saturn5 Posted July 25, 2007 Share Posted July 25, 2007 Guys,i took this back in march,a pigggyback job,not very sharp,one of my first tries at it,what i'm curious about is -the nebulosity around the stars is slightly to the right of all of them,what could be causing this Link to comment Share on other sites More sharing options...
FLO Posted July 25, 2007 Share Posted July 25, 2007 I don't think that's nebulosity - what scope were you using? Link to comment Share on other sites More sharing options...
saturn5 Posted July 25, 2007 Author Share Posted July 25, 2007 Steve ,i was using skywatcher 250 on heq5 mount.I was just assuming that it was(probably wrongly).I've done very little astrophotographybut what little i have taken i have not noticed the blue fuzzyness before and just thoughtthat because there is nebulae in the m45 area that maybe i had managed to pick it up,wishfull thinkingIt was a single 30 sec shot. not thru scope but piggybacked.Whatever it is why is it biased towards the right side of the stars Link to comment Share on other sites More sharing options...
FLO Posted July 25, 2007 Share Posted July 25, 2007 I might be wrong but it looks like the colour-fringing often seen thru achromat refractors? Link to comment Share on other sites More sharing options...
Cloudwatcher Posted July 25, 2007 Share Posted July 25, 2007 Could it be a combination of an overexposure issue and drift of the subject? The 'blue fringe' only seems apparent on the brighter objects and if there is also a slight 'drift' in the image the affect will show more on one side.(Unless you really have got a 250mm achromatic refractor! )CW Link to comment Share on other sites More sharing options...
FLO Posted July 25, 2007 Share Posted July 25, 2007 C,mon then, end the suspense, what were you using? Link to comment Share on other sites More sharing options...
Cloudwatcher Posted July 25, 2007 Share Posted July 25, 2007 C,mon then, end the suspense, what were you using?I worked on the assumption that the gear used was the Minolta Dimage piggybacked on the Skywatcher 250mm Newt' referred to in saturn 5's earlier post. Course I could be wrong.......It has been known! CW Link to comment Share on other sites More sharing options...
FLO Posted July 25, 2007 Share Posted July 25, 2007 Ah yes, you are probably right Link to comment Share on other sites More sharing options...
moondog Posted July 26, 2007 Share Posted July 26, 2007 Your camera won't have an apochromatic lens so you'll get some blue colour fringing on bright objects. Focus is a bit soft as well which will make it worse.The off centre colour fringing is strange, it's normally equal around the object. If it was an achromatic scope I would think that it could be slightly out of collimation - but a camera ?. Daft thought, but I suppose that you could try a shot of a bright star and defocus the camera to see if you get off centre Airey rings. MD Link to comment Share on other sites More sharing options...
Greg Posted July 26, 2007 Share Posted July 26, 2007 Looks like bit of condensation to me...??Os scope slightly out of collimation...?? Link to comment Share on other sites More sharing options...
Ant Posted July 26, 2007 Share Posted July 26, 2007 Could be a little Dew on the lens. That has some very strange effect to the final image.Ant Link to comment Share on other sites More sharing options...
saturn5 Posted July 26, 2007 Author Share Posted July 26, 2007 Thanks for the help guys,i am planing a new dslr but that is another minefield,which camera :?i'm also after a laptop so i can have starry night at my shed..i mean obbo :lol:fed up with leafing throughstar charts.Any tips on the which camera,preferably not much more than £500 or my bank manager(wife) might stop my pocket money. Link to comment Share on other sites More sharing options...
stargazer1980 Posted July 26, 2007 Share Posted July 26, 2007 No expert, but from the posts ive been reading on here, you could try a canon 350/400D or even a nikon D40! Ive heard that most prefer the canons!Darren There both around the £400-£500 mark Link to comment Share on other sites More sharing options...
mpeniak Posted July 28, 2007 Share Posted July 28, 2007 Could be a little Dew on the lens. That has some very strange effect to the final image.AntCould this be caused by dew as well please?http://stargazrs.com/mpeniak/image/805_large.jpegMartin :-D Link to comment Share on other sites More sharing options...
barkis Posted July 28, 2007 Share Posted July 28, 2007 Could be a little Dew on the lens. That has some very strange effect to the final image.AntCould this be caused by dew as well please?http://stargazrs.com/mpeniak/image/805_large.jpegMartin :-D Looks like a Supernova to me Martin. Ron. Link to comment Share on other sites More sharing options...
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