Recent pics

  • #1
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,591
2,240
Back up and running; got these last weekend.

Composite_s_zpslw1d8b7a.jpg


400/2.8, 50 minutes total integration time, 10s ISO 2000 individual frames.

orion_14m_2s_zpspqfr5uzx.jpg


800/5.6, 14 minutes total, 6s ISO 2000 individual frames.

It's been an adjustment to the new sensor, my alignment technique had to improve by about 2x to eliminate residual drift; also the sony had in-camera stabilization which gave me another stop's worth of shutter time.
 
  • Like
Likes DennisN, aamirza, fresh_42 and 1 other person

Answers and Replies

  • #2
3,379
944
Nice stuff.
Is the top one Ursa Major?
The second one is what?
 
  • #3
davenn
Science Advisor
Gold Member
9,506
8,522
Is the top one Ursa Major?

no, that's M45, The Pleiades star cluster

The second one is what?

That's M42, the Orion Nebula ... it shouldn't really be that blue, that nebula has lots of red in it

Maybe Andy can let us know how he was doing the processing ?


Dave
 
  • #4
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,591
2,240
I struggle with colorimetrics- the sky is tinted red from light pollution, so I try and fix it by post-processing and normalizing the colors such that the sky is a neutral dark grey and bright stars are white, then bumping up the color saturation. I never get the same colors twice.... those images do look 'bluer' than I recall setting them, tho.
 
  • #5
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,591
2,240
See, it's pretty easy to alter the colors:

orion_14m_2.tif%20RGB_zps6hcuglwx.jpg


orion_14m_2.tif%20RGB-1_zpsfqvkiy4y.jpg


To be fair, I've been staying up late for the stars and getting up early for the moon:

DSC_2041s_zpsqnt3wdve.jpg


DSC_2042s_zpsmleigpcl.jpg
 
  • Like
Likes davenn and fresh_42
  • #6
davenn
Science Advisor
Gold Member
9,506
8,522
See, it's pretty easy to alter the colors:

orion_14m_2.tif%20RGB_zps6hcuglwx.jpg


orion_14m_2.tif%20RGB-1_zpsfqvkiy4y.jpg


much more realistic and lots more detail :smile:


Dave
 
  • #7
309
4
...
400/2.8, 50 minutes total integration time, 10s ISO 2000 individual frames. ...

800/5.6, 14 minutes total, 6s ISO 2000 individual frames. ...

Andy, Nice photos, well done.
I'm quite new to this type of imaging, so wondering if you could elaborate on the meaning of these numbers / settings?

Is it: number of shots / f-stop / total time / shutter speed / ISO?

Regards,

Noel.
 
  • #8
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,591
2,240
Andy, Nice photos, well done.
I'm quite new to this type of imaging, so wondering if you could elaborate on the meaning of these numbers / settings?

Is it: number of shots / f-stop / total time / shutter speed / ISO?

Sure- sorry for any confusion.

when I write, for example, '800/5.6', that means I used an 800mm focal length lens at an f/# of 5.6. Similarly. '10s ISO 2000' means each exposure lasted 10 seconds and the camera ISO was set to 2000, and I stacked individual frames to give a total exposure time of 50 minutes, or 14 minutes, or whatever.

How has your astrophotography experience been so far? There's a fair number of experts here who have helped me get better.
 
  • Like
Likes davenn
  • #9
309
4
Thanks Andy. I forgot about the focal length. That makes perfect sense.

My experience so far is ... limited. I spend an amount of time in a Dark Sky Reserve in the south west of Ireland (Kerry), which is fantastic. When the skies are clear, it is amazing, but given that it is the south west of Ireland, there aren't many good viewing night :). So great views, but lots of cloudy nights.

Regards,

Noel.
 
  • Like
Likes davenn
  • #10
davenn
Science Advisor
Gold Member
9,506
8,522
Thanks Andy. I forgot about the focal length. That makes perfect sense.

My experience so far is ... limited. I spend an amount of time in a Dark Sky Reserve in the south west of Ireland (Kerry), which is fantastic. When the skies are clear, it is amazing, but given that it is the south west of Ireland, there aren't many good viewing night :). So great views, but lots of cloudy nights.

Regards,

Noel.

start off with some Milky Way pics ... camera, tripod and a wider angle lens, say 50mm or less, preferably down around 20mm give or take a bit
depending on your camera make and model, hopefully it can do long exposures up to 30 sec and are able to swap lenses (dSLR)

One great lens is the Samyang 14mm f2.8, produces really nice wide angle images
here's an example from a thread I started several months ago ...
https://www.physicsforums.com/threads/milky-way-pic-with-new-lens.832236/

get out there and start imaging and show us your results :)
post the camera settings used ... focal length, f-stop, ISO, shutter speed
resize images to around 1000 pixels on the long side and compress to around 80 - 85%
to limit their physical kb size

cheers
Dave
 
  • #11
309
4
start off with some Milky Way pics ... camera, tripod and a wider angle lens, say 50mm or less, preferably down around 20mm give or take a bit
depending on your camera make and model, hopefully it can do long exposures up to 30 sec and are able to swap lenses (dSLR)

One great lens is the Samyang 14mm f2.8, produces really nice wide angle images
here's an example from a thread I started several months ago ...
https://www.physicsforums.com/threads/milky-way-pic-with-new-lens.832236/

get out there and start imaging and show us your results :)
post the camera settings used ... focal length, f-stop, ISO, shutter speed
resize images to around 1000 pixels on the long side and compress to around 80 - 85%
to limit their physical kb size

cheers
Dave
Thanks Dave and excellent photo on the other thread. I'm super impressed that you can get that type of result from a single image. I'll count that as a target to aim for :)

Regards,

Noel.
 
  • Like
Likes davenn

Related Threads on Recent pics

  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
12
Views
1K
  • Last Post
Replies
10
Views
2K
  • Last Post
Replies
6
Views
883
Replies
6
Views
3K
Replies
13
Views
5K
Replies
1
Views
2K
Replies
4
Views
698
Replies
1
Views
3K
Replies
10
Views
3K
Top