AbsolutelyN Posted April 7, 2021 Share Posted April 7, 2021 Finally the wind died down enough to try the 250PDS last night. It now has an aperture mask installed just above the mirror to help improve flare around stars caused by mirror clips. Many thanks to @tooth_dr for all his amazing help on that. 96x 1min Lum 59x 1min Red 57x 1min Green 52x 1min Blue 4.4 hours. Unfortunately about 2 hours of data lost to a slight breeze. 1600mm pro Example star before aperture mask shows significant improvements. 24 Link to comment Share on other sites More sharing options...
geeklee Posted April 7, 2021 Share Posted April 7, 2021 Stunning Tristan. Great processing too, Holmberg IX very clear with some detail. What a difference in the star flare. 1 Link to comment Share on other sites More sharing options...
scotty38 Posted April 7, 2021 Share Posted April 7, 2021 Wonderful image and is it cropped at all? I know I have a much smaller fl scope but wow yours is huge 🤣 1 Link to comment Share on other sites More sharing options...
AbsolutelyN Posted April 7, 2021 Author Share Posted April 7, 2021 6 minutes ago, geeklee said: Stunning Tristan. Great processing too, Holmberg IX very clear with some detail. What a difference in the star flare. Thanks Lee. Yes really pleased with the reduction in flare, makes a big difference. Surprised Skywatcher don't add something like that to the scope or sell some kind of accessory add on, the PDS is after all for imaging. 1 Link to comment Share on other sites More sharing options...
AbsolutelyN Posted April 7, 2021 Author Share Posted April 7, 2021 (edited) 7 minutes ago, scotty38 said: Wonderful image and is it cropped at all? I know I have a much smaller fl scope but wow yours is huge 🤣 Thanks. Yes it's a crop but M81 still pretty large in frame of the 1600 sensor. The scope is working at 1050mm focal length. Too big for the mount really hence can only use it on very still nights as slightest breeze renders it useless. Edited April 7, 2021 by AbsolutelyN 1 Link to comment Share on other sites More sharing options...
scotty38 Posted April 7, 2021 Share Posted April 7, 2021 (edited) Thanks and yep mine is just under 400 with flattener so as below. Mind you I do get M82 in the fov 🙂 Edited April 7, 2021 by scotty38 1 Link to comment Share on other sites More sharing options...
Adreneline Posted April 7, 2021 Share Posted April 7, 2021 Very nice Tristan - love the colours. Adrian 1 Link to comment Share on other sites More sharing options...
mackiedlm Posted April 7, 2021 Share Posted April 7, 2021 That is a fantastic M81. So much structure in the arms and fantastic colours. Brilliantly don. 1 Link to comment Share on other sites More sharing options...
tooth_dr Posted April 7, 2021 Share Posted April 7, 2021 Very very nice. Must make myself one! Didn’t realise that was the cause of the star flares 😂😂 1 Link to comment Share on other sites More sharing options...
Craig a Posted April 7, 2021 Share Posted April 7, 2021 Yes a big difference in the stars from the mask, lovely image, can you elaborate on the aperture mask I wouldn’t mind making one for my Quattro 10cf during summer ready for autumn 1 Link to comment Share on other sites More sharing options...
tooth_dr Posted April 7, 2021 Share Posted April 7, 2021 1 hour ago, Craig a said: Yes a big difference in the stars from the mask, lovely image, can you elaborate on the aperture mask I wouldn’t mind making one for my Quattro 10cf during summer ready for autumn Its one I drew up and printed for Tristan last week. Tristan gave me the measurements and broke it down into four connecting pieces. Link to comment Share on other sites More sharing options...
AbsolutelyN Posted April 7, 2021 Author Share Posted April 7, 2021 1 minute ago, tooth_dr said: Its one I drew up and printed for Tristan last week. Tristan gave me the measurements and broke it down into four connecting pieces. This works brilliantly, can't thank you enough. It's just stuck on with Velcro. Might just need to centre it better as some stars at edge look to have a slightly flat top but very very minor issue compared to the original flare. 1 Link to comment Share on other sites More sharing options...
Craig a Posted April 7, 2021 Share Posted April 7, 2021 2 minutes ago, tooth_dr said: Its one I drew up and printed for Tristan last week. Tristan gave me the measurements and broke it down into four connecting pieces. Impressive, something I will look at, will have to make mine by hand, would it affect the f ratio of a newt? Link to comment Share on other sites More sharing options...
Xiga Posted April 7, 2021 Share Posted April 7, 2021 That's a very nice M81 indeed! I especially like the colours, they look absolutely spot on. Impressive work for just ~90 mins of Lum. Did you create a Super Lum from all 4.4 hrs of subs? 1 Link to comment Share on other sites More sharing options...
bottletopburly Posted April 7, 2021 Share Posted April 7, 2021 I just had one cut by laser master , just drawtube to trim Link to comment Share on other sites More sharing options...
AbsolutelyN Posted April 7, 2021 Author Share Posted April 7, 2021 1 minute ago, Xiga said: That's a very nice M81 indeed! I especially like the colours, they look absolutely spot on. Impressive work for just ~90 mins of Lum. Did you create a Super Lum from all 4.4 hrs of subs? Thanks, no I usually do that but this is just a straight stack per channel, lum is just the L filters 96 mins Link to comment Share on other sites More sharing options...
Owmuchonomy Posted April 7, 2021 Share Posted April 7, 2021 That's a super image from just down the road. 1 Link to comment Share on other sites More sharing options...
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