@shian Thanks Shian. I have an Android phone so I'll look for something similar.

Just look at these beauties from a simple search! I can already smell the dusty leather!

pic	Make	Price
	Tewe	$125
	Linoptek	$130
	Sony E-Mount	€ 1.275,00

I have Artemis and it works OK, but a director friend of mine has this: http://opteka.com/optekamicroprofessionaldirectorsviewfinderwith11xzoom.aspx

And we use it all the time, very simple and easy.

I use an old Tewe-Berlin. It looks like the one in the link below but mine also has an adjustable aspect ratio that maxes out at 2.55 scope (very nice to have). I bought it 15 years ago. Nice thing about the Tewes is that the zoom barrel ring is fully exposed. No matter what format I am shooting, during prep I put a piece of tape over the 0-99 numbers and mark where the focal lengths for the format I am working with fall on the Tewe's scale and mark the tape with a ultra-fine point sharpie. I also make a mark to align the to the zero of the Tewe's scale (a sort of registration mark) and note the sensor size (Super16, 2/3rds, MFT, whatever). I then save that piece of cloth tape, or just put another one on top. I end up with proper markings for many formats and as new formats come out I just use another piece of tape... Keepin' it simple!

Even if it's a video job with one zoom, during scouting or shooting I always know if the wide or tight end of the zoom (or my primes, if I have some) will cover what we want to see. It is also a big help to directors to visualize what the frame will actually be (and vain directors love to hang it around their neck).

The Tewe's are old, but have low-ish distortion on the wide end and are very accurate with my method above or for Std 35mm (not Super35) as it was designed. I also have to have a small piece of tape to hold the aspect-ratio ring where I left it, but Tewe's are smaller than the Alan Gordon Mark 5 & the Isco Directors Finder and even with a little tape on it, it just makes me look like "I've done this before".

link:http://www.ebay.com/itm/TEWE-BERLIN-MOTIVSUCHER-Directos-Finder-West-Germany-Near-MINT-/150821300247?pt=LH_DefaultDomain_0&hash=item231da66817#ht_500wt_1411

I picked up 2 Iscos "new-old-stock" really cheap in a liquidation and recently sold them on Ebay. They were big (photo attached), heavy and like the Alan Gordon Mark 4, 5, 6, the focal lengths are covered by a metal housing, making my cheat with the tape for new formats impossible and I found they weren't very accurate. Such finders are not future proof, like my ancient Tewe.

Granted, directors finders are great when working with big cameras, you don't own, but, if all you shoot with is a camera you own and a zoom (ex: GH2 and 14-140) I don't think there are many situations where a finder will be needed (as you'll probably have your camera on you) and perhaps the accessibility of the iPhone app (@shain) might be handier and lighter.

@pundit Yeah android users have that app to i've used it before