Tried imaging Jupiter with a
double Barlow arrangement - DSLR with T-adaptor x2 Barlow tube inserted into another
x2 Barlow tube and then into diagonal (no focal reducer). Camera was set to
video at 25 FPS and 640 x 480px. I noted that the image of Jupiter on the live
screen of the camera was noticeably dimmer with the 2 Barlow x4 arrangement than
with just a single Barlow, so set shutter speed to 1/30 second and video FPS at
25 (have to turn manual video settings ON Nikon D3200 menu options).
Results were reasonably
successful once 3-minute video was stacked in Registax:
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