3 ms·
-Unless I am much mistaken, a 2x teleconverter will cost you two stops - meaning 1/4 of the light. (I’ve mostly used a rangefinder in later years; they do not l
by lb1lf 9y ago
-Unless I am much mistaken, a 2x teleconverter will cost you two stops - meaning 1/4 of the light. (I’ve mostly used a rangefinder in later years; they do not lend themselves well to teleconverters. :-)
- qume 9y agoYou lose almost no light. You are changing the area of the sensor the part of the scene is spread over. Its a triviality as a result of us expressing the F number as the ratio of the focal length and the aperture size. The effective SNR of the sensor is increased due to more sensor being used for a given part of the scene, so the lower light level does not increase noise comparatively.