My Technika III (5th version, with graflok back and tapered cover/base) came with two ground glasses:
- the original one, with grid (unfortunately broken in two pieces!)
- a replacement one with no grid, of the same thickness, but possibly with a finer "grain" (a little more luminous though with less differentiation between in/out of focus)
NO fresnel, either separate or in one piece with the GG (as in my Pacemaker Speed Graphic).
No traces or any other evidence that it ever had a fresnel before... and the same holds true for the Technikas used by some friends.
I think that the ground glass you got is thinner than the original one.
It is NOT a big problem, as the ground side, where the image is formed, sits on the same plane of the old glass.
The best answer was already given: shim the GG where it is held by the clips.
You just need some cardboard to firmly seat the GG in place.
If you want to go the fresnel route, you don't have to spend much money.
With a 4x5" camera and a 150mm lens, there are good chances that a cheap fresnel (one of those flat reading lenses), cut to size, would work more than OK.
Of course it must be fitted behind the GG.
If you have a small saw at home, it would be almost as easy as cutting cardboard shims, and cheap enough to ditch the fresnel if you find that you don't like how it works.
have fun
CJ
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