ATIK 490 on Canon 300mm f/4 via Orion filter wheel
The 300mm Canon f/4 lens is fixed on the Orion filter wheel, housing Baader Ha,SII,OIII and IDAS LPS P2 filters.
ATIK 490 mono CCD
The ATIK 490 mono camera with the low noise Sony CCD sensor having over 9 millions sensitive 3,69mu pixels. -- http://www.sony.net/Products/SC-HP/cx_news/vol70/pdf/icx814alg_aqg.pdf
Canon 300mm lens
This lens is capable for astrophotography even at its fast f/4 f-stop.