It's probably why they haven't brought one out. It would
almost certainly need at least one extra contact on the TC
and camera to indicate that a TC was there. But even that
wouldn't be enough it would also need to pass the factor
1.4x or 2.0x etc.

It's required not only for the SR, but also for the
aperture.

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From my POV the first thing Pentax need to do is resolve how to
let the camera know that a TC is attached and adjust the focal
length to the correct one for the SR...... but no one's asked
for that or even looked at the existing contacts to see if
anything can be done to make the camera let you set the
FL manually.

It's pointless asking for a TC without a camera that
can use it properly.

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Most currently available TC's pass ALL the electrical contacts straight
through. Pentax can't improve on that with a new one.

Optically the Tamrons/Teleplus TC's are quite good. Unlikely that
Pentax can do much better than that with a new one.
It is after all just a magnifier

They may be able to tweak the AF in the camera to work better
with a TC including tweaking the SDM...... but you haven't
asked for that. Something to moan about later if they ever
release a TC.

The Pentax 1.7x adapter works well with the DA*300mm and there's
was one for sale here last week for a very low price.

I prefer to use the 55-300mm or Sigma 150-500mm with the
Jessop 1.7x TC.

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He must have a noisy camera....
He's wearing Ear Defenders

--

The next camera will be a 6x6 TLR DIGITAL and it's not
a rumour it's actually shown 16secs into this official video

http://www.youtube.com/watch?v=vs8mhoVML5g

Made for street photography in all conditions.... built in
snow plough and a portable 1:1 scale model Red GPO Phone
Box to plonk anywhere you want in the street so that you
won't be spotted

The purchase of Pentax is shown at 4min 30sec.

I'm impressed with the man who can light up bulbs
with his fingers at 4min 38sec.

--

Season's Greetings From Your Friends at Ricoh

http://www.youtube.com/watch?v=g8uiptLygv4

--

There's 15 secs. between the two dog shots and they are both
taken from the same spot. So a very rigid tripod with a fast
QR must have been used.

They are both 24MB cameras so I wouldn't expect much difference
in sharpness. You can't really compare 3D images from 2 cameras
they will never be focussed on the same point and +/- 7mm can
make a big difference.

The bokeh which really depends on the lens used even though
the D600 will have more OOF pixels looks better to me with
the Pentax 55mm which is a surprise considering the other lens
is an 85mm which usually has nice bokeh.

If you were to make screen sized files I wouldn't think there
would be much difference between K-5.... K-3 and D600

--

There are loads of 1.4x to 1.7x TC's available SH
Why would you want another apart from having a moan!

--

If you can't find any suitable rubber sheet to use as a packer.
I'm sure that the silicone baking trays sold in the likes of
Poundland would work if cut up. Some are even ribbed.

Smaller bits of rubber can be obtained from old turntable belts.

Rubber roofing felt is ideal, but hard to come by.

--

That's the problem! ....... I thought they used
a rowing boat!

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