3 ms·
But it's a losing race; adding a 2x teleconvertor halves the amount of light received, so I have to drop my shutter speed and / or raise the ISO to compensate.
by dingaling 9y ago
But it's a losing race; adding a 2x teleconvertor halves the amount of light received, so I have to drop my shutter speed and / or raise the ISO to compensate. Both of which are disruptive to image detail.
Plus the distorting effect of the extra glass in the lightpath.
- deleted 9y ago[deleted]
- 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.