I just don't know what to say , I was very impressed by the Canon
version . This Pentax version has issues , and the reader may chose to
stop reading right here as I don't recommend this one at all . The auto
focus does work , but what does not work is the aperture , and this is
kind of a deal breaker for Macro in a big way .
The first set of pictures is from my K20D and the second set is from my
istD , and as can be seen even though a certain F stop is reported there
is no actual physical result of the change in the aperture . This is a
real shame I have to say , because Pentax fans have wanted something
like the Kooka Tubes for a long time .
Now unfortunately things don't end here , another issue is installing a
lens to the tube . It can be extremely difficult , and in some cases not
possible at all . In fact I completely failed in my attempt to
install a Pentax 18-55 kit lens , it simply refused to go on .
The two lenses that did go on were a Sigma 28-80 and a Sigma 50mm , and
both lenses were extremely fiddly to get on the tube . The tube to body
fit was not nearly as tricky , and was comparably easy compared to
installing a lens . Funny thing , with the tube in the body I was not
able to get any lens on . I had to install the lens before putting the
tube on a camera .
I can in no way recommend this product , and I would rate it as being in
BETA , and it may take some time for the manufacturer to iron out the
issues ( if ever ) . So if you are desperate for a cheap AF tube
that works , you may wish to switch over to Canon cameras as the Kooka
tube for Canon I tested works really well .
So there you have it , interesting but very disappointing .
And just in case you were wondering , in no way shape or form do I
recommend the Kooka Tube for Pentax .
Important Update : 30 August 2016
Well , I thought it only fair to try again . This time I put the
Kookatube on my Pentax K10D . I was a little surprised to see that
aperture was working now .
As can be seen , aperture is actually working . I did wonder if it was
just the lens or not , so I replaced the old F-zoom with a 18-55 DAL ,
and everything seems to be working just fine . Ok , so one camera out of
3 ? I just have to wonder if the Kookatube is just new , and needs
some working in to become functional ? I will have to try the K20D
again , and the same goes for the istD ( Just to see if they are working
now ) . It would be great if this tube worked with all Pentax bodies
rather than possibly 33.3% of them ( ? )