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Topic ClosedLunar and Astro Photography (7)

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Fred_S View Drop Down
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Direct Link To This Post Posted: 19 July 2020 at 09:52
Fully agree. I was only surprised that in Hans' set the comet seems the biggest in the 24mm shot.
 



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Fred_S View Drop Down
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Direct Link To This Post Posted: 19 July 2020 at 09:53
I like your stacked close up too Mikey200!
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Direct Link To This Post Posted: 19 July 2020 at 11:05
This was eight frames manually stacked in Photoshop (DeepSkyStacker didn't take to my source files)



230mm F7.1 10s ISO 1000 for each

I think my source photos are off focus - I was struggling with the Tamron lens in MF mode.

Mikey's 200mm photo gives me hope if we have a clear sky tonight! And I like Hans's landscapes with the comet; I'm guessing the windmill photo was cropped a little?
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Direct Link To This Post Posted: 19 July 2020 at 14:14
(updated to add stacked-frame version)
My humble attempt, from Cherry Springs State Park, International Dark Sky Site:

Comet NEOWISE C/2020 F3, evening of 15 July (single frame, slightly PP'd)



5 frames stacked



The comet was shot with my A900 and Tamron 70-200/2.8 at 200mm and f/2.8, 6s, no cropping, ISO 2500 (x5 for five frames). I did some portrait-orientation shots but the pan head on my tripod, in portrait orientation, is spectacularly unstable for long-exposure shots. The stacked-frames version turned out better than I hoped, but I lost some of the sunset color in the cloud.

It is out of focus (same issue Howard had, hard to find infinity focus in the dark). This trip to the dark sky site was actually more for observing than photographing, though if I'd thought of it, I could have been better prepared to do some photography.

And a bonus single-frame Milky Way shot with some processing & cropping.



The Milky Way shot was done with the A900 and Minolta 24/2.8, 13 seconds at f/2.8, ISO 2500, cropped to 16:9 to remove some badly distorted stars (coma).

Edited by alpha_in_exile - 20 July 2020 at 15:24
-- Matt
A900, Min 24/2.8, Min 50/1.4, Tam 90/2.8 Macro, Tam 70-200/2.8 | Nex5N & some MF lenses
my web gallery
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Direct Link To This Post Posted: 19 July 2020 at 22:28
Originally posted by mikey2000 mikey2000 wrote:

Just to add... Very good, Hans! It makes a big difference to have an interesting landscape
Thanks for the compliment!
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Direct Link To This Post Posted: 19 July 2020 at 22:30
Originally posted by alpha_in_exile alpha_in_exile wrote:

(updated to add stacked-frame version)
My humble attempt, from Cherry Springs State Park, International Dark Sky Site:

Comet NEOWISE C2020/F3, evening of 15 July (single frame, slightly PP'd)



The comet was shot with my A900 and Tamron 70-200/2.8 at 200mm and f/2.8, 6s, no cropping, ISO 2500 (x5 for five frames). I did some portrait-orientation shots but the pan head on my tripod, in portrait orientation, is spectacularly unstable for long-exposure shots. The stacked-frames version turned out better than I hoped, but I lost some of the sunset color in the cloud.

It is out of focus (same issue Howard had, hard to find infinity focus in the dark). This trip to the dark sky site was actually more for observing than photographing, though if I'd thought of it, I could have been better prepared to do some photography.

And a bonus single-frame Milky Way shot with some processing & cropping.

The Milky Way shot was done with the A900 and Minolta 24/2.8, 13 seconds at f/2.8, ISO 2500, cropped to 16:9 to remove some badly distorted stars (coma).
Great shots, like the milky way
Think Happy Thoughts, and You'll Fly (Peter Pan)
 



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Direct Link To This Post Posted: 20 July 2020 at 01:06
And another go tonight from the garden


Comet NEOWISE /4
A7 with Sigma 70mm F2.8 Macro Art | 15 frames | ISO 1600 / F2.8 / 2s
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Direct Link To This Post Posted: 20 July 2020 at 18:43
And this one, uncropped, with the FE 28mm F2


Comet NEOWISE /5

From 14 frames, stacked in DeepSkyStacker, each F2.8, ISO 800, 5s
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Direct Link To This Post Posted: 22 July 2020 at 17:18
Single frame captures of comet NEOWISE observed out of the kitchen window in the evening sky.



"Comet NEOWISE - 20 July 2020"

a7 + Minolta MD 250/5.6 RF Rokkor


"C/2020 F3 (NEOWISE) - 20 July 2020"

a7 + Minolta MD 200/2.8
/Michael

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Direct Link To This Post Posted: 22 July 2020 at 17:24
Wow, great catch Michael.
Respect. Observe. Capture. Enjoy.
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Direct Link To This Post Posted: 22 July 2020 at 17:30
Originally posted by Howard_S Howard_S wrote:

And I like Hans's landscapes with the comet; I'm guessing the windmill photo was cropped a little?
Thank you, not really cropped, but did loose a very little due to perspective correction
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Direct Link To This Post Posted: 22 July 2020 at 19:55
A few more from me, out of the dormer room this time, taken on 20 July with A99ii. All single shots at 10 sec.

Not sure about the stripe in #3. I had it in a number of consequetive 10 sec shots. I guess it's a contrail.

#1


24-70 @ 55mm

#2

24-70 @ 30mm

#3

Sony 50mm/14 @ f3.5

#4

70-400G @ 300mm

#5

70-400G @ 280mm



Edited by Fred_S - 22 July 2020 at 20:22
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Direct Link To This Post Posted: 22 July 2020 at 20:38
In the spirit of inquiry I tried it with my Minolta AF 500mm mirror reflex, fixed F8, each 15s and ISO 2000 on an A7; this is full frame after manually stacking five frames in Photoshop. (DeepSkyStacker refused.)


Comet NEOWISE /6

If I learnt one thing it was don't try long exposures with long lenses, unless you're after star trails, I guess.
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Direct Link To This Post Posted: 22 July 2020 at 20:48
Well Howard, there's rule of thumb: "the rule of 500"

Divide 500 by the FL of the Lens.
This gives the longest exposure (in sec) before star trails start to show.

500/24= 21 sec, so 15 sec should be okay.   
Hover it seems to depend on sensor size (using 600 or 400). Not sure what to use for what FL though.

The fixed FL of F8 isn't that helpful here, but a nice try though !
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