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Wide angle astronomy
Jun 7, 2016 11:31:38 #
I got a chance to head out to darker skies Saturday, not dark ind you, just darker 
I wanted to head out to catch a glimpse of a bright Iridium flare, and while I was out I figured I might as well get some photos too.
I left one camera running by itself after the first few photos, grabbed 305 30 sec exposures
For a total exposure of 2:30:30.
With an elapsed time of 3:09:50.
I expected a difference to allow for the time between shots, but even counting that, I see a difference of 12:12.
I don't see a gap in the trails that would explain it.
My guess is that every so often the time between would stretch out a couple/few seconds. Without looking at the EXIF data for EVERY one, I can't think of a way to find out.
GT
I wanted to head out to catch a glimpse of a bright Iridium flare, and while I was out I figured I might as well get some photos too.
I left one camera running by itself after the first few photos, grabbed 305 30 sec exposures
For a total exposure of 2:30:30.
With an elapsed time of 3:09:50.
I expected a difference to allow for the time between shots, but even counting that, I see a difference of 12:12.
I don't see a gap in the trails that would explain it.
My guess is that every so often the time between would stretch out a couple/few seconds. Without looking at the EXIF data for EVERY one, I can't think of a way to find out.
GT
Jun 7, 2016 11:52:23 #
GTinSoCal wrote:
I got a chance to head out to darker skies Saturda... (show quote)
Very nice work Gordon. Did you go all the way out to Joshua Tree???
Craig
Jun 7, 2016 12:22:19 #
CraigFair wrote:
Very nice work Gordon. Did you go all the way out to Joshua Tree???
Craig
Craig
Thank you!
OH GEEZ!
NO!
I just went out to Saddleback Butte about 20 miles east of home
GT
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Jun 7, 2016 14:10:46 #
I really like 2 and 5.
Great shots.
You need to quit leaning on you truck so heavy. It's out of alignment now. ;o).
Great shots.
You need to quit leaning on you truck so heavy. It's out of alignment now. ;o).
Jun 7, 2016 14:54:38 #
Albuqshutterbug wrote:
I really like 2 and 5.
Great shots.
You need to quit leaning on you truck so heavy. It's out of alignment now. ;o).
Great shots.
You need to quit leaning on you truck so heavy. It's out of alignment now. ;o).
Thank you!
GT
Jun 7, 2016 20:48:11 #
Like them all, what camera were you using and what was your settings for the Milky Way and the star trails?
Jun 7, 2016 23:07:17 #
Europa wrote:
Like them all, what camera were you using and what was your settings for the Milky Way and the star trails?
Thank you,
I used Canon 50d for the star trails and 5d MkII for the Milky Way photos.
Star Trails: ISO 3200, 8mm, f3.5, 30 sec, 305 exposures
Milky Way: ISO 6400, 14mm, f2.8, 30 sec
First Iridium flare: 50d, ISO 640, 8mm, f3.5, 30 sec 1 exposure
Second Iridium flare: 5d MkII, ISO 6400, 14mm, f2.8, 20 sec 6 exposures
I added some extra light on some of the images, with a flashlight or strobe.
GT
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Jun 7, 2016 23:27:56 #
Jun 8, 2016 06:54:48 #
Jun 8, 2016 08:41:44 #
collhart wrote:
What would happen if you reduced the ISO and extended the exposure time.
I've done that too, but, I prefer the 30 max to keep things simple. A standard wired release will work then
Even though there is some movement of the stars, I don't find it objectionable. Much more time and the would really start to streak.
Up to around 3 minutes the II does a great job, but that is with help from Adobe
GT
Jun 8, 2016 08:54:42 #
dlmorris
Loc: Loma Linda, Ca
Really nice set! I especially like the last one, with the log seemingly with it's fingers together, and pointing to the sky! Very nice.
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Jun 8, 2016 08:57:06 #
dlmorris wrote:
Really nice set! I especially like the last one, with the log seemingly with it's fingers together, and pointing to the sky! Very nice.
Thank you!
I'm really glad I ran across that dead Joshua!
GT
Jun 12, 2016 03:01:27 #
Beautiful Gordon!
Sounds like you might have bumped into something I did. I offer the following for your consideration...
When using my intervalometer, I set for a 25 second exposure, then give a 5 second lapse to make sure the shot is saved and the camera has reset.
When I push it, sometimes a shorter storage time causes the rig to delay.
Hence (also) why I use the biggest, baddest, fastest SD card recommended for my meager DSLR. I couldn't do much for the cameras lack of huevos, but I could gulp and buy a fast and huge (64gig-95/90ms) SD card. Been really happy with it.
Generally stores in <1 second. But running 25/5 for a total 30, or 2 winks a minute, I can estimate my count better.
Last time I did a night run I amassed over 3000 shutter counts (1 night). I can see wearing out my camera pretty quickly, and have in excess of 50,000 counts in less than 2 years.
But it is a great way to catch what my eye misses.
And I'm lazy, set it and forget it. Sleep while it works the night shift.
Sounds like you might have bumped into something I did. I offer the following for your consideration...
When using my intervalometer, I set for a 25 second exposure, then give a 5 second lapse to make sure the shot is saved and the camera has reset.
When I push it, sometimes a shorter storage time causes the rig to delay.
Hence (also) why I use the biggest, baddest, fastest SD card recommended for my meager DSLR. I couldn't do much for the cameras lack of huevos, but I could gulp and buy a fast and huge (64gig-95/90ms) SD card. Been really happy with it.
Generally stores in <1 second. But running 25/5 for a total 30, or 2 winks a minute, I can estimate my count better.
Last time I did a night run I amassed over 3000 shutter counts (1 night). I can see wearing out my camera pretty quickly, and have in excess of 50,000 counts in less than 2 years.
But it is a great way to catch what my eye misses.
And I'm lazy, set it and forget it. Sleep while it works the night shift.
Jun 12, 2016 12:14:48 #
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