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2x converters


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3 replies to this topic

#1
lincsbirder2019

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Hi. i have a D3200 with a 150mm-600mm Sigma lens. Can anyone give me some info into the use of a 2x converter for this lens, good and bad please. Thanks



#2
Merco_61

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If I remember correctly, the D3200 needs an f/5.6 or faster lens to autofocus reliably.

The Sigma c is f/6.3 at the long end already without the TC. If you add a 2X, you end up with f/13 wide open and the AF will be slow and unreliable if it works at all. Besides that, this class of lenses don't handle converters that well as they are on the soft side already.



#3
Nikon Shooter

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These are VERY PERSONAL considerations.

I don't use any TC. It costs too much light — and that can make
focusing difficult (read impossible in some conditions).

They are active optically and, adding many air to glass surfaces,
will impair critical sharpness.

These points apply to my work and to the gear I use. YMMV!



#4
mikew

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With a Sigma 150-600 a 2x is not a good idea, even if the camera would focus (which i doubt) you would be raising the iso too much to keep the shutter speed up, the advice which none of us like is to get closer to the subject, try shooting that lens wide open which may let you lower the iso so allow for a bit more cropping.