Toyo-view 158x158 off-centre lensboard ?

[gorannil]

I need (even if I can Do without it) a Toyo-view 158x158 off-centre lensboard for my Grandagon 115/6.8 and Toyo 810M.

Is there a non-drilled Such Lensboard to get.
(I could not find any at www.toyoview.com.)

Or do I have to modify an allready drilled one.

An how to do this ?

Drill another hole and then cover the first one ? (Einstein)



/Goran Sweden

[L&Scape]

Göran,

You should have a lensboard without a hole to enable off-centre drilling. You can also ask local machinist to close your Copal 0/1/3 lensboard by welding, then drill or lathe a new opening according to desired measurements.

I have the same camera and I also have a metal job shop that can do the job for you should you not find any in your neighbourhood. (Toyo do not offer lensboars without drilled openings, which surprises me.)

[gorannil]

1.)
Yes You may cover the hole first and then drill the new one.

The material should be "die-cast" (www.toyoview.com) some sort of aluminium alloy.
Not so hard to drill (could do it myself).

But welding ? then I must have something to weld in the hole a same size-aluminium-circle ?

2.)
Or else I may do it somewhat easier:

See Image below

a.)
First I drill the new hole 4cm off centre.
I can buy a 38 mm drill here that will work for metal. Then I file to 42mm.
The new (prontor #1) hole is 42mm and will come just above the old one
which is 35mm if I get a shutter #0 lensboard to start with.

b.)
Then after drilling I fill the #0-hole with something
(I do not know what) but not welding and not hard-silver-soldering.
I have to find out something else.

I may use the circle that I drill away and file it down to 35mm.
I may even have It welding in place ?

/Göran Sweden

[L&Scape]

Why don't you make it simple and use your camera's front rise and shift.

[gorannil]

(I am planning to try some churh-images with quite vertical back.)

I think I can manage to get the lens sharp (I have done some calculations and one field-test) over large angles above the horizon.

So I have to have the horizon (= lens position) in the uppermost of the ground glass
(and then I will fill the 8x10" film all the way down).

I can manage to get this position (or close to it) with "lens-rise" + "Extra-indirect-lens-rise" (tilting the camera and then tilting back the Front and Back).

But I want to be able to do it without the "Extra-indirect-lens-rise". Wich is rather cumbersome.

/Göran Sweden