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Extra details
Bratislav,
Thanks for your reply.
Manufacturer states F/6. Also states focal length of 900 mm and clear aperture of 152 mm which makes about F/5.92?
Initially I will be using a DSI Pro II monochrome which has a Sony ICX429ALL (Interline) Image Sensor. Sony data sheet shows:
Chip Size: 7.40 mm (H) x 5.95 mm (V)
Number of pixels: 795 (H) x 596 (V) approx. 470K pixels
Number of effective pixels: 752 (H) 582 (V) approx. 440K pixels
By definition, I believe that being interline, each second column is light shielded and inactive reducing the overall extrinsic QE by a factor of two (Howell, S. 2006. Handbook of CCD Astronomy 2nd ed.)
(The LHIRES III spectrograph is optimised for an F/10 (F/8 - F/12) scope so I will probably need to add in a [short] Barlow. Hence the need to have an understanding of how much travel is available / needed).
Regards,
Patrick.
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