So, in summary:
- device works great, and I'd recommend it to people with more recent phones
- having control of the exposure setting would be key; e.g. using the 90-degree mirror is almost impossible with the LED because the bright spot of the LED reflecting against the 90-degree attachment makes the camera's auto-exposure adjust all the way down to minimum exposure, which makes the scene you are viewing very dark. If an item comes in to the foreground of the camera and catches the LED light, the same thing happens: the main part of the image goes black as the exposure is dialed all the way down. Manual exposure control is a must-have feature, and would be easy to add in a software update, I think?
- the adjustment dial for the LED brightness is too touchy, but that's a relatively minor complaint
- I did notice that the displayed aspect ratio of the image (at max resolution) was wrong on the XR, so the image is stretched/squashed. Not sure if the recorded videos have that issue, but I expect they are fine. The aspect ratio seems fine on the 5S.
OLD REVIEW FOLLOWS:
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I'm rating at 3 stars for now, because I'm talking to customer support. They seem solid so far, and I will update this review as things proceed.
My unit seems well built and works fine as a live view camera. The app is nothing special, but it is working to view the live feed. I haven't tried it with multiple devices monitoring the camera. Unfortunately, there are problems with the recorded files. They do not play back correctly in the app: lots of green banding and such.
Still photos are transferred to iPhoto correctly. Videos are not transferred at all. At least in the high-res mode. I got one to transfer at 1920x1080, but it had the green banding just like the high-res videos.
I may just have a bad unit, and if support does the right thing, I'll update this review with that info and will adjust the star rating accordingly.
Lastly: the dial to adjust the LEDs is not calibrated well (or there is poor quality control on the potentiometer): it turns via four or five motions of a finger over the wheel, but the LED goes from full bright to full black in just the first pass over the wheel, making the LED levels almost impossibly close to each other as the wheel rotates. Very delicate to adjust them, and the brightness level easily gets out of whack.
I'd also appreciate some control over the exposure of the camera: if a leaf or anything else comes in to the foreground when the LEDs are on, the exposure adjusts downwards and the main image is invisible. I'd rather have the foreground leaf blown out white and still be able to see what I'm looking at. Of course it should be adjustable, because sometimes the leaf _is_ what you are looking at.
I understand the desire to make an idiot-proof device, but an "advanced settings" tab for stuff like that would be really appreciated.