SharpCap Forums

Hi Geoff, I think that your analysis is spot on - this looks exactly like periodic error in RA movement (and the direction matches up with the orientation of the camera). The lack of any significant drift in the dec direction and no signifiacant rotation indicates that your polar alignment is pretty...

Hi Bill,

good to hear that the graphics driver update did the trick! I will know what to suggest if the problem comes up again now

cheers and clear skies!

Robin

Hi Brian,

a very cool image - thanks for sharing. There are actually enough stars visible in it to plate solve the image (I tried on just the right hand side to exclude the zoom box on the comet and it worked!)

cheers,

Robin

Hi, OK, I think I have found some more things I need to fix relating to how SharpCap commands PHD2 when there are problems with the guiding 1) PHD2 considers 'Lost Lock' to be still guiding, just not actually able to at the moment. That's why it wasn't happy when SharpCap sent it a 'Begin Guiding' c...

Hi, this is an interesting one... I can't get it to happen myself, although thats probably not a surprise as it only affects one of your systems The extra calculations needed to put the histogram graph into logarithmic form are pretty minimal, so that's unlikely to be causing the issue. I can see th...

Hi, I have had a look at your log and I can see the drift in the data, happening over quite a short amount of time - 30s to 1 minute. The rotation of the earth is not going to have any significant effect over that sort of timescale with the setup you are using with your ASI120MM and a relatively sho...

Hi Eric, yes, I made that change in February, so it will be in the version that you were using. In this case the error seems to be coming from PHD - 'Cannot initiate guide while guide is in progress'. I suspect that the issue is something along the lines of * SharpCap checks PHD state - finds it is ...

Hi, you won't get the full frame rate if you open via the ASCOM Cameras options - ASCOM is really designed for deep sky and the way the camera is controlled via ASCOM means that the frame rate probably won't get much above 3 to 10 fps. If the device is showing up in the 'ZWO ASI Cameras' section of ...

Hi Matt, hopefully the cure for this is as simple as updating to the very latest version of SharpCap 4.1 from our downloads page (https://www.sharpcap.co.uk/sharpcap/downloads). Versions since 4.1.11974 have included an update from ZWO published in March that should add support for your camera. Olde...

Hi, OK, having thought about this a bit, I think I can see a way to remove all the uncertainty about how the mount reacts to the movement pulse in opposite directions. That would leave a possible remaining issue with delays to the apparent movement on screen due to backlash takeup, which could be de...