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Cygnus wide field with Nikon Z6

astrophotography
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#1 AstroBobo

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Posted 14 July 2019 - 04:20 AM

Hello all,

 

a few days ago I finally tested my Z6 with the Nikkor 50 mm S lens. Here's the image, 20x2 min exposures, ISO 800 and f/5.6. Images were converted to .tif with Nikon Capture NX-D, then stacked and processed in PixInsight. Absoluteny NO noise reduction, and the camera is not modded. Because of this, the red nebulae had more of a magenta tint, so I corrected it in PS to look more natural. Also, I reduced the star sizes with morphological transformation in PI. This is excellent performance for an unmodded camera. And the lens is super sharp even at f/4, but this was tracked on a Star Adventurer mount, so I opted to close down the lens.

 

Feel free to take a look at the larger resolution on Astrobin. The image was taken from the newly designated international dark sky park Petrova Gora, Croatia. I measured 21.52 with my SQM (non  L).

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  • Labud_Z6_mali.jpg

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#2 james7ca

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Posted 14 July 2019 - 04:39 AM

That's a very nice looking image with good color and sharpness. I'm surprised that you didn't get any diffraction spikes when you stopped down to f/5.6. Was that done with the internal lens stop or with an external step-down ring?



#3 whwang

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Posted 14 July 2019 - 05:16 AM

Very nice.  Thank you for sharing.

 

I am still curious why you stopped it down to F5.6, if F4 is totally good.  If you used F4, the noise would be even lower in the final stacked image.



#4 AstroBobo

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Posted 14 July 2019 - 06:04 AM

That's a very nice looking image with good color and sharpness. I'm surprised that you didn't get any diffraction spikes when you stopped down to f/5.6. Was that done with the internal lens stop or with an external step-down ring?

 

Regular in-lens stopping down. The lens has circular blades, so there aren't any sharp edges for the spikes to form. They are not that obvious on wide and normal angle lenses anyway.

 

Very nice.  Thank you for sharing.

 

I am still curious why you stopped it down to F5.6, if F4 is totally good.  If you used F4, the noise would be even lower in the final stacked image.

Because the lens is even sharper at f/5.6, so why not? With modern DSLRs and mirrorless the noise is so low, I don't worry anymore.



#5 Traveler

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Posted 14 July 2019 - 06:39 AM

+1 "This is excellent performance for an unmodded camera"

Indeed!

 

Also good to know there is a dark sky park in Croatia...



#6 james7ca

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Posted 14 July 2019 - 07:10 AM

Regular in-lens stopping down. The lens has circular blades, so there aren't any sharp edges for the spikes to form. They are not that obvious on wide and normal angle lenses anyway.

Still seems unusual, the aperture blades must be particularly smooth and circular.

 

For example, below is a cropped sample from my 50mm Nikkor prime lens stopped down to f/2.8. This is about three minutes of exposure using an APS-C camera, it's the belt of Orion (detail crop from an image that covered most of Orion).

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  • Diffraction Spikes Nikkor 50mm Prime Lens at f2_8.jpg

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#7 AstroBobo

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Posted 14 July 2019 - 07:20 AM

+1 "This is excellent performance for an unmodded camera"

Indeed!

 

Also good to know there is a dark sky park in Croatia...

Thanks! We worked hard for this...although there are other darker places in Croatia, Petrova gora is important because it's relatively near the capital, Zagreb. Perfect timing, too, as we have also enacted a new light pollution law.

 

Still seems unusual, the aperture blades must be particularly smooth and circular.

 

For example, below is a cropped sample from my 50mm Nikkor prime lens stopped down to f/2.8. This is about three minutes of exposure using an APS-C camera, it's the belt of Orion (detail crop from an image that covered most of Orion).

Well, it obviously depends on the lens. I have a 50 mm f/1.8 Nikkor F-mount lens, the latest version, and you can barely see a hint of the spikes.


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#8 BQ Octantis

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Posted 14 July 2019 - 08:09 AM

Love it!



#9 Gipht

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Posted 14 July 2019 - 08:51 AM

Really enjoy this area of the night sky, and your picture kept me looking for several minutes.  Thanks for the excellent work!



#10 AstroBobo

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Posted 14 July 2019 - 10:41 AM

Thanks for the kind words! I see there+s not much info on the Nikon Z6 in astrophotography, I really hope this helps. It's a wonderful camera and the lens is much much sharper that the "old" F-mount.



#11 calypsob

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Posted 16 July 2019 - 08:21 AM

Hello all,

 

a few days ago I finally tested my Z6 with the Nikkor 50 mm S lens. Here's the image, 20x2 min exposures, ISO 800 and f/5.6. Images were converted to .tif with Nikon Capture NX-D, then stacked and processed in PixInsight. Absoluteny NO noise reduction, and the camera is not modded. Because of this, the red nebulae had more of a magenta tint, so I corrected it in PS to look more natural. Also, I reduced the star sizes with morphological transformation in PI. This is excellent performance for an unmodded camera. And the lens is super sharp even at f/4, but this was tracked on a Star Adventurer mount, so I opted to close down the lens.

 

Feel free to take a look at the larger resolution on Astrobin. The image was taken from the newly designated international dark sky park Petrova Gora, Croatia. I measured 21.52 with my SQM (non  L).

That is fantastic. It did a fine job of picking up Ha. I think those big pixels probably helped alot. Great work




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