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About michael8554

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    Sub Dwarf
  1. Go-to - (old) Celestron fork

    Ah, brings back memories of trying to add a Dave Ek Push-To to a Meade LX6 - if only I'd had a 3D printer....... Michael
  2. I think this gives the answer. https://www.cloudynights.com/topic/563763-nebulosity-manual-demosaic-setup-for-pentax/ The figures are for a Pentax, so follow his link to the A7S figures and do the math :-> Michael
  3. Attach M42 camera lens to CCD

    To get infinity focus you will need to space the lens 45.46mm OR LESS from the CCD surface. Slightly short is good as it means you can actually find infinity focus before you run out of adjustment. Because of poor machining tolerances you can often use the cheapest M42x1.0mm Extension Tubes to get your spacing. Michael
  4. f ratio for guidescopes

    Late last year there were simultaneous discussions on this very subject on the Open PHD Guiding Forum and on the Stark Labs forums, which had input from the PHD2 coders. They settled on : 0.2 x guide pixel size x 1000 / imaging pixel size You haven't specified which DSLR you have, but for 3um the guide focal length would be 250mm, for 4um it's 187mm, for 5um it's 150mm, for 6um it's 125mm. So the 183mm finderscope, if that is it's FL, is well worth a try. You will not need adjustable rings to find a guidestar, so bolt it down solidly front and back. As Louise has said, avoid the weight of an ST80 or the 70mm F12 as you will only get flex - we're talking microns here. Michael

    Tick the boxes mentioned by owmuch... and also select arc-secs instead of pixels. The guidelogs are in the phd folder. Michael
  6. Autoguiding CPU requirements

    For guiding only, as kirkster suggests a low speed XP computer is sufficient. However, for high frame rate planetary imaging you need a much higher spec as Altair and Ken suggest. Michael
  7. Focus the sun (that bright object sometimes seen in the sky) onto a non - combustible surface and get the missus to measure where 400mm is on the lens. Or a combustible surface to relive those long- forgotten childhood days. Heavy rollers are only needed for Australian Test wickets....... Michael
  8. Following my popular "Stargazing on La Palma" thread, two coaches set of up the mountain for a daytime visit. About halfway there the visit was cancelled, a red alert for high winds meant no pedestrians allowed. The coaches rearranged into those who wanted to go to the top of the mountain but staying in the coach, and those who wanted to go back. The coach going up wouldn't restart. Got going up and reached the top. 5 minutes of clear blue sky before the clouds turned it into a 5 mph crawl. Back at the ship the captain announced that Lanzarote and then La Coruna in Spain were closed due to weather. We're going home with more money than when we left...... Michael
  9. Stargazing on La Palma

    Correct, but our trip was only to 1100, possibly no suitable coach parking further up? Yes, we're in Gran Canaria now, warm but cloudy again. Michael
  10. Stargazing on La Palma

    That's very unlucky. Michael
  11. Down loading new phd settings

    A quick count from memory came up with 9 variable settings, I certainly can't remember what they're set at, maybe you can :-) Michael
  12. Camera problem(s) with Windows 7 laptop

    I had similar connection problems with an earlier Celestron Niightscape camera. It seemed to need two drivers installed, ascom and another. There were then two instances in Windows Device Manager usb tab. Unless its because it's a usb3 camera in a usb2 hole. Michael
  13. DDS problem see photo

    Have you tried registering only ? If it completes that then next try stacking. Michael
  14. Stargazing on La Palma

    On the cruiseship Sapphire with guest lecturer Pete Lawrence of Sky at Night fame. We're going up the mountain with the world's largest telescope on. 360 clear nights a year apparently. Only not tonight - trip cancelled. Don't tell me, the UK is clear tonight......... Michael
  15. The LX80 is one of Meade's attempts at an EQ mount. It seems to me they all have problems and quickly go out of production and are replaced with another with a higher model number. Whereas the LX90 goes on and on. I would have thought 900 Euros was nearer the price for the 90, look at the prices here on SGL and ukastrobuyandsell. Michael