My first deep sky image for months!
The Trifid, Lagoon and other friends from Saturday night. H-alpha modified Sony A7S on Tak Epsilon 180ED. 50min total exposure time as 100x 30sec subs at ISO 2000.
(http://www.markshelley.co.uk/Astronomy/2016/lagoon_trifid_06082016_small.jpg)
Stars are a bit squiffy at the top right so something obviously needs fixing :(
Larger version here:
http://www.markshelley.co.uk/Astronomy/2016/lagoon_trifid_06082016.jpg
Enjoy!
Mark
Wow, that's an even bigger FOV than I got down at Ollys with his Atik1100 & Takahashi FSQ106N - and yours shows more detail. Mine were 600sec subs and yours are only 30sec subs.
That's one amazing camera the Sony A7S, and I see Peter Shah is starting to use this camera too.
Carole
Quote from: Carole
Wow, that's an even bigger FOV than I got down at Ollys with his Atik1100 & Takahashi FSQ106N - and yours shows more detail. Mine were 600sec subs and yours are only 30sec subs.
That's one amazing camera the Sony A7S, and I see Peter Shah is starting to use this camera too.
Carole
Yes, it's a very interesting comparison with yours: http://forum.orpington-astronomy.org.uk/index.php?topic=9223
I've got a slightly larger field of view. My total integration time is 50min whilst yours is 270min. I don't need long subs because the sensor read noise is so low. However the wider aperture (180mm vs 106mm) of the Tak Epsilon means I am collecting 2.6x as much light (once my central obstruction is taken into account).
The QE (quantum efficiency) of the A7S is estimated as 65% whereas the KAF-11000 is 50%. The Sony certainly seems to be giving cooled mono CCD a run for its money! I always thought it would.
I'm sure Olly's sky is much darker - mine was giving an SQM reading of 20.8-20.9 that night.
Mark
That's pretty darn impressive Mark for such short acquisition. Out of interest do you know what causes the brightness down LHS - I presume another astronomical object near by - also evident in Carole's image.
Top marks though - John
Great picture Mark, such an interesting area
Fay