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New Naked Eye Comet - 17/P Holmes

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16 years 3 months ago #54530 by Seanie_Morris
Replied by Seanie_Morris on topic Re: New Naked Eye Comet - 17/P Holmes
Oh yeah, don't forget - this months target is indeed Holmes for the November Astrophotography Competition... but all submitted entries (and you're only allowed one Kieran!) must be taken during the month.

Seanie.

Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.

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  • daveg
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16 years 3 months ago #54541 by daveg
Replied by daveg on topic Re: New Naked Eye Comet - 17/P Holmes
Paul thnks for keeping such a regular track of the comet. It's obvious from this that the comets (coma) shape is becoming more elliptical. Have you tried using a smaller iso setting. I'm only new to this dslr lark myself but most of the "so-called" experts seem to say that theres no point in going over iso400/800. Seemingly the noise gain is much more than any signal gain you get. Isnt it a pity we cant reduce the iso of the wind.

Dave Gradwell

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16 years 3 months ago #54542 by phoenix
Replied by phoenix on topic Re: New Naked Eye Comet - 17/P Holmes
(and you're only allowed one Kieran!)

Highlander 'There can be only one'

Got ya. Hope you've put that new camera to good use :lol:

Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/

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16 years 3 months ago #54551 by dave_lillis
Replied by dave_lillis on topic Re: New Naked Eye Comet - 17/P Holmes

Isnt it a pity we cant reduce the iso of the wind.
Dave Gradwell


You said it Dave !

Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor

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  • paulevans
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16 years 3 months ago #54554 by paulevans
Replied by paulevans on topic Re: New Naked Eye Comet - 17/P Holmes
Hi Dave,

Yes, in the ideal situation I shoot at ISO800, however the recent conditions have been such that the longer exposures that entails haven't been practical - either because of the wind as you suggest, or because I've had to grab shots through relatively small gaps in rainy clouds and have used a static tripod instead of a driven mount. The ISO3200 of my camera isn't ideal but it's not bad, particularly if I can get a few lights and a dark or two to stack up, and being only 6 million pixels the pixel size is quite big - indeed in regular use my DSLR is no more noisy at ISO3200 than my "bridge" camera - an 8 million pixel Minolta Dimage A2 - is at ISO400!

I'm waiting for some of those crystal clear still nights where I'll be able to get a good stack of 2min exposures at ISO800 and put them all together into something spectacular!

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16 years 3 months ago #54580 by paulevans
Replied by paulevans on topic Re: New Naked Eye Comet - 17/P Holmes
Here's Holmes tonight (Tues Nov 13th)

Firstly the wide view 28mm f2.8 at f4, 6x 30secs, cropped to 75%.



And a closer view 70-210mm "Beercan" lens at 210mm f4 5x 30secs cropped.

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