For about £110.00 you can buy the Seculine TwinLink kit (1 x Tx + 1 x Rx). These use both IR and radio and will work up to about 150 feet indoors, 600 feet outdoors.

Here's a comparison between the Pocket Wizard and the Twinlink kit.

The Cactus V5 product is cheaper but as far as I remember, all previous versions have had their issues.

Synch speed of the Twinlinks might be a bit slow. Mine work fine at 1/125th and 1/160th, but at 1/200th they don't work.

Having re-read your requirements, the MZ-6 fails to meet them on 2 counts. As far as I can tell from the manual, it has no mirror lockup function, neither does it offer continuous AF.

You can set the film leader to remain out when rewinding a film though.

Aside from those shortcomings, it's still a very good piece of kit and even allows the use of P-TTL flashes, and Pentax wireless flash.

Go for an MZ-6, it's an outstanding camera.

You can remove the cap easily with a rubber lens bezel removing tool, or an elastic band. Just grip the cap and turn it clockwise to unscrew (left-handed thread).

Good job you have a camera with good low light capabilities then.

A Barbour would have kept you warm and dry though.

Yes it does Roy, but it's not in one relatively small and neat solution.

Perhaps somebody (Stefan) knows the maths to work out the magnification for any given extension? I feel a drawing coming on

Yes, I saw those yesterday Gareth, thanks.

John, I think that Canon lenses are of a larger diameter than the Pentax mount which might make marrying a C lens to a P body somewhat challenging. The 40D is actually a very good camera with a 10Mp CMOS sensor, live view. My son produces some really good work with his 30D, and the 40D is better.

The lens I mention produces images having up to 5x magnification, which is what I'm interested in. It would be a dedicated macro setup and as such, losing infinity focus is no issue.

Apart from the Unicorn like FA* 200mm macro lens, I think I have all the Pentax macro lenses I'm likely to use. I've produced some very good (IMHO)macro images and yes, further magnification can be obtained with tubes/bellows, but it is a bit of a pain.

This is only really an experiment and may all come to nothing.

Thanks for all your replies. I'd really like to hear from somebody who's actually used Pentax lenses on a Canon body, but maybe none here are brave enough

I'm thinking that MF and stop down is necessary, which would rule out using the DA lenses as they have no aperture ring. We'll see.

Has anybody here any experiences to share about fitting Pentax K mount lenses to a Canon EF/EF-S mount body?

The reason I ask is that I have been offered a low mileage Canon 40D body + grip at a very reasonable price. My eventual aim is to acquire a Canon MP-E 65mm 1:2.8 macro lens which will be the only Canon lens I buy for it.

So I'm wondering if some or all of my Pentax lens collection can be used with one of the various adapters that are available, some of which give AF confirmation, some not.

I'm not switching to Canon, I'm just curious to find out how a 1:1 - 5:1 macro lens performs as I've seen some encouraging images taken with it, albeit on a much higher spec. body.

Barbour jackets have plenty of pockets, but you'll need a pair of green wellies to go with it.