exa and hooded finder

[j.lukow]

A question for those with more experience than I...

I have an Exa along with the penta-prism / hooded finder as shown in the picture ...


When I have the "hooded finder" installed The camera develops tunnel vision - the field of view is like the "sketch" below ...


Is this a quirk of the gear or an indicator that the finder is missing something?

Thanks in advance for future help.

Jim

[Sciolist]

No Jim, I've just tried the same set up for you and the view is normal. The view you have seems to be of the back of the lens via the mirror in cocked position, which you can see when you have no viewfinder on at all. No offence, but just to eliminate it - are you sure the viewfinder has its focusing block installed ? It's the only thing I can think of at the minute. I'll keep thinking.

[j.lukow]

Thanks for the quick reply . . .
Here is a comparison of the two _ waist level vs hooded . . .


I guess something is missing . . . or is it a separate part?
The one in the waist level is firmly secured and I don't want to risk mucking with it.
The base of the hooded shows grooves and such, as well as 2 pins.

Jim

[j.lukow]

Is this what I am missing ?



https://www.ebay.com/itm/IHAGEE-FOCUSING-SCREEN-FOR-EXAKTA-EXA-PLAIN-GROUND-GLASS-207151/143192933088?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20180105095853%26meid%3D01c0e7c647764f35879428f18ff6e788%26pid%3D100903%26rk%3D1%26rkt%3D20%26sd%3D143192933088%26itm%3D143192933088%26pg%3D2509164&_trksid=p2509164.c100903.m5276

Or is it something else?
Jim

[Sciolist]

^^Yes, from the pictures, the focusing screen you show is missing from your eye level finder. The waist level (hooded) finder, as you say, has its focusing block in place.

[kansalliskala]

[Sciolist]

[j.lukow]

Thanks again.
This answers many things and I can put things into proper order and gain a usable finder.

Jim

[Sciolist]

You're welcome.

These pages may help your choices Jim.


Viewfinders -

http://www.wrotniak.net/photo/exakta/finders.html

Viewing screens -

http://www.wrotniak.net/photo/exakta/system-1969.html

[kansalliskala]

[Sciolist]

[j.lukow]

[Mos6502]

The top of the Exakta focus screen is curved because it is also performing the function of the condenser, which is usually a separate piece in modern viewfinders.

[Sciolist]

[j.lukow]

So after many delays finally got my focusing screen . . .
It would seem that the differences in finders are cosmetic . . .
This said does any one know a source of instructions for installation of the screen?

Looked through what Mike Butkus has on his site and the Exa manual. Mentions the special prism as an accessory but nothing on the actual focusing screen.
There must be a non-obvious trick as it doesn't just "snap" into place and I am not going to force it.

Any experience / knowledge would be helpful.
Thanks in advance,
Jim

[Sciolist]

Pick up the long sides of the screen with forefinger and thumb, curved side down. Hold the screen perfectly parallel above the holder and push it in place. It should require no more pressure than pushing a battery in place.

What keeps the screen in place are plate springs, one fitted on each of the long sides of the holder. The 'spring' part is created by two tangs on each plate. They should be parallel with the sides of the box you are putting the screen into, with perhaps 1mm of movement backwards (to accept and hold the screen). Looking at your picture above, your tangs appear to have a slight twist. Even with perfectly positioned tangs, the screen will only push in place when it is offered up perfectly.

Good call on not forcing it. I'm only going off the picture, but try straightening the tangs a bit better and see how that goes.


Good luck Jim, I hope that helps.

[j.lukow]

[Sciolist]