That's what happens when you wander off mid-post, Matt gets in there first!

With a far more comprehensive reply, I have to say.

Dan

The CS205 connection is simply a 2.5mm stereo jack plug. A closed circuit between tip and ground will fire the shutter, between ring and ground will activate the autofocus.

So any circuit which closes a contact, either electronically or physically, should be able to be used to trigger the shutter and/or activate autofocus.

Have fun and post your results!

Dan

You're a credit to Pentax and to Brentwood Peter!

Well done.

Dan

Ahh, didn't realise...

Dan

As this is a f/2.8 lens I would expect it to fetch more. I recently ebayed a Tokina 80-200 f/2.8 PK (not A) mount for around £80. I would think a PKA mount version might sell for 50% more, as it's more useful when used with the K10D.

Dan

http://www.amazon.co.uk/gp/help/customer/display.html?nodeId=1161016

I would say you would think you've been sent a defective item. Halfway down, on the right hand side of this page is a 'contact us' link, which promises "Express customer service or contact us by e-mail or phone".

Dan

But I fail to see how "Digital Multi Coating" can possibly equate to "the particular needs of digital imaging". As far as I'm concerned, there's no difference between film and digital until the light exits the last element of the lens, and the angle at which it does so, and the reflectiveness of the rear element, are the only factors that, I feel, can have a 'Digital' design.

Anything in front of the lens cannot change the way light behaves towards a digital sensor specifically.

By the way, that description of the Jessops filter sounds very much like that of the Hoya.

Dan

No worries!

Dan

That quote should of course have just said 'Mannesty wrote'. I whole-heartedly agree with you as regards which filters are useful and which are not.

Dan

The Hoya website proclaims:

"Digital Cameras Need Multicoated Filters
Digital camera CCD or CMOS sensors are highly susceptible to reflections - this stray light can ruin your photographs! Don't risk your valuable photos by using bare-glass filters."

What they're doing is using the fact that light can be reflected from the sensor, onto the rear element of a lens, and then back onto the sensor again (hence "susceptible to reflections", in order to justify a "Designed exclusively for Digital Cameras" filter on your lens.

This is so that people either think

"I've got a digital camera, therefore I need one of these digital filters"

or

"I've got a decent filter from when I used film, but that's not going to be good enough for my digital camera".

Both of which are rubbish, so it's all about marketing, or as Mannesty put it so eloquently "Digital Filter = 100% BS (BU*L SH*T)"

I'm not saying multi-coating isn't good, or that these Hoya filters aren't up there with the best, just saying they're lying to sell product to unwary customers.

Dan