My little window...

CCD vs Film? Lots of time vs no patience? Alright, this is your place to discuss all the astrophotography what's and what's not. You can discuss about techniques, accessories, cameras, whatever....just make sure you also post some nice photos here too!
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Sivakis
Posts: 240
Joined: Mon Aug 10, 2009 12:55 pm
Favourite scope: Astrotech AT66ED APO

Re: My little window...

Post by Sivakis »

kimo wrote:nice image. did you tried camera lens?
Thanks kimo and Airconvent

Yeah, I've been doing camera lens imaging all along, that last was the first on a scope.

There's definitely an obvious difference between imaging with a 55-250 Canon EF-S lens and the AT66ED refractor.

55-250 @ 250mm (or 400mm on a 1.6x crop - Canon 1000D)
ISO 1600
1.6sec x 87 frames
Image

AT66ED @ 400mm (or 640mm on a 1.6x crop - Canon 1000D)
ISO800
1sec x 50 frames
Image

The refractor is definitely dimmer simply because of the longer FL, coupled with my deliberate lowering of ISO to 800 to lessen the noise.

I also seem to find it harder to achieve focusing on the refractor compared to using just the camera lens. Not sure why this is so though.

Either way, my RA motor is arriving later this month so that should expand my exposure considerably. I'll definitely re-visit Omega Centauri again once that's here.

kimo
Posts: 408
Joined: Fri Oct 01, 2010 9:26 am

Re: My little window...

Post by kimo »

Thanks for sample. recently bought 80-200mm F/4.5 lens. I realised that its too slow to imaging. as I set at 80mm it should be F/4.5 right but the result didn't looks f/4.4 or near. now I purchased Prime lens 135mm with F/2.8 (on the way). lets see if it is good enough.

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orly_andico
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Location: Braddell Heights
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Re: My little window...

Post by orly_andico »

Most lenses need some stopping down for good results.

My 70-200/2.8 has curvature and coma off axis. Will try it stopped down to f/3.2 next time..

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Gary
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Re: My little window...

Post by Gary »

Nice job Sivakis! Prefer the brighter shot. Keep shooting! [smilie=good-job.gif]
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"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.

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Sivakis
Posts: 240
Joined: Mon Aug 10, 2009 12:55 pm
Favourite scope: Astrotech AT66ED APO

Re: My little window...

Post by Sivakis »

Finally took delivery of my CG4 motor and gotten it pretty much polar aligned at home! Phew, talk about hard work.....

Messed around for a few nights until I get a semi-decent series of shots!

Astrotech AT66ED
Canon 1000D filter removed
50 x 25sec
ISO 1600

NGC 6231 (Northern Jewel Box)

Image

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Sivakis
Posts: 240
Joined: Mon Aug 10, 2009 12:55 pm
Favourite scope: Astrotech AT66ED APO

Re: My little window...

Post by Sivakis »

Another take on the Northern Jewel Box, portrait orientation:

Image

DarthCryder
Posts: 95
Joined: Tue May 21, 2013 11:28 pm
Favourite scope: Nikon 85mm/f1.4 lens

Re: My little window...

Post by DarthCryder »

nice C76!

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Sivakis
Posts: 240
Joined: Mon Aug 10, 2009 12:55 pm
Favourite scope: Astrotech AT66ED APO

Re: My little window...

Post by Sivakis »

Thanks Darth!

Didn't really like that previous one... think I overdid it (think?? Haha, I know I did....) with the magenta and reds....

Another try at the post-processing stage...

Image

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Sivakis
Posts: 240
Joined: Mon Aug 10, 2009 12:55 pm
Favourite scope: Astrotech AT66ED APO

Re: My little window...

Post by Sivakis »

Trying to process 6231 taken from across different nights.

Can anyone help with why I'm getting this line across the image in DSS? The individual frames are clean by themselves but this error comes up after stacking....

Image

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PETER LOO
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Joined: Mon Sep 20, 2010 9:05 pm
Favourite scope: TS APO Refractor

Re: My little window...

Post by PETER LOO »

Very nicce Prawn Nebula (IC 4628) Sivakis, esp the 2nd last pics, it looks very much alive ..

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