This question comes up a lot in this forum, basically not all DSLRs have movie crop so an alternative is to find some software that will record the image on Liveview ie. what you have on the lcd of your camera when in shooting mode. That way, you can use the magnifyer function to enlarge the planet on the screen and the software will record the magnified view. You will need to connect the camera to a computer to achieve this and a program like Pipp to centre and convert the camera video format to AVI for stacking in Registax.
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