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Marc Delcroix
member
Reged: 08/26/07
Posts: 64
Loc: France
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Re: Firewire DFK 21AF04.AS vs. Lumenera Skynex 2-0
09/10/07 05:33 AM
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Hi Joël,
I bought a monochrome SKYnyx 2-0 6 months ago, the reasons for my choice (instead of a DMK) where the following:
- 12 bits resolutions instead of 8bits. Experts say this really help in planetary imaging only when you have excellent seeing/conditions. But it really helps if you plan to do deepsky imaging (max exposure time is 3minutes)
- it is said by some to have a higher s/n ratio (but i've never seen a technical comparison)
- you can use a ROI (region of interest) to shorten the size of the capture, which helps the PC to keep up to a high frame rate and use 12 bits. But my opinion is that it helps only for Jupiter, to be able to acquire the maximum number of frames through the 3 color filters while keeping a total acquisition time short enough to avoid a blur due to the fast rotation of the planet. For the other planets, Saturn is not bright enough anyway (so i do LRGB with it, main thing beeing to limit only the acquisition in L), and Mars the rotation effect of Mars is smaller (disk smaller, rotation longer)
But to use the higher frame rate possible (60fps), you need a hard drive fast enough ...
Hope that helps
--------------------
Tournefeuille, France
personal web site
Member & webmaster of the
French Astronomical Society (SAF), planetary observations commission
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