Stacking two (2) Pentax 1.4X HD AW TC's.

Started Mar 27, 2014 | Discussions thread
snostorm Senior Member • Posts: 2,044
Ron. . .

Hi Ron,

The lack of support for the Av conversion is pretty strange, IMO. IIRC, stacking 2 1.7x AFAs resulted in a close approximation of the correct converted Av for the combination with Pentax lenses (and with Sigma lenses with contacts taped to provide a corrected max Av with the AFA). They seemed to be able to get this part right with the AFA.

Perhaps it has something to do with the information transmitted by the Info contact which is blocked by the absence in the AFA. . .


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