The orbit of Syrius A and B in 2014-2015 is about 10 arcsec of separation.
My 305 mm with focal length of 1700 mm and Canon 1100D has about 0,7 arcsec/px. With some refraction we can think in 1,arcsec/px.
Therefore it needs at least 10 pixels of separation between Sirius A and B. Very difficult to me capture those stars with good visibility each one.
What was your resolution in arcsec/px ?
Reflector 114, focal length 900 mm and Canon ... If it is Canon 1100D, 1.20 arcsec/px, therefore with perfect seeing 8 pixels for 10 arcsec ... I don't believe you can resolve that binary system. Your set of equipment, with a normal refraction should have resolution of 2 arcsec/px, so 5 pixels for 10 arcsec. This, 5 pixels, should be almost the diameter of Syrius A.
I am not talking about brightness or magnitude. I am talking about resolution in arcsec/px.
See, a similar separation. I got with very good seeing. I read that you used barlow 2x, so with it ... maybe ... your resolution would be 0,60 arcsec/px theoretical... I prefer think about 1 arcsec/px with normal refraction.
You can measure your actual resolution with Photoshop. Use a well known distance between two stars, find your real arcsec/px and see if it is compatible with the Syrius image.
Some other examples you can see here: http://jsmastronomy....System-f50.html
Edited by jsmoraes, 31 December 2014 - 02:57 PM.