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12-30-2013, 05:17 PM   #571
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QuoteOriginally posted by seti_v2 Quote
i like the color balance on the reprocessed on ExFinn! M42 is such a bear to process, too much dynamic range in it.
Thanks.
That is a different image from a lot better seeing night. I also resorted to using a light pollution filter (Lumicon Deep Sky filter), made a huge difference in eliminating sky-glow from sodium lights.
And yes, M42 has a wealth of data to capture and process, specially for a beginner like me.

p.s. I might be hooked on astro...


Last edited by Ex Finn.; 01-01-2014 at 11:42 AM.
12-31-2013, 09:48 AM - 1 Like   #572
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with 50 mm f/1.4

Hello everybody,

Here my last shots with my K5 + O-GPS1 + 50 mm f/1.4, near Toulouse (France) :

Pleiades - M45 & NGC 1499


27/11/2013
Stack: 3 images ISO 400 F2.8 (2 x 120 sec + 1 x 300 sec)

Andromeda Galaxy - M31


28/11/2013
Stack: 6 images
- 3 images ISO 800 F2.0 (3 x 60 sec)
- 3 images ISO 3200 F2.0 (3 x 30 sec)

Orion - M42


28/11/2013
Stack: 3 images
- 2 ISO 400 F2.0 (2 x 60 sec)
- 1 ISO 200 F2.4 (1 x 60 sec)

All the best for 2014!

Chris A.
01-23-2014, 11:20 AM - 2 Likes   #573
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M82 SN2014J Supernova

Only got off one 60" exposure at the telescopes native f-ratio (f10) before clouds came in and obscured my view. Hope to get a much better set of exposures soon.
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01-23-2014, 02:40 PM   #574
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Seti: nice capture. I read there was a supernova in M82 but didn't have a chance to look . Brighter than I thought. Thanks for posting so soon. Good luck on your next try
Hank

01-23-2014, 02:54 PM   #575
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Congratulations from me too to seti_v2. Clouds and noise or not, this IS a very fine capture!
01-23-2014, 07:43 PM   #576
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Nice, Seti. First clear night I will be trying for M82. Next week will be better as we close in on New Moon. The feeling is that if anything the supernova should brighten for the next few weeks.

Jack

Last edited by jbinpg; 01-23-2014 at 07:57 PM.
01-24-2014, 09:27 AM   #577
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Very good shot for such short time exposure. Can you tell what aperture, and ISO?
01-24-2014, 11:53 AM   #578
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QuoteOriginally posted by JimmyDranox Quote
Very good shot for such short time exposure. Can you tell what aperture, and ISO?
Celestron Nexstar 8se
Aperature 203.2mm
Focal length 2000mm
f/10 ratio
used with Meade 4000 series broadband light pollution filter

Pentax k5
Bulb mode, 60sec timer through pk tether, DNG raw, ISO 1600, auto white balance.

01-28-2014, 09:21 AM   #579
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QuoteOriginally posted by DRabbit Quote
In some of my own research on this topic, the big key is avoiding star trails (unless you want them). The wider the lens the better. There's a formula...

600 focal length = exposure time (in seconds) to avoid star trails.

So for example... I shot some with the Samyang 14mm f/2.8 lens. It's effective focal length is 21mm on the Kx (the camera I was using at the time).

600 21mm = 28.5 seconds.

So I shot at 30 seconds, wide open, ISO 1600 or 3200.

These aren't the most beautiful results, but it was my first attempt!









I'm looking forward to trying this again with the K-5... once I get a nice wide lens again
WOW!! Amazing!
01-31-2014, 09:31 AM - 1 Like   #580
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M82 SN2014J Supernova

Finally got a bit of clear weather.

Pentax k5, 17 x 180sec exposures, flats and darks

Celestron Nexstar 8se, f10, 2000mm f/l, 203.2mm aperature

ZWO ASI120MM guiding camera on Meade offaxis guider

Meade LPR Broadband filter.

Link to animation with a before shot from June. seti-v2: Photo
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02-01-2014, 05:29 PM   #581
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A K-3 shot of SN2014J from last night is here:


https://www.pentaxforums.com/forums/172-pentax-k-3/244417-k-3-astrophotography-2.html


Perhaps it would be better to have a camera model-agnostic astro thread?

Jack
02-01-2014, 06:56 PM   #582
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QuoteOriginally posted by jbinpg Quote
A K-3 shot of SN2014J from last night is here:


https://www.pentaxforums.com/forums/172-pentax-k-3/244417-k-3-astrophotography-2.html


Perhaps it would be better to have a camera model-agnostic astro thread?

Jack
that kind of thread would be great! I'd live to see how all the Pentax line does!
02-01-2014, 07:38 PM   #583
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QuoteOriginally posted by seti_v2 Quote
that kind of thread would be great! I'd live to see how all the Pentax line does!
You mean like ? Astrophotography - PentaxForums.com
02-01-2014, 10:52 PM   #584
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Ah, forgot about the social groups. I suppose this is the way Adam preserves the camera model structure of the forums but lets us play around all we like in the groups. Thanks for the heads up.

Jack
02-04-2014, 09:26 AM   #585
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I'm not sure if this is the proper thread to ask for advice, or if it's only for sharing results... so apologies if this is misplaced.

I've noticed from browsing this thread that many of you use the Pentax GPS1 and get some good results for tracking. I recently purchased a K-5 II and a Vivitar 13mm f/2.8 with the intent of doing some wide field astrophotography while on vacation in Mexico.

Some of my expectations:

-Initially, I want to capture wide-angle views of the Milky Way and stitch it (if necessary) with a long-exposure shot of the rocky beach where I'll be staying in Mexico, and with other landscapes
-Eventually, I'd like to move onto imaging with longer focal lengths such as 70mm, 200mm, and possibly higher. I never plan on mounting a telescope to the mount I choose (if I go the Polarie or Skytracker route)
-When I get back to Cincinnati, there is a lot of light pollution but I'll also do most of my future imaging from here. I'm relatively clueless as to the efficacy and cost of integrating light pollution filters onto Pentax lenses.

Information about my current gear:

-Manfrotto tripod with integrated (non-removable) ballhead and quick release plate. Has 1/4" and 3/8" threads available. Has no bubble level
-Pentax K-5 II
-Vivitar 13mm f/2.8 (same as Samyang/Rokinon 14mm)
-Pentax 70mm f/2.4

My questions:

-Can any of you compare the pros and cons associated with the Vixen Polarie, iOptron Skytracker, and Pentax GPS module for astrophotography? I've read lots of reviews for all three, but can't nail down the best option for my needs.
-Are there any needed, or simply helpful, accessories that I should have to pair with my current gear? Light pollution filters, tripod heads, etc...
-Should I ditch my current tripod, with its integrated head, in favor of tripod legs that can be fitted with removable heads? I was looking at this Benro Classic

Thank you so much for any help given, as it's much appreciated to get some advice from Pentax users on this daunting foray into AP.
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