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The CCD camera
I have used successively several SBIG CCD cameras:
ST2000 XM, ST2000 XCM, ST8 XME and STL11000 XM
My current choice:
SBIG ST10XME camera.
The camera is equiped with the SBIG CFW9 filter wheel (CFW10 on this picture), it contains the Baader L, Ha 7nm, SII 8nm, OIII 8,5nm filters and a Custom Scientific Ha 10nm filter.
In the picture above, the refractor is used at f 7.3 with the 2.7" field flattener. A specific spacer (marked with white pen on the picture) is used to obtain the correct distance to the CCD chip, providing a 65mm fully illuminated flat field circle. I still have plenty of tolerance to increase my chip size...
Two different telecompressors are also used, depending on the compression factor needed and the size of the chip.
Have a look at my Astro-Physics 155 f7 StarFire EDF refractor dedicated webpage for further informations.
I really enjoy the Baader filters. I decided to go for them in 2007, after having done successfull tests. I had been previously so disappointed with other competitive brands... They are thin, lightweight, and have excellent optical and transmission properties.
They have a very thin barrel (so less mechanical vignetting), and above all, they are free of reflections !!!
They perfectly match the high sensitivity of the SBIG ST10 XME camera.
Quantum efficiency of the KAF3200 ME chip pasted on the Baader Narrowband filters transmission curves.
Here is the first light of the Baader Ha 7nm filter: note the level of rich details, the smoothness of the image in spite of the urban location, the absence of reflections, and the sharpness of the stars.
It is a simple crop of the original FITS image, unprocessed.