This page is for my own use - to compare and assess when I should use the doubler. It is not a review.
The field of view and a summary of fully automatic camera choices within the same central sample point looks like:
|150mm, ISO 125, 1/250 sec, f/5.0|
|Doubler 300mm, ISO 1600, 1/400 sec, f/13|
|500mm, ISO 3200, 1/400 sec. f/8.0|
|Doubler 1000mm, ISO 3200, 1/640, f/18|