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For more information, please visit www. Sign in Register. Zoom the image with the mouse. Sigma 1. Sigma Sigma 1. Rating Required Select Rating 1 star worst 2 stars 3 stars average 4 stars 5 stars best. Thank you for being willing to try it out for me.
Apr 06, as a reply to Inspeqtor's post 7. Tanglefoot47 Tanglefoot47 Goldmember. Apr 07, 8. Inspeqtor wrote in post Another question Apr 07, 9. Apr 07, I have the older Kenko 1. Apr 07, as a reply to Inspeqtor's post Jump to forum Not a member yet?
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Apr 03, 2 Another question Bay Area More info. Apr 03, 3 my kenko 1. Apr 03, as a reply to DreDaze's post 4 Thank you. Apr 03, 5 Inspeqtor wrote in post Thank you. Apr 03, as a reply to DreDaze's post 6 That would be great! I just purchased on e-bay the above TC with the expectation of using it with my variable aperture zoom lens. I mounted it on a d with the above lens. And then I found out auto focus was hit and miss! For whatever reason I was not expecting this. It works very well with my f4 of course but I was expecting the option to use it with a zoom - with AF.
MF is of course a workable option but less convenient. Was I wrong in my original assumption? Should I be happy with the MF on a zoom? Your expectation disregards the physics. The PD AF sensor needs at least an f-value of 5. The 1. That is why you get such hit and miss results. Alternatively, use live view with contrast AF focussing. It works fine with the mm f4, because the TC turns the combination in f5.
The PD AF sensor can still see fine. Thanx for the response - However the center AF point works at f8 and is the point I use and therefore ok with the 5.
The max aperure with a t. It works, but not well enough. I'd rather crop than use that combo. I've used this combination well, a Tamron , not Nikon, but close enough on a D! It won't work well in dim conditions with a D; can't speak to a D at all. I was under the impression that just about all the never Nikon bodies had usable AF center focus points at F8.
I have had, or have, all of those cameras and the usability at F8 were selling points for me. That doesn't mean that I tried it on all those cameras, but that was part of the marketing that made my decision to buy them.
Almost assuredly the D4 has this capability as well. It would be a scandal if it didn't. Did you choose single AF mode explicitly? On page , The U. The camera is set on single AF point Of course I can't tell for sure but try cropping to see which look better.
The exposure is very different to draw any conclusion. The first picture has much more contrast than the 2nd photo. Nikon is very clear that this lens will not AF with a tele-extender. In fact, you cannot even mount it on the one Nikon makes. I have known people who do use a Kenko with it, but except in very good light with high contrast subjects, they all resort to MF.
Every nikon AF point on every body can AF down to f8. The downside is the AF performance can be very "miss" in low contrast light, low light, and focus tracking is no faster than walking pace.
This may be why Nikon are economical with the truth saying no AF in older cameras using slower than f5. F8 performance on the newer officially f8 bodies is better, but still far from what I regard as good with my with a 2x.
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