2 bad lens from B&H, what is the odd

Started Apr 21, 2011 | Discussions thread
Petri_H Junior Member • Posts: 47
Re: 2 bad lens from B&H, what is the odd

No. it is not just a Tokina thing:

Photozone.de on Micro Nikkor AF-S DX 85mm f/3.5:

"Typical for most macro lenses, the effective aperture decreases towards the minimum focus distance. The lens reports this corrected value to the camera."

Actually your Sigma might be the "defective" one, again Photozone.de on Sigma AF 150mm f/2.8 APO EX HSM macro:

"Regarding its IF (internal focusing) design the Sigma should loose about 1.5 f-stops at its most extreme macro setting but unlike the Micro-Nikkors the effective max. aperture is not adjusted (update: the latest generation does). "

viclauyyc wrote:

Yes, the aperture do change when I change the focus. But the max. aperture never get bigger than 3.2. And the lens should be a 2.8 lens.

Also, I test my Sigma 150/2.8 micro. The max aperture do not change. So i guess it is either a Tokina thing or it is just a bad copy.

I will call tokina see what they say tomorrow

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Vic Lau at Calgary

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