I sorta wish . . .

[Paul2660]

It's called an OTG cable (for "On the Go"). Here's a link for the android version: http://www.walmart.com/search/?query=otg%20cables . I've seen the Apple version at Best Buy. It just goes from the input on the phone to a female USB so you can plug your camera cable into it.

The best app I've found is DSLR Controller. Here's a link: http://dslrcontroller.com/. It's about $10 but works well and makes most of your camera controls available on the phone. If you want a free one it's called DSLR Dashboard and also works well. This one may only be available for Android. Here's a link for that: https://play.google.com/store/apps/details?id=com.dslr.dashboard&hl=en

Hope that helps. 

Richard.

Thanks. This helps a lot.

Paul

[dwswager]

Richard.

Thanks. This helps a lot.

Paul

Paul, I lost the ball on this part of the thread, but the device you are using must have USB Host Controller capability.  Just because it has a USB port does not mean it can act as a Host.  For example, my Samsung Note 2 phone has it.  Samsung Tab 3 7" tablet does not, but the larger Tab 3 tablets do.  As I am aware, the  iPhone 4s and down don't, but the iPhone 5 and up does (though with Apple it might be squirrelly). Lightning is a proprietary connector for USB.

[BJL]

However a better, if slightly more involved, solution is to use your phone or a tablet for a display. It's bigger (unless you have an old iPhone) and probably better quality. It can be done with a simple cord (or wireless if available) and a very inexpensive app. And it's more versatile than a flippy screen.

Yes, that could be a nice option too; especially with a fast wireless connection.

I would still like there to also be the option of "one-eyed composing" on a tiltable EFV with a comfortable, light-blocking eye-rest, for those camera-holding and lighting situations where that works better than the "two-eyed" options of composing on the screen on the back of a camera or on a phone.  Surely some of the people shooting hand-held on DSLRs would like that.