M45

[saturn5]

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

[FLO]

I don't think that's nebulosity - what scope were you using?

[saturn5]

Steve ,i was using skywatcher 250 on heq5 mount.

I was just assuming that it was(probably wrongly).I've done very little astrophotography

but what little i have taken i have not noticed the blue fuzzyness before and just thought

that because there is nebulae in the m45 area that maybe i had managed to pick it up,wishfull thinking

It 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

[FLO]

I might be wrong but it looks like the colour-fringing often seen thru achromat refractors?

[Cloudwatcher]

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

[FLO]

C,mon then, end the suspense, what were you using?

[Cloudwatcher]

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

[FLO]

Ah yes, you are probably right

[moondog]

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

[Greg]

Looks like bit of condensation to me...??

Os scope slightly out of collimation...??

[Ant]

Could be a little Dew on the lens. That has some very strange effect to the final image.

Ant

[saturn5]

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 through

star charts.

Any tips on the which camera,preferably not much more than £500 or my bank manager(wife) might stop my pocket money.

[stargazer1980]

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

[mpeniak]

Could be a little Dew on the lens. That has some very strange effect to the final image.

Ant

Could this be caused by dew as well please?

http://stargazrs.com/mpeniak/image/805_large.jpeg

Martin :-D

[barkis]

Could be a little Dew on the lens. That has some very strange effect to the final image.

Ant

Could this be caused by dew as well please?

http://stargazrs.com/mpeniak/image/805_large.jpeg

Martin :-D

Looks like a Supernova to me Martin.

Ron.