Tracking With 400mm Camera lens?

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hatflyer avatar
I have the Sky Watcher AZ-GTi mount in EQ mode. Can it track with a 400mm lens on a crop sensor without auto-guiding?  I've had success at 300mm.

Thanks.
Well Written
Ed Dixon avatar
I have a full frame 400mm and a Sky Guider Pro and it does 2-3 min subs without many issues.