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Peter Withey

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Posts posted by Peter Withey

  1. I have fond memories as a schoolboy in the 1970's,  trying to image the moon through my 3.5 inch Tasco Newtonian Reflector (yes 3.5 inch Newt) with a Pentax K1000 SLR. I never understood why it wouldnt focus with the camera lens removed and using the telescope as the lens ( I didnt now about lack of infocus in Newts). I was thrilled when I managed to get some blurry crater pictures , effectively using eyepiece projection - though i didnt know what i was doing. Of course there were no connectors or adaptors to connect scope and camera - which  made the whole thing even more hit and miss!  We are so spoilt nowadays

  2. Another point to bare in mind - is the blue end  (shorter wavelengths) of the spectrum , including 0iii, will always be inherently softer,   as it is scattered by the atmosphere to a greater extent than the red end (longer wavelengths) ,including Ha.  This is particularly apparent at longer focal lengths eg when planetary imaging.

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  3. I'll  throw my latest attempt into the mix...Captured on 18July with Ganymede in shadow transit. I have only just got round to processing it.

    There was  slug of high pressure over the UK at the time and the air was particularly still - so thought i'd better make the most of it! The Mewlon was reluctant to cool in spite of a fan blowing down the tube for several hours. I experimented a bit by blowing the fan down the tube in between exposures too - and I think this helped to scrub the boundary layer - so I managed to capture many sharper frames  before it reformed. ...

    When is an image actually finished? I never know when to say - 'that will do' , there always seems to be another tweak which changes the image but then I can't decide if its an improvement or not! Also Isn't it crazy how we capture tens of gigabytes of data and distil it down to an image of just a few kilobytes! 

    Tak Mewlon 210, ZWO224MC, 1.6 Barlow. Sharpcap, Pipp, Autostakkert, Registax, (12 * 120sec videos) DeRotated in Winjupos , Photoshop.

    Jupiter18July2021.jpg

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