This may be anathema to a lot of you but I've just recently started using a Ricoh GX100 as a finder. It's naturally 4x5 (just about) format and 24-72 zoom range makes it ideal for most normal large format lens ranges. The screen on the back is bright and it's simple to test out low angle shots without bending over (good when you have a bad back like me). It also gives you a very good test shot that you can then flip through and compare. I walk around a location and take a quick snap of the compositions I'm thinking about and then scroll through them to assess.
Also, the zoom range has a 'discrete interval' mode. This means you press the zoom in and it jumps to the next focal length. The interval sees to offer a 110 - 135 - 150 - 210 - 300 range of lens equivalents ... they also do a wide angle converter which would give you 80mm at the wide end.
There are a couple of large format landscape photographers I know who have indicated that they wouldn't buy a replacement for their linhof finder as the Ricoh would do as good or better.
Tim
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