touched). Takes practice, but it can rescue a project from the bin.
  14. FYI, the lightbox I used was this - 14 quid from amazon: I then created a protective cover and OTA attachment using the box it came in, and a bit of foam oh, plus 3 sheets of A4 to further dim and diffuse the light. The pic shown is with it on max brighness, I've only used the lowest setting so far on lum data. NB will probably require it to be kicked up a notch or two in brightness. Its amazing what you can do with a bit of glue and tape Probably needs a bit more tape around the edges, just to make it star party friendly.
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