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michael8554
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Everything posted by michael8554
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PHD2 Settings for iOptron CEM120
michael8554 replied to bluesilver's topic in Discussions - Software
The Dither setting is totally dependent on the image scales of the guide and imaging cameras. So nobody can help you until you supply those details. Michael -
Help ! Meade LX 10 Electronic Focus Options
michael8554 replied to Moonwrecker's topic in Discussions - Scopes / Whole setups
Something like this ? Michael -
Can you polar align using your guide scope?
michael8554 replied to 5haan_A's topic in Getting Started General Help and Advice
Hi Jim The PA routine in SharpCap is popular and fast, but has some requirements: "The camera must be supported by SharpCap. The cameras field of view should be 1-2.5 degrees. You need to see at least 15 stars in the FOV. You need to be aligned within 5 degrees of the pole (rough polar alignment) -
Increase or decrease distance to camera query
michael8554 replied to assouptro's topic in Imaging - Discussion
Look at the star shapes in the corners of a sub. If they're round then change nothing. If they're elongated, pointing towards the centre of frame, try a few more mm of spacing. If the elongation is circular about the centre of frame then try a few mm less spacing. Michael -
The usual Meade 0.63 reducer requires 105mm of back focus. The Altair 183C has a 12.5mm flange distance. So there's a 105 - 12.5 = 92.5mm gap that needs filling with spacers and the derotater. The derotater looks heavy, so place that close to the OTA. Michael
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As Soon as I Launch PHD2 -- RA and DEC Go Nuts
michael8554 replied to johnfr's topic in Discussions - Mounts
Hi John Post the PHD2 GuideLog from the PHD folder. Check the date in the file name is relevant Michael -
Going to 3.76um pixels from 8.5um pixels means the poor star shapes are now being fully displayed, instead of being inside one 8.5um pixel. So an undersampled image scale of 3.9arcsec/pixel is hiding the problem, not fixing it. Michael
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I can believe a new CC/FR might have cured the problem, but pixel size affecting coma/pinched optics/astigmatism ? Michael
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Possible to image planets with a DSLR?
michael8554 replied to Olli's topic in Getting Started With Imaging
Large DSLR FOV isn't a problem, just crop, ends up as a similar size in pixels that a Planetary camera would produce. Similarly LiveView 5X Movie will give about 1200 x 800, depending on camera. Michael -
PHD2 responds to Dither commands from external software. The external dither setting may already be in imaging camera pixels. Or it may be the amount the guidecam is being dithered, requiring an adjustment to the PHD2 multiplication settings to translate into image camera pixels. Believing the Algorithm settings have anything to do with Dithering suggests you need to step back and read the PHD2 Instructions. Michael
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Possible to image planets with a DSLR?
michael8554 replied to Olli's topic in Getting Started With Imaging
Hi Olli Here a description on how to do non-compressed non-interpolated video with Canon DSLRs: https://www.astropix.com/html/equipment/canon_one_to_one_pixel_resolution.html Michael -
Guiding…..what is going on here please
michael8554 replied to Andywilliams's topic in Getting Started With Imaging
No dip in the guidecam output. PHD2 is reacting to an external input to Dec and to RA. I notice your Minimum Move settings are a tiny 0.05, was that recommended by the PHD2 Guide Assistant ? And setting the Y-Axis to arcsecs give a more accurate account of the guiding than pixels. You could post the PHD2 GuideLog for more information on your setup. Michael -
How many pixels are you dithering the ASI1600MM ? 12 pixels is a common figure. The dither needs to be in imaging cam pixels. With some imaging software it might be in guidecam pixels, requiring a calculation to give the correct dither for the imaging cam. Michael
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Hi Ade OAG's require more sensitive cameras than will work with a guidescope. So I'd avoid a colour camera, and I found the non-mini ASI 120MM not sensitive enough for OAG use. Both cameras have 4.9mm x 3.7mm sensors, so will be a poor size-match to a 12mm x 12mm prism. But many people successfully use sensitive cameras with that size sensor on 8x8 and 12x12 prisms, they're just not a good match to the prism size. Michael
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Hello Peter. I found an ASI 120MM not sensitive enough for my SCT and OAG. Michael
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Allen key screw is stuck in telescope need some help..
michael8554 replied to Olli's topic in The Astro Lounge
The secret to loosening tight screws is to tighten them first ! A tiny clockwise turn results in a "click" as the galling is broken. Also the loosening side of the socket edges isn't being damaged. Failing that the next techniques have been well described. Michael -
Going back to the start, I notice exposures are only 1 second. The RA problem might be as simple as "Chasing the Seeing" Michael
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Specific Reducer
michael8554 replied to Stargazer66's topic in Getting Started General Help and Advice
Here's my FOV with a Canon APS-C DSLR and a 8" SCT at f/6.3: Any of the Celestron, Meade, Antares etc f/6.3 SCT Reducers will do. Michael -
Hi Noodles Gather those cables into a loose loop and attach to the mount. You'd be surprised how tracking can be affected by cables dragging on the ground. Michael
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Hi Stuart, A good description, but we need a jpeg of the whole of a short exposure sub, stretched if necessary, to best judge the issue. And/or crops of all four corners. Michael
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Hi Danan Your shots look blurred, probably due to atmospheric turbulence - like looking at a coin on the bottom of a swimming pool. Take lots of shots at the fastest shutter speed that gives a fairly good exposure. Some of those shots may be "lucky", taken at an instance when the air was still. For this reason Planetary Imagers usually use dedicated video Planetary cameras, taking long duration video files at fast frame rates. Stacking software then picks out the frames that aren't blurred. Michael
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- astromaster 130eq
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