I am referring you to the items that were contemporary with the lenses themselves. And I'm suggesting that it might be a good idea to use these screens if its possible to adapt them.

They are no more dinosaur than the lenses as they were provided at the time. The lenses too are not available any more. 9/87 refers to the copy of the book that I happen to have in front of me. This means September 1987 and there are both earlier and later editions.

As for what people want to do, that is entirely up to them and I'm sure they have all the information now in this thread and others that they need.

Pentax Lenses and Accessories, 9/87, page 77.

I think the confusion here may be one of nomenclature, or how it's being described.

Clearly we can't see more or less DOF than actually exists, but there is a limit to what the eye can differentiate. Even a 35mm viewfinder is too small to accurately assess DOF in a shot. What looks sharp at 36x24mm will look rather less sharp at 20"x16".

Don't forget that even 10x8 users would routinely use a magnifier to assess the poiunt of correct focus with their huge ground glass screens.

Crikey Algi, you have some prodigious memory there!

1959 was the first superb summer I remember, followed by I thought 1976...or was it indeed 1975?

PS The apple is there for scale and not included!

[IMG]http://i240.photobucket.com/albums/ff250/johnriley1uk/007-Metal-Case-1.jpg[/IMG]
[IMG]http://i240.photobucket.com/albums/ff250/johnriley1uk/008-Metal-Case-2.jpg[/IMG]
One substantial metal case for sale, with strap and two keys. The second picture shows one of the clips circled - this is damaged and needs glueing back in and really needs replacing. It could be discarded and the case would still function just fine.
An ideal case for bulk storage of all the excess items, lenses, bodies, etc. or indeed a good studio case that open for excellent access to all contents.
Pice: £10.00 plus £12.00 shipping in the UK only.
Regrettably, the case is too heavy to be sent Small Packets so no overseas option this time. It would not be worth paying maybe £75.00 for courier shipping.

All well and good, but why not look for the proper Pentax screen that was made for the job? It will just click into place if you use it with the right camera.

We probably all think we have superb eyesight and we probably all think we're great drivers as well, but in reality there's a huge variation.

I do notice that quite often photographers will seek out esoteric solutions to problems, but the simplest answer lies in the range already supplied by the manufacturer of the camera.

Just so there's no doubt, this is a generalised comment and I do not have any particular person in mind.

There are two things there Smeggypants - first, someone might have better eyes than we do and second Pentax made various focusing screens. It is possible that a user could be using the correct screen for wide aperture lenses.

I'm not a fan of using other makes of screen that were never intended for the camera in question, even when cut down to size, the thickness could be quite wrong.

A rangefinder is only more accurate than an SLR with wide angle lenses. That's why there was always a limit of 135mm for rangefinder lenses. Beyond 135mm, rangefinders are little use. SLRs are more accurate to focus when longer lenses are used.