A little question that I need an answer for please
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411 posts
17 years
Wakefield,
West Yorkshire
I recently acquired a Pentax 1.7x AF adapter, which I want to use with my 100mm and 300mm manual lenses. Now, when I have used these before, I have dialled in the focal length of the lens into the camera. With the adapter, should I dial the original focal length of the lens or should it be multiplied by 1.7 - so 170mm for the 100mm and 500mm for the 300mm?
Thanks.
Naim