Thread: Taking Flats
View Single Post
Old 31-10-2010, 06:05 PM
Octane's Avatar
Octane (Humayun)
IIS Member #671

Octane is offline
Join Date: Dec 2005
Location: Canberra
Posts: 11,158
Because if the telescope is not at the same focus point as when you took your image, then, any aberrations such as dust bunnies, fibres on the optics, etc., will either be smaller than when you imaged, or larger.

You need to take flats at the same camera angle orientation and focus distance to ensure any anomalies are removed in calibration.

Reply With Quote