[Q] Pentax 1.7tc with 60-250

Started Apr 21, 2012 | Discussions thread
brandrx Forum Pro • Posts: 28,337
Re: [Q] Pentax 1.7tc with 60-250

doak wrote:

kim_hdr wrote:

the focal lens is use for shaking Reduction system of the body, so maybe you should enter 1.7 x 250 if you use the longest length ( maybe you do, that reason you add a tele converter )

Thanks, yes that's what i've been doing.

What is the logic for not passing an adjusted FL from the adapter to the body? The aperture is adjusted.

There is no connection of the data pin from the lens through the 1.7X AFA so there is no way of telling the focal length of the lens. The only way that the 1.7X AFA can work is to short out the data pin of the lens.


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