Site Sponsors
Results 1 to 13 of 13

Thread: A7RII 15-30s milky way exposures from Joshua Tree

  1. #1
    Member
    Join Date
    Aug 2015
    Posts
    44
    Post Thanks / Like

    A7RII 15-30s milky way exposures from Joshua Tree

    I've read quite a bit about how the A7RII shows thermal noise at longer exposure times. So, I headed to Joshua Tree with a couple of wide angle lenses for some milky way shots (my first ever.) Went fairly well. Below are some botched raws (badly framed, perhaps underexposed, etc.) that may nevertheless be useful for reviewing noise performance.

    FE 28mm at f2, 15 seconds, ISO 3200. Just the milky way:
    Same lens and settings, Milky Way plus some underexposed foreground:
    Rokinon 14mm at f2.8, 30 seconds, ISO 1600, Milky Way plus some underexposed foreground:

    No bulb, single shot mode, LENR was off, manual mode. No dark frame averaging (too lazy.) My overall impression, even on underexposed shots: better than I was expecting. I processed using C1, default sharpening and noise reduction settings. There were very few warm/hot pixels that I could see in the starfields, even when exposure was raised. In dark landscape areas, there were certainly some red/blue warm pixels when exposure was raised, but not a profusion of them. Quite fixable IMHO. The Rokinon was beautiful to use because of the hard stop infinity. I had more trouble focusing the FE 28mm f2.

    I understand that this addresses only a narrow subset of astrophotography--single 15-30 second exposures. I don't see myself getting into the heavy duty, super long equatorial mount exposures, or stacking 75 exposures over an hour or whatever. So for my purposes, quite acceptable performance, given my somewhat peripheral interest in this genre. If you do primarily astrophotography, it may not be the best choice based on what others have reported.

    Final product:
    Thanks 1 Member(s) thanked for this post
    Likes 22 Member(s) liked this post

  2. #2
    Senior Member MikeEvangelist's Avatar
    Join Date
    Jan 2013
    Location
    Minnesota, USA
    Posts
    933
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    Wonderful shot!
    Likes 1 Member(s) liked this post

  3. #3
    Senior Member
    Join Date
    May 2015
    Posts
    596
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    I think it would be even better if you could figure out an easy way to really get the foreground in silhouette.

  4. #4
    Senior Member
    Join Date
    Aug 2010
    Posts
    933
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    spence I really like that one..........
    Likes 1 Member(s) liked this post

  5. #5
    Sr. Administrator Jack's Avatar
    Join Date
    Oct 2007
    Location
    Los Altos, CA
    Posts
    10,486
    Post Thanks / Like
    Images
    1031

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    Wonderful shot indeed!

    FWIW: In C1 under the NR tool, there is an option for "Single Pixel." If you toggle that, it does an exceptional job of eliminating hot pixels -- and somehow it knows the difference between that and a star
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."
    Thanks 3 Member(s) thanked for this post
    Likes 2 Member(s) liked this post

  6. #6
    Super Duper
    Senior Member
    k-hawinkler's Avatar
    Join Date
    Dec 2009
    Location
    The "Land of Enchantment"
    Posts
    3,300
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    Quote Originally Posted by Jack View Post
    Wonderful shot indeed!

    FWIW: In C1 under the NR tool, there is an option for "Single Pixel." If you toggle that, it does an exceptional job of eliminating hot pixels -- and somehow it knows the difference between that and a star
    Thanks Jack for the reminder!
    With best regards, K-H.

  7. #7
    Member
    Join Date
    Aug 2015
    Posts
    44
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    Thanks all, you are too kind.

    And thank you for the tip Jack--the C1 single pixel removal feature works remarkably well!

  8. #8
    Senior Member ggibson's Avatar
    Join Date
    Oct 2009
    Location
    SF Bay Area
    Posts
    743
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    Great shot! I agree on the silhouette comment though, I think the red hue on the tree is distracting.

    How do you like the 28mm f2 for astro shots? I've been thinking of picking this lens up. How does it compare to the Rokinon 14mm for getting a good shot of the milky way that you can bring out in post?

  9. #9
    Senior Member
    Join Date
    Dec 2010
    Posts
    324
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    Lovely.

    I particularly like the red hue on the trees and foreground.

    Which lens did you use for the final shot?

    -Bill

  10. #10
    Senior Member pegelli's Avatar
    Join Date
    Dec 2010
    Location
    Belgium
    Posts
    2,119
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    Guy, Jack, just in case you're looking. I think this is a great shot to start your "Photo of the week" tradition.

    see here if you don't know what I am talking about
    My Pics
    Thanks 2 Member(s) thanked for this post

  11. #11
    Member
    Join Date
    Aug 2015
    Posts
    44
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    Graham: I think the colors and contrast from the 28mm f2 are excellent. Would be hard for me to say where it stands WRT the Rokinon 14mm without more outings, but both seem nice enough. Infinity focus is a little easier with the Rokinon's hard infinity stop. There's a good review of the 28mm with an astrophotography focus here, which includes some comparisons to the Rokinon.

    Bill: that final shot was the Rokinon 14mm. Pretty terrific lens for $299.
    Thanks 1 Member(s) thanked for this post

  12. #12
    Sr. Administrator Jack's Avatar
    Join Date
    Oct 2007
    Location
    Los Altos, CA
    Posts
    10,486
    Post Thanks / Like
    Images
    1031

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    I think the Picture A Week thread is a great idea, so I've initiated a place to start it here: http://www.getdpi.com/forum/artful-i...-have-fun.html

    And I agree that this image is a stellar (ha!) image to start it with!

    PS: re the glow on the tree, I like it as it seems natural for the late Sunset afterglow light. I am slightly bothered by the "white" light on the tree top, but do not find it offensive, rather respect it as an artistic choice -- me, I'd tone it down a stop or so, or yellow it up a bit, or both
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."
    Thanks 1 Member(s) thanked for this post
    Likes 1 Member(s) liked this post

  13. #13
    Senior Member
    Join Date
    Dec 2010
    Posts
    324
    Post Thanks / Like

    Re: A7RII 15-30s milky way exposures from Joshua Tree

    I agree the Rokinon looks mighty fine and the price is low enough to consider giving it a go.

    Problem is, I have the 16-35. But it is only f/4.

    But I have the A7S2 on preorder.

    And I will likely never see a sky like that.

    Anyway, a truely well crafted image. And though I do really like the red on the tree I agree that the 'white' light at the top may be bit distracting.

    -Bill

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •