m39 i think?

[jonnyboy]

taken last night i was expecting more. should i of taken longer exposures?

jb

[Andrew*]

Lovely image there of what seems to me to be an open cluster, which I can't imagine getting much more interesting than that. Got a bit of vignetting going on there. No idea how to solve that <coughPHOTOSHOP!!cough>

nicely captured. How long was the exposure, and what scope and camera were you using?

AP

[jonnyboy]

100ed and svxh9. i think it was around 15 secs

jb

[FLO]

The image shows strong posterisation (looks painted with few tones/shades).

Is the original like that?

[robindurant]

Strange white line across your image. Sat or Aircraft ??

Robin

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[jonnyboy]

don't know what the line is. could be ET or my wife throwing something at me?

steve, that is the original image it could have something to do with the dew i was having big problems last night with it.

jb

[jonnyboy]

here's one stacked

jb

[CELESCOPE]

Hi JB a lot of vignetting as been said . what was the set up etc ,as for exposures ,u wont need much for clusters unless you are seeking any nebulosity that may surround them , even a single exposure would be enough , but short exposures maybe about 20 to keep the noise level down or a single one of 10 mins .

Rog

[jonnyboy]

cc, it was the 100ed and svx h9 the exposures were around 15 seconds. how do i avoid vignetting?

jb

[Caz]

A super image there JB! 8)

Oh and Happy birthday... :occasion6:

Caz

[CELESCOPE]

what adaptor are you using is it the inch and a quarter one , if so try a shorter one to get the chip closer in ,i ended up filing mine down bit by bit

Rog

[jonnyboy]

Thanks for that caz.

cc, i have the shorter one on order.

jb

[CELESCOPE]

JB i,m not CC heheeh i,m Rog #

[jonnyboy]

OK Rog, is it common practice to use a barlow with deep sky ie star clusters and would i need to use it on some galaxies.

jb

[CELESCOPE]

certainly not for clusters , maybe on globs though with your ED 100 and ccd , its not that Great a field , so i would have thought that open clusters and globs and even smaller galaxies would be fine , u can use a reducer then to get an even wider field of view , for the larger nebula and galaxies , M31 would be a task thought to get fully in , i can only just get it in with my ed 80 AT f5 .

Rog

[jonnyboy]

thanks for that rog.

jb