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2x3 Lenses for Linhof

I guess I just assumed a rangefinder, if a view camera wonder how birght a MF lens will be? I have both Speed and Bushman 2 2/4 by 3 1/4 with 90mm and 100mm lens, when using the ground glass image is rather dim.

I primarily use an Arca Swiss F-Classic 6x9 monorail for shooting 6x9 and digital. The ground glass is reasonably bright with an ƒf5.6 partly because the Arca Swiss ground glasses inforporate a fresnel. With the Nikkor-M 105mm ƒ3.5 it is quite bright, and with the ƒ2.8 Xenotar as well. I even us a 150mm Apo-Ronar ƒ9 as my slightly long lens and its bright enough, but does need the dark cloth.
 
My Crow Graphic came with a Wallensake 135, like Linhof the following focusing arm is matched to the lens, but I traded the Wollensak for Zeiss 135 and it focus just fine. It may be just the luck of the draw.
 
I think it is due to the fact of its actual focal length, not the engraved focal length. Brand x 150mm might be 151mm and brand y is 149mm. Those 2 may not work. Did I say that right?
 
I have the 101mm ektar and I think it is one of the best 100 ish mm lenses I have used.