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Question regarding Zoom Rectangle & Planetary


timothyfarley
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Hello everyone!

I installed the 3.1 trial version recently to try out some lucky imaging with my Canon T2i/550d and 8" Skywatcher dobsonian telescope.

I gave Saturn a go last night for the first time to start learning the software. My question is this; from what I interpret from the manual, the zoom rectangle will determine where the 5x liveview zoom records? Are there any issues to consider if I keep repositioning the zoom rectangle and recording until it leaves the un-zoomed liveview completely? Or should I keep to 5x liveview at the centre of the camera sensor and keep repositioning my scope? My focal ratio is very fast so planets drift by the 5x view very quickly, which I understand and accept as a limitation of my scope...but if I could save time from manually tracking, that would be great!

Apologizes if this is more of an hardware question than software.

Much appreciated,

 

 

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You are correct about the behavior of the zoom rectangle. It should not matter whether you reposition the zoom rectangle or reposition the scope, as long as what you are imaging is in the 5X field.

You are incorrect about the fast focal ratio causing drift. Drift in declination is caused by polar misalignment. Drift in right ascension can be caused by an incorrect tracking rate. Actually a fast focal ratio would cause a lower magnification and a wider field of view which should appear to slow drift.

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In general, most Planetary Video Stackers will perform their own Centering as part of the Alignment/Stacking process. 

You will lose some chance at retaining the associated moons within the resulting image, but they are often too dim anyway.

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