It is currently Sun Jan 21, 2018 10:37 pm




Post new topic Reply to topic  [ 6 posts ] 
 Strange static objects in star timelapse - what is it? 
Author Message

Joined: Mon Mar 07, 2016 1:28 am
Posts: 2
Post Strange static objects in star timelapse - what is it?
Hi there, Im new to timelapse and star photography. I shot a sequence this weekend and noticed several of the 'stars' appear static and then fade away. I have no idea what this could be and figure maybe someone on this forum can clarify whats going on?

https://youtu.be/HIHwv22XMns

The sequence is shot in Norway with a Pentax K-3, about 2 hours after sunset.


Mon Mar 07, 2016 1:49 am
Profile
User avatar

Joined: Tue Apr 29, 2008 2:48 pm
Posts: 1144
Post Re: Strange static objects in star timelapse - what is it?
Geosynchronous Satellites? a refection in a filter in front of the lenses?

_________________
Please check out how to embed a Vimeo link.
Tim T


Tue Mar 08, 2016 9:40 am
Profile
User avatar

Joined: Wed Nov 25, 2009 1:17 am
Posts: 328
Location: Hindmarsh Valley, South Australia
Post Re: Strange static objects in star timelapse - what is it?
weird ? check the original frames because it sort of looks like the mp4 encoding that's caused it.

steve.

_________________
Amongst Myselves - ambient, landscape and space music
Canon 5Dm2,450D, 17-40mm EF f4, 55-250mm EF-S, 50mm f1.8 EF, Custom Intervalometer (UM9 and UM12) and MOCON, Meade LXD75 SN10


Tue Mar 08, 2016 6:53 pm
Profile

Joined: Mon Mar 07, 2016 1:28 am
Posts: 2
Post Re: Strange static objects in star timelapse - what is it?
Thanks for your replies! :)
@pixelbot: No filters used. I did some research about the geosync. satelites, and yes that could be it, but to me it still seems strange since there are so many. The videos I have seen there are one to maybe a few.

@amonstmyselves: I checked the frames, the static dots are still there in my RAW files, so that rules out video encoding as the cause.

Any other ideas?


Tue Mar 08, 2016 11:54 pm
Profile
User avatar

Joined: Wed Nov 25, 2009 1:17 am
Posts: 328
Location: Hindmarsh Valley, South Australia
Post Re: Strange static objects in star timelapse - what is it?
When doing long exposure you get hot pixels but they are usually there all the time and don't move ? It certainly something to do with the camera's sensor. Hmm ?

One thing to check is that that are only one pixel in size which will tell you if it's a electronic or software issue. If it is some sort of visual artifact it would spread over more than one pixel.

_________________
Amongst Myselves - ambient, landscape and space music
Canon 5Dm2,450D, 17-40mm EF f4, 55-250mm EF-S, 50mm f1.8 EF, Custom Intervalometer (UM9 and UM12) and MOCON, Meade LXD75 SN10


Wed Mar 09, 2016 10:23 pm
Profile
User avatar

Joined: Mon Jun 23, 2008 9:20 am
Posts: 207
Location: The Netherlands
Post Re: Strange static objects in star timelapse - what is it?
The movement in the video was done in post?
So the static objects are actually on fixed positions on the camera sensor?

_________________
- 153957 Photography -


Thu Mar 17, 2016 11:15 pm
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © phpBB Group.
Designed by Vjacheslav Trushkin for Free Forums/DivisionCore. pozycjonowanie