I know this has been posted numerous times, but I couldn't resist trying out a full moon shot with the 7D and KM 75-300mm (D).
Taken at 1/30s at f14, ISO 100, slight sharpening in PS, cropped at 100%
Tried using 2x tele-convertor with the lens but either 2s timer or 10s timer doesn't help. Output slightly blurred. A 2s timer with remote cable may help but I do not have it.
Adams

Taken at 1/30s at f14, ISO 100, slight sharpening in PS, cropped at 100%
Tried using 2x tele-convertor with the lens but either 2s timer or 10s timer doesn't help. Output slightly blurred. A 2s timer with remote cable may help but I do not have it.
Adams