Geoff that's some years ago now it all counts what papers you've.
The profession engineer (and technician?) is as far as I know protected so you can not call yourself one if you don't have the qualification.

Of course there are ways to self teach you photography and if done correctly it wouldn't be so hard to do one test right.
All just for protecting the market.

that could be it, strobes don't cancel it out because you use equipment to defuse the light, also the background can bounce the light of to objects in the room.

Luckily Dan is awake

Reversion would be problematic with distance, don't know how good long focal-length + extension tubes is.

Katz eye use the same method as most others.
They buy fullframe screens and cut them down to size.

Katz-eye use the Nikon K3 screens so if you get the standard version there would be little difference between other brands.

Katz-eye have the opti-bright so that makes them different but like you said with that and third rule option you come to an amount of $205.00.

The focusingscreens are $77.35 with rule of third they don't have the opti-bright. Although I think $127 for a coating/treatment is quite a lot but that's for you to decide, it might certainly be worth it.

Also don't forget the tax and shipping you need to pay with both.

Mike you can get yourself one of these link
That way you have control over the colour on your paper regardless the brand or type of paper & inkt.

Yves (pentaxian450) use them so you can ask him more if interested.

Now we are running against another problem, the profession photographer isn't protected any more and anyone can call themselves that.

They need to protect that profession again so that you need to have the right papers to be a photographer. Still it does say nothing about the quality of the photos but at least the paper shows someone has the or needs to have the knowledge and you also make the market smaller, since that's a big problem.
Amateurs who are good at photographing or get a lucky shot are taking away the market for the professional photographer who needs to sell his photos to get food on the table.
Also the harm done by so called professionals who think they are because they have the gear and hire themselves like that isn't pleasant either for the "real" pro's.

I'm not a professional and won't go to lends to call myself that, semi-pro isn't the word either, enthusiastic amateur suits me the most and many of us here.
So I don't have the great understanding of the professional world but I hope I've laid my finger on the problem here.

Indeed great to hear, hopefully you get some good light on your way

That would be triple if you've the focusing on single focus then it does a double check on his own. That's one reason Pentax focus slower then other makes.

Here is a comparison between Focusingscreens and Katz Eye link

Ah yeah never mind, since you wrote Katz Eye a lot I thought you where suggesting that it was better.