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  #21  
Old 06-07-2011, 01:23 PM
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Tiotion (Jack)
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Thanks Marc! I have a new desktop pic!

Stunning object and excellent capture!

Cheers
Jack
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  #22  
Old 06-07-2011, 06:26 PM
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multiweb (Marc)
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Quote:
Originally Posted by avandonk View Post
Nice images Marc. I had a play with star reduction with ImagesPlus in the blue and red channels of your LMC image. Must have been a reasonable dark sky site.

Large image here 6MB

http://d1355990.i49.quadrahosting.co..._12_SRrb_L.jpg

You would get better than this without the far UV.

A UHC-S filter would cut the UV and increase contrast. Try mounting your 48mm UHC-S infront of the lens. This would also act as an aperture of about 43mm and would give you about f/4.6. A Hutech 58mm LPR filter with an open aperure of 53.4mm would get you f/3.75. Most of the CA comes from the outer part of any lens. Even my 300mm Canon lens has slight red and blue at perfect focus from IR and UV as photo lenses are not designed for IR and far UV only visible.

A good LPR filter would also cut the UV.

A longer lens hood would also increase contrast due to to light outside the image area scattering inside the lens that adds to apparent sky fog. A front aperture also stops light from even hitting the inside 'walls' of the lens.

I have been imaging with the one lens (Canon 300mm F2.8L) for years at a light polluted site and have managed to improve by all these little methods that by themselves seem negligible but when added together make all the difference.

Hope this gives you some ideas to try.

Bert
Thanks for all that good info Bert. Taking in on board and will try next outing.

Quote:
Originally Posted by Tiotion View Post
Thanks Marc! I have a new desktop pic!

Stunning object and excellent capture!

Cheers
Jack
Thanks a lot Jack - I have one too on mine
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  #23  
Old 07-07-2011, 09:43 AM
Ross G
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Hi Marc,

What amazing wide fields. I love all the detail and the subtle colours.

Great photos.


Thanks.

Ross.
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  #24  
Old 07-07-2011, 09:58 AM
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I think I like the SMC out of the two. I like the composition and the way you captured the globs. Although some shorter subs for 47Tuc would have really nailed the look. There is some pretty savage star shapes throughout the image and I am sure this has come from being wide open. f4 might have been better to produce nice round stars.

Not sure about the star colours in the LMC shot. There are some pink stars present throughout the image.

Overall both look good and it is only the little things, that can be seen.
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  #25  
Old 07-07-2011, 11:56 AM
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multiweb (Marc)
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Quote:
Originally Posted by Ross G View Post
Hi Marc,

What amazing wide fields. I love all the detail and the subtle colours.

Great photos.


Thanks.

Ross.
Thanks Ross. How did you go with yours?

Quote:
Originally Posted by Paul Haese View Post
I think I like the SMC out of the two. I like the composition and the way you captured the globs. Although some shorter subs for 47Tuc would have really nailed the look. There is some pretty savage star shapes throughout the image and I am sure this has come from being wide open. f4 might have been better to produce nice round stars.
Thanks Paul. Savage is the right term yep. Still a lot to learn. All good points you've made there and that I am aware of.
Quote:
Originally Posted by Paul Haese View Post
Not sure about the star colours in the LMC shot. There are some pink stars present throughout the image.

Overall both look good and it is only the little things, that can be seen.
Yes, I have to refined my processing on those pink halos. I think I've got it right on the latest stuff. Might repro this one later on. I also have a 2" Baader fringe killer on the way.

Last edited by multiweb; 07-07-2011 at 02:54 PM.
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  #26  
Old 07-07-2011, 08:24 PM
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Hi Greg, what's a minus violet filter? I have UV/IR cuts. UHC-S and one U filter (fully block visible and IR).[/QUOTE]


A minus violet filter blocks out the violet false colour. I have never used one but know of their use.

Often used by Achromat owners to reduce false colour (out of focus blue/violet).

Greg.
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  #27  
Old 08-07-2011, 03:55 PM
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multiweb (Marc)
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Quote:
Originally Posted by gregbradley View Post
Hi Greg, what's a minus violet filter? I have UV/IR cuts. UHC-S and one U filter (fully block visible and IR).

A minus violet filter blocks out the violet false colour. I have never used one but know of their use.

Often used by Achromat owners to reduce false colour (out of focus blue/violet).

Greg.[/QUOTE]

Got a Baader fringe killer in the mail. Will check that out first.
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  #28  
Old 08-07-2011, 04:15 PM
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Very nice views of the MCs, Marc. Thanks for the views.
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  #29  
Old 09-07-2011, 08:40 AM
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Very nice views of the MCs, Marc. Thanks for the views.
Thanks again Lester.
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