K-mount adapters for Pentax new-mount cameras

Started 11 months ago | Discussions thread
Barry Pearson
OP Barry Pearson Veteran Member • Posts: 8,723
Re: The size and weight of an adapter

DougOB wrote:

Barry Pearson wrote:

In order to get a feel for the size and weight of the Nikon FTZ Mount Adapter, I've compared it with something I know, the Pentax DA 1.4x Rear Converter.

Nikon FTZ Mount Adapter

Diameter: 70mm (?)
Height: 80mm
Casing size, front to back: about 30mm
Weight: 135 grams

Pentax DA 1.4x Rear Converter

Diameter: 65mm
Casing size, front to back: 20mm
Weight: 126 grams

(I'm not making a particular point here!)

A naive, and possibly stupid, question... does a mount adapter need to have any glass in it? Or simply Mount A to mount B, a bit of a spacer, and circuit/control pass though?

Unless I'm missing something specific to Pentax K-mount, it would have no glass.

Having said that I believe that my K-to-Q converter is much more complicated than that...

Yes, so is mine! But it doesn't have glass in it either.

It is complicated partly because of aperture control and shutter:
http://www.gyes.eu/documents/pentaxqkadapter.pdf

 Barry Pearson's gear list:Barry Pearson's gear list
Ricoh WG-6 Panasonic LX100 Ricoh GR III Pentax K-7 Pentax K-3 II +27 more
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