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A good quality 2x teleconverter will make your sensor the equivalent of 80mp in this context. Ie with the same lens, a 20mp camera with 2x teleconverter will r
by qume 9y ago
A good quality 2x teleconverter will make your sensor the equivalent of 80mp in this context.
Ie with the same lens, a 20mp camera with 2x teleconverter will resolve more detail than a 50mp sensor.
- dingaling 9y agoBut 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.
- vardump 9y agoYeah. Teleconverters are true lens "stress" testers.
- qume 9y agoPeople often forget that 2x increase in one dimension equates to a 4x increase in area and number of pixels. I didn't expect that of this community though, which is how I'm interpreting the down voting here. This is my profession so if the down voters know something I don't I'm very interested to hear where I've gone wrong.