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Comet NEOWISE from Normandy, close-up with Samyang 135
Lens: Samyang 135 f/2 Camera: K-1 Mark II ISO: 800 Shutter Speed: Above 6s Aperture: F2 
Posted By: Dan Paris, 07-21-2020, 11:41 AM

Hi,


last night I drove away from Paris' light pollution dome and stopped the car in the middle of the countryside in Normandy, the sky was quite dark there. One can even see some faint galaxies behind the comet.








Pentax K-1 Mark II + Samyang 135 f/2

17*10 sec at ISO800 (+dark, flat and bias frames)

Stacked and color calibrated with Siril




regards,


Dan
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07-21-2020, 04:06 PM - 1 Like   #2
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This is so impressive, wow. You've just given me a very good reason to take astro seriously and get into proper technique, frame stacking and such... it's inspiring. Thanks for sharing!
07-21-2020, 04:25 PM - 1 Like   #3
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I must agree with Serkevan as I am personally at a loss for words. Many,many thnx for posting. This shot is so incredible, I would not hesitate sending a copy to NASA, or any other agencies.

Cheers,

tt
07-21-2020, 08:10 PM   #4
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Only one word-Spectacular!!

07-21-2020, 09:02 PM   #5
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I saw this elsewhere and was amazed. Technical perfection.
Well done!
07-22-2020, 12:11 AM   #6
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That is absolutely amazing! I need to try harder with the star-tracer on my K3!
07-22-2020, 09:42 AM   #7
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Thanks a lot Servekan, Tony, dmjjr, Mike and Rob for your kind words,

Dan
07-22-2020, 05:57 PM   #8
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Love it! When you say dark and bias frames, you mean you shot with exposure bracketing right?

Can I assume you used astrotracer to get a 10second exposure on a 135mm lens?

Thanks, just trying to pick up some tips for when I venture out to "shoot for the stars" ... literally

07-23-2020, 02:49 AM   #9
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QuoteOriginally posted by K5-0 Quote
Love it! When you say dark and bias frames, you mean you shot with exposure bracketing right?

Can I assume you used astrotracer to get a 10second exposure on a 135mm lens?

Thanks ! Yes I did use astrotracer I forgot to mention it....

The calibration frames are as follows:

Dark frames: same exposure and ISO as your comet shots, lens cap on (to remove thermal signal from the sensor)
Flat field frames: shot an evenly illuminated target (I use an electroluminescent panel) at base ISO, with correct exposure (to correct accurately vignetting)
Bias frames: shortest exposure at base ISO, lens cap on (to correct the zero value of each pixel). They are needed for an efficient use of flat field frames.
07-24-2020, 01:03 AM   #10
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Very impressive!
07-24-2020, 09:04 AM   #11
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Outstanding!! Congrats - something to be proud of for sure!

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07-24-2020, 09:25 PM   #12
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Spectacular. I can't find it in the sky.
07-25-2020, 07:59 AM   #13
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thanks a lot for your kind comments !

Dan


QuoteOriginally posted by mroeder75 Quote
Spectacular. I can't find it in the sky.

It is not as bright as it used to be. It is roughly under the Big Dipper (Ursa Major). A pair of binoculars helps a lot
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