Yep! £69 for the sharpest 1.4x for Pentax.... the cheap
Pentax-A Takumar 2x's were going for that 2 years ago

They wouldn't need to design a new model just add Pz contacts
to the A 1.4X-S and leave the pins as they are. It already
asks for the focal length so that would be all that's
needed. It's only a magnifier at the end of the day

'

Then why did they have to use the Pz contacts for the SDM
drive? That seems to have caused most of the TC problems.
Some work some don't even though they have the Pz contacts?
None of the 2x TC's work with SDM even though they are the
same as the 1.4/1.7's that do.

'

They could do that I suppose, but it's not very user friendly,
and it would allow existing Tamron/Kenko TC's to be set as well,
and Pentax possibly wouldn't want that.

They will also have to use something similar to whatever Canikon
use? I've no idea because I've only used Pentax.

The firmware on the K-5 may also be fully allocated.

'

It would need an extra pin on TC and camera to signal
that a TC is attached and possibly another pin to
say if it was a 1.4x or 2x TC.

'

I've got TWO of the Pentax 2x-S TC's.... paid about £100 each for them.
I'd sell one now except I wouldn't get anything like £100 for it.
Top quality TC as well.

'

Static price for years means there isn't any demand and the price is actually falling due to inflation. If you compare that with lenses that are in demand such as anything with Carl Zeiss on it they have rocketed over the last few years particularly Contax stuff. Even East German M42 stuff has shot up. I paid £70 for a Carl Zeiss Jena Flektogon 35mm F2.4 a few years back and thought that was expensive, but they are now going for about £175 ebay_completed_sale 42 bidders as well.

The Oly 1.4x is about £360 a Pentax one would be at least the same, but it wouldn't work properly on the current range of cameras, because there isn't anyway of passing the signal to multiply the lens FL by 1.4x. It would need a re-designed mount and in camera software which could well be on the way.

They obviously won't release a TC which won't work on the current cameras.




'

And how much did you buy these 3 or 4 for?

'

One big advantage with the Eye-Fi card is that if you have a lot of images to transfer, you can just plug the card into a PC reader and the Eye-Fi software will find it and import all the files very quickly at USB Speed. You don't have to touch anything it's automatic. I don't do it but I assume that it will also forward them to the internet.

I use a free program called Netmeter to show an internet speed/time graph it also shows Eye-Fi card acivity.... speed... how many files transferred etc.

http://www.metal-machine.de/readerror/

'

I'm just waiting to see what price a Pentax Rear Converter-A 1.4X-S goes for tomorrow in Australia.... currently £60 I have one (so I'm not bidding). No AF but it has the A contacts and is sharper than all the other Kenko/Tamron TC's... also it lets you input 420mm with the DA*300mm or 55-300mm lenses which I don't think other TC's do.

The 1.7x Adapter has hovered around £240 SH for donkeys years and a few have gone for about £150 so very little demand there

As Spike Milligan once said " It's only the hair on a
Gooseberry that stops it from being a Grape!"