Teleconverter with AF-S 50mm 1.8G

RocketCowboy

Senior Member
Because on a full frame camera she would effectively have a 70mm f2.8 lens and on a APSC camera it would give her an effective 105mm f2.8 lens.

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hark

Administrator
Staff member
Super Mod
Contributor
Because on a full frame camera she would effectively have a 70mm f2.8 lens and on a APSC camera it would give her an effective 105mm f2.8 lens.

No, it won't. Depending upon which teleconverter is chosen, there will be 1-2 stops of light lost making the f/2.8 lenses at least an f/4 or f/5.6. In the case of the one mentioned, even if it would be compatible, it would be an f/4.
 

pforsell

Senior Member
No, it won't. Depending upon which teleconverter is chosen, there will be 1-2 stops of light lost making the f/2.8 lenses at least an f/4 or f/5.6. In the case of the one mentioned, even if it would be compatible, it would be an f/4.

OP asked about 50/1.8 and 1.4x teleconverter. If that was feasible and happened to work, the end result would be 70mm f/2.5, not f/4.
 

RocketCowboy

Senior Member
OP asked about 50/1.8 and 1.4x teleconverter. If that was feasible and happened to work, the end result would be 70mm f/2.5, not f/4.

Hark did clarify that it was making a 2.8 lens an f/4, but yes, a 1.8 would be a 2.5. Still, the Op asked over a year ago.


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pforsell

Senior Member
Hark did clarify that it was making a 2.8 lens an f/4, but yes, a 1.8 would be a 2.5. Still, the Op asked over a year ago.


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I think it was a bit more convoluted that that. SFC-Ren said TC would make a 50/1.8 into a 70/2.8 and Hark said that is wrong and, got to the f/4 figure. (Both figures wrong, of course. It would go from f/1.8 to f/2.5 and then f/3.5). But the OP's idea was not to add two teleconverters to 50/1.8.

Anyway, you're right the OP's question was posted a long ago. Sorry for posting, but I thought the thread was active because of half a dozen new posts.
 

SFC_Ren

New member
I was speaking only of the focal length in my reply and did incorrectly state the wrong maximum aperture. Yes, a 1.4x nikon converter will lose 1 stop of light effectively making a f/2.8 lens have a maximum aperture of f/4.0 it will still give her an effective focal length increase as I stated above. So you are half correct. Thanks for the correction.

No, it won't. Depending upon which teleconverter is chosen, there will be 1-2 stops of light lost making the f/2.8 lenses at least an f/4 or f/5.6. In the case of the one mentioned, even if it would be compatible, it would be an f/4.
 
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