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Bobby1970 last won the day on February 6 2014

Bobby1970 had the most liked content!

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About Bobby1970

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    Proto Star

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  • Location
    Royal Wootton Bassett, Wiltshire
  1. Been away in Cornwall for a week, just outside of Marazion. First night there was nice and clear and i had the benefit of a roof terrace/balcony so set up the Star Advenurer, Sony A57 and Minolta 50mm lens. I was having issues polar aligning initially but think i was somewhere near, however i then had issues with power supply intermittency. Its either a dodgy USB cable or the socket on the SA itself. Anyway all i managed was 18mins worth of 20s shots at iso 3200. If i had more dark nights i would have had another crack but alas none were as good as the first night. Visually, naked eye was a treat too tbh. Milky way easily visible and M31 with averted vision also. I used DSS, Startools and Topaz to end up with this effort. Thanks for looking.
  2. Very interesting thread this is. I've been using my AZGti along with ASIAir Pro recently. I guide it using a small guidescope and 120 mini. I had some backlash which seemed to affect my images and guiding performance so I disassembled the mount and removed as much of the backlash as I could. Last time out I lost no subs at all guiding at 180s. I use a 72mm semi apo scope and zwo 178mc camera. My most recent effort was this :-
  3. I was hoping for some more sharpness in general tbh. It's come out ok don't get me wrong. The lens is a well regarded 50mmlens but I'm sure I read something years back about it being sharper from f4 upwards. But forgot when I captured this image. Lol.
  4. I think I should have stopped the lens down a bit more. Might try at f4 or higher next time.
  5. Been looking at some so called "silent" fans so it sounds like I have options there. I did fire it up this afternoon and pointed the scope at a distant chimney pot. The image seems nice and stable so fingers crossed vibration isn't going to be an issue. Away on holiday from Friday so will pick this back up after then.
  6. Very nice looking scope. My 72mm Altair has same marks on the focusser. Good luck with sale.
  7. Thanks for the info @Gina. With my "testing' so far mine seems to run cooler with the fan the opposite way around. ie pulling air from the heatsink out to ambient. I am awaiting on a dew heater for the front end to hopefully help with the sensor window fogging. If this all works I will then look at some temp control with the intention of a target of 3-5 degrees. I will then be looking at a quieter fan and/or speed control for the fan and checking for any vibration issues with the image the camera produces. I read a little about heatsinks and their jest dissipation ratings. I do wonder if there's a way to avoid using s fan altogether with an appropriate sized heatsink tbh. However, I am making all of this up as I go tbh. But it has been good fun so far. Ps, glad you are back.
  8. It wasn't so noisy until I swapped it around. I wonder if it's pulling air through, and around the heatsink find and fixing screws?? Going to try reducing the speed at some point and add temp ctrl.
  9. Noted on the "no fan" idea. Thanks guys. I could stick a variable resistor in line with the fan I guess and reduce the speed to an acceptable noise level maybe, while still cooling the heatsink. I just wondered if the fact that the heatsink is 40x40x20mm, it may have been enough without the fan. I'm just making it up as I go tbh. Lol
  10. I am wondering if I can run it without the fan. Need to do some more testing. See how it goes without it. Made some more of the foam insulating jacket. Had some thin self adhesive black foam left over from something so.covered the insulation around the main body with that too.
  11. So, today I started with some insulation around the main part of the camera body and pit the camera on test for around ten mins. Insulation around the main body seemed to do a good job, need to make some smaller bits for around the rest of the camera and heatsink/peltier as there was still moisture there. Sensor window still fogged up temp 3-4 Deg after 10 mins or so. Next I reversed the fan so it was pulling air from the heatsink and out into the ambient air. Within 10 mins the temperature had gone from an initial 20 odd Deg. Down to sub zero. . There was actually frost on the rear of the camera lol. It leveled off at around -0.2-03 Deg. Sensor window still fogged up. My current conclusion is. 1) I still need some sort of dew heater for the front of the cam. 2) I will deffo need some temp control lol. And 3) the fan may be too loud. Lol. PXL_20201011_134946962.mp4 PXL_20201011_134946962.mp4
  12. thats certainly worth exploring. I have a dew heater wining its way to me so will be working more on the cooler during the week i would think.
  13. looks very similar to the one i got
  14. i think i have maybe clipped it a little, you are correct, im still fairly happy with it
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