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Question about the 8X10 film holder

OoRAYoO

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Hello,I am diying a 8x10 camera but the specs of film holder on google make me confused.According to the specs below,exposure height+distance to the exposure field is 10.026"+0.775"=10.801".The retaining tab location is 10.85,so the gap between tab to exposure field is only 0.049" left?Any one can explain it for me?Thanks very much.
 
OP
OP

OoRAYoO

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Shanghai,China
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This pic is standard 8x10 holder,it shows the distance from retaining tab to the exposure field is way more than 0.049"
 

GKC

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I'm confused.
Retaining tab? I've always heard them referred to as the locking ridges
The retaining tabs being the metal "L" that holds the dark slide in place.