Reports

Post details: Another untracked astrophoto

2008-09-21

08:01:25 am, by Tim Harpur

, 135 words, 289 views

Categories: Reports

Another untracked astrophoto

Here's a shot of the Milkyway I took three nights ago just before the bright moon rose. It is a single 1 minute exposure at ISO 1600 - standard camera tripod - no tracking - using a 4.5mm fisheye lens.

And another image taken the next day - processed slightly differently (this was from 9 - 30 seconnd exposures).

I lucked out with these shots - no visible objects tracking through. However, on another series of 30 second exposures I had what would initially appear to be a meteor - except from the length of the 3 exposures it was caught on - it looks to have lasted around 1 minute. So I am guessing it may have been a satellite that rotated to suddenly become bright. Notice the "curved path" caused by the edge of the fisheye. I don't know - if anyone has a better theory let me know.

Permalink 4 comments

Comments:

Comment from: steveg [Member]

Hi Tim

Nice shot. It's amazing what a short lens can do.
Do you see any satellite tracks in it?

Permalink 2008-09-21 @ 11:50

Comment from: Mike Spicer [Member]

Excellent image, Tim. I hope you submit the original 3500 x 2400 image to Bob Christmas for the Calendar Contest (it's a contest, right?)

Permalink 2008-09-21 @ 23:36

Comment from: kerry [Member]

Hey Tim that's a really cool image! Not only is this lens great for these Milky Way shots, but it's perfect for meteor showers as well.

Permalink 2008-09-23 @ 20:11

Comment from: steveg [Member]

So since the pixels are about a 15th of a degree, you have about that much time before smearing would be notable.
4 minutes per degree at the equator, so a 2 minute exposure should show minimal effect of the earths rotation.
I like this lens, and the concept. I am going to get one too.

Permalink 2008-09-24 @ 12:30

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