Jump to content

SkySurveyBanner.jpg.21855908fce40597655603b6c9af720d.jpg

A 3 Minute Full Frame Sub on an AstroTrac @ 500mm

StuartJPP

By StuartJPP
in Imaging - Discussion

Recommended Posts

StuartJPP

StuartJPP

Posted
Posted

Inspired by Mautice Toet (mftoet) recently posting his M45 image and including an individual sub showing the starting point I have decided to share one of mine.

I think my most recent imaging session produced my best collection of subs so far. The image shows the corners of an unprocessed full frame raw image captured on a Canon 5D Mark III coupled with the Canon 500mm f/4 L IS lens mounted on the AstroTrac using 3 minute subs (@ ISO 800). Naturally I would like to go deeper (don't we always?), and get more consistency but I think I have reached the limit of what I can achieve. In the top right-hand corner there is obvious elongation, I assume this is attributed more to the optics than the tracking though tracking is far from ideal.

The stars aren't perfectly round as frame to frame produces a consistent drift in the same direction as can be seen in the animation.

Well I hope this inspires others to occasionally include single subs to see what the base is for the images we finally post.

Corner crops (1:1 pixel scale).

gallery_27141_2403_1032709.png

 

 

 

 

 

 

Frame to frame drift with 10 second interval between frames (with a bit of thin cloud thrown in!).

gallery_27141_2403_27657.gif

 

 

 

 

The end result (with 22 of these frames stacked, the above one being the best of the lot).

15467562940_408529da41_b.jpg

M45 - Pleiades or "Seven Sisters" by StuartJPP, on Flickr

 

 

 

 

Thanks for looking...

Link to comment
Share on other sites
wxsatuser

wxsatuser

Posted
Posted

The corners are not to bad, better than my Borg 67 on a crop sensor although thats WIP.

The drift, would have expected some but again could be worse.

Overall I would be very happy with 500mm on an Astrotrac and produce a very nice image like that. :icon_salut:

Link to comment
Share on other sites
StuartJPP

StuartJPP

Posted
  • Author
Posted

Cheers everyone...hope to see some RAW single subs from people in future...

That lens looks to be a cracker,   beautiful image BTW.  How do you mount that lens on your astrotrac, must be quite a weight?

Mark

Mark, this is mounted on the AstroTrac Wedge and all balanced on the AstroTrac Head.

Link to comment
Share on other sites
  • 11 months later...
zeppo

zeppo

Posted
Posted

Zappo its not really good form to post images in other people's topics, best to open a thread for your own image buddy :)

You're right Martin! Maybe a moderator could move my posts into another topic?

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.