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About michael8554

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    Sub Dwarf
  1. michael8554

    Flats and Meridian Flip

    Mark, I meant how does DSS handle Flats being different orientation to pre and post flip images - that's if the camera is inverting, which you havent confirmed ? Michael
  2. michael8554

    Flats and Meridian Flip

    I have a fork mount so I'm finding it hard to visualise a flip. You're saying that the camera is inverted after the flip? So if there's a bunny at top left, and a galaxy at bottom right before the flip, then after the flip the bunny and the galaxy will be in the same corner? So how does DSS handle this? Michael
  3. As Michael HFW says the primary to secondary distance is crucial to the coma performance. But are you imaging out to the edges of the field? If not 5mm of mirror movement might not impact on the area you're using. Why not try it, counting the screw turns so you can get back to normal ? Michael
  4. michael8554

    My PHD2 graph[Problem]

    Stick with ST4 for the moment but check that binning is 1x1. Recalibrate with the new setting. I see that Cal on the taskbar is yellow instead of green which I think means there is a problem - did you get an error message at the end of Calibrating? Try exposures of 1 and 2 secs. Michael
  5. michael8554

    Flats and Meridian Flip

    Flats are to do with "imperfections" between the front of the OTA and the imaging chip. You could take the ota and camera (together) off the mount and take your flats indoors (in theory). Same with Darks, take the camera off the OTA, cap it up, and take your Darks the next day, if you have setpoint temp. So flip doesn't affect either. Michael
  6. michael8554

    ZWO ASI 120MC-S - cannot see anything

    I'd also suggest that you didn't manage to point accurately enough at Jupiter to get Jupiter onto the small imager chip. You have to align your finder and the imager very accurately on say a moon crater. The act of swapping between an eyepiece and the camera will likely throw you off target. Michael
  7. michael8554

    My DEC is running away from me

    1. Why is Dec heading off so quickly ? Is your PA that bad? You could run Guiding Assistant before imaging, this will report your PA, as well as best settings for that night's seeing. 2. PHD2 is issuing longer and longer corrections but the mount isn't moving. This could be the mount trying to overcome stiction, but I think if it was that the last big correction would have unstuck the dec and sent the mount hurtling over to the other side of the axis. Instead it goes nicely back to the axis. So PHD2 is just taking up backlash that has become apparent in that scope orientation. Then the poor PA immediately sends Dec off on a trip again. Loose Az adjustment? Michael
  8. michael8554

    T3i Modification Issues

    Have a look online at the Martin Pyott non-invasive Peltier mod for the 600D. Makes a big difference on hot nights. Michael
  9. michael8554

    Help! 550d disassembly problem

    One tip that applies to all tight screws - try TIGHTENING a tiny bit first. This often breaks the lock with a faint click - then loosen as normal. I've removed those screws on many Canons with PH000 no problems. Michael
  10. michael8554

    T3i Modification Issues

    Highest temperature I've seen on a T3i (or 600D) is 28C on ISO 800 5 minute subs, so 42C may well be a problem. Michael
  11. michael8554

    Weird shaped stars in some light photos

    Movement appears to be N-S rather than E-W. Assuming you're set up as a EQ mount rather than an AZ, then Dec is deviating, not RA. so possible due to high Dec backlash. You haven't said if you're guiding ? Michael
  12. michael8554

    PHD2 options

    PHD2 Polar Align quickly gets you roughly right after setup. PHD2 Static Polar A!ign gets you to about 5 arc mins. That's good enough to guide on, particularly if you have a lot of Dec backlash, you can then guide in one direction only. If you want better than that, PHD2 Drift Align. Michael
  13. michael8554

    Free Android app - APT DC

    Thanks guys, very usefull. Asus ZenPad 10 Michael

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