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1.7x teleconverter issue (1 Viewer)

gandytron

gandytron

Well-known member
Dear All

I have both 1.4x II TC and a 1.7x II TC (Nikon brand)

The 1.4x works perfectly well with both my D7100 and my V1 on my 300mm f4 VR. However when I put the 1.7x on my D7100 the focus is much less reliable (but I have no problem with the V1).

Is this a case of needing to do some microadjustment/calibrating in the D7100 body?

Thanks in advance

Dave
 
gandytron said:
Dear All

I have both 1.4x II TC and a 1.7x II TC (Nikon brand)

The 1.4x works perfectly well with both my D7100 and my V1 on my 300mm f4 VR. However when I put the 1.7x on my D7100 the focus is much less reliable (but I have no problem with the V1).

Is this a case of needing to do some microadjustment/calibrating in the D7100 body?

Thanks in advance

Dave
Click to expand...

Micro adjustment is definitely a good idea.
With a TC mounted any back/front focus issue can be more apparent,
since DOF will decrease.

Generally AF-performance/speed will decrease with any TC mounted since less light will
hit the AF-module.

On your D7100, only the center focus point supports AF at f-stops slower than f/5.6 and with the 1.7x TC you only get f6.3.

http://imaging.nikon.com/lineup/dslr/d7100/features01.htm
 
Last edited:
Hermann said:
Still, it's amazing AF works with the 1.7 converter on the V1 and not the D7100.

Hermann
Click to expand...

"That is why Nikon 1 is equipped with both a "focal plane phase-detection AF" superb for shooting fast action and a "contrast-detect AF" excellent for capturing subtle details in poorly lit areas."

http://imaging.nikon.com/lineup/acil/bodies/v1/features02.htm

AF is very good on Nikon 1, but the cameras and lenses are not cheap either.
D7100 don't have the contrast detect AF.
 
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