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  #1  
Old 30th September 2023, 04:50 PM
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Default 6x9 Ground Glass Mask

Could somebody please shed some light on how to mask the ground glass on my 4x5 Speed Graphic for use with my 'new' 6x9 Horseman back?

Are format masks commercially available or is it a case of cobbling something together from cardboard, acetate or similar? Thanks.

Richard
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Old 30th September 2023, 05:37 PM
Collas Collas is offline
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If you've got the money then a new screen from Linhof might do the trick. I changed the original screen on my Chamonix as its etching was almost invisible as it had been "inked in". The Linhof has crisp etching and the marking are filled-in with black paint.

https://www.linhofstudio.com/product...d_Multi_Format
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Old 1st October 2023, 09:54 AM
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Collas,

Quote:
Originally Posted by Collas View Post
If you've got the money then a new screen from Linhof might do the trick... The Linhof has crisp etching and the marking are filled-in with black paint.
Many thanks for the suggestion, and if I did have the money this would be the perfect solution.

Richard
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Old 30th September 2023, 05:42 PM
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Hi Richard,
If you don't wish to change the ground glass back for one with roll film holder markings, then I should think it's a matter of 'cobbling something together'.
I've seen lines drawn on the back with both pencil and pen, as well as thin strips of electrical tape. Have fun and get creative!

BTW I didn't know you'd gone for a Speed Graphic! It looks a beauty and presumably the fp shutter is running well?
I'm just waiting on some Sinar lens board adapters for both my Pentac 8" f2.9 and Aero Ektar 178mm f2.5 but a Speed Graphic set-up would have been better...
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Old 1st October 2023, 10:46 AM
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Default Cobbler

Martin,

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Originally Posted by MartyNL View Post
Hi Richard,
I should think it's a matter of 'cobbling something together'.
I've seen lines drawn on the back with both pencil and pen, as well as thin strips of electrical tape. Have fun and get creative!

BTW I didn't know you'd gone for a Speed Graphic! It looks a beauty and presumably the fp shutter is running well?
I have since attempted to fashion a mask from thin card which I intended positioning forward of the GG screen (i.e., lens side). Unfortunately this proved difficult to see behind the screen but worse still, it made closing the Graflok slide clips(?) impossible.

I reckon the mask needs to sit in the recess to the rear of the glass and would ideally be made from something more durable than card.

The camera btw, had long-since been neutered having had the FP shutter removed - who needs two shutters anyway? I have no need for fast speeds, nor do I have the time or inlination to experiment with barrel lenses. It was the asking price and the aesthetics that appealed to me. You will see from the snap below that the missing FB gubbings have been nicely blanked-off as well.

Richard.

PS: Not sure what the red mark is on the front standard but it appears only on the snap and not on the camera.
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Old 1st October 2023, 11:17 AM
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All understood.

Sounds like you're well on the way to finding a solution and putting the mask behind the gg certainly avoids any potential issues with focus shift too.
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Old 1st October 2023, 11:32 AM
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Quote:
Originally Posted by MartyNL View Post
putting the mask behind the gg certainly avoids any potential issues with focus shift.
Martin,

I had reckoned that the card was so thin as not to make any difference, and I tend to stop down and 'focus' on infinity anyway.

Watch me get slated now!

Richard
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Old 1st October 2023, 05:29 PM
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I posted another option on the UK LF Forum.

Why focus at Infinity ? It makes no sense, you focus at the Hyper focal distance if you want to work pre-focused. Then stopping down brings more of the foreground into focus as well as covering to Infinity.

Hyper focal distance is related to Focal Length and f-Stop.

Ian
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Old 7th October 2023, 04:51 PM
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Default Format mask update.:

I eventually came up with the idea of having a piece of 3mm acrylic, laser cut to size. An effective and inexpensive solution, me thinks.

Many thanks to all those that contributed to the post.

Richard
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Old 7th October 2023, 06:38 PM
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It looks very tidy and robust.
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