While this camera has been out for a long time and has been a bestseller for FujiFilm, I feel it deserves a bit of a review and some hard to find information.
The Instax Mini 8 is the entry level model offered by Fujifilm. The camera operates on 2 AA batteries, something that is quite convenient. The lens focal length is 60mm (the equivalent of a 34mm lens on a 35mm film camera) and has a fixed focus range of between 0.6 meters to infinity. There is a very convenient push button to extract the lens which is a great improvement on the previous models which required the user to simply pull on the lens to open it. Once the lens is extended, the camera is fully operational.
One of the strange features is that it is a "flash camera" in the sense that the flash always fires on every picture. Its recycling time varies from 0.2 to 6 seconds on a set of fresh alkaline batteries. Its range automatically varies from 0.6m - 2.7 m depending on how much light reaches its electronic eye which is located just above the lens.
Ergonomically, the camera also has a few strange features other than its vertically mounted flash tube. Contrary to most other cameras, the viewfinder is located to the right extremity of the camera (when viewed from the back). This might look like a bad decision but it proves to be surprisingly comfortable, especially for users with a strong left eye.
The grip is very comfortable and the thumb rest very well located for users with smallish hands.
The back is completely unadorned with only a mechanical frame counter near the bottom.
Around the lens lies one of the most unusual features of this camera: a light-up exposure meter. There are four small LED's around the lens that indicate the amount of light hitting the subject. The user just has to move the aperture ring to match the meter's recommendations in order to get a proper exposure on film. But in reality, this is seldom the case.
One of the problems most photographers complain about is how hard this camera is to use. But in reality they should complain about how little photographic information FujiFilm gives its advanced users. The camera would greatly benefit from having the real lens apertures and the real shutter speed printed on the back.
After a bit of searching, the corresponding aperture values can be found for the camera.
Here are the values:
Indoors, night - f/12.7
Cloudy, shade - f/16
Sunny, slightly cloudy - f/22
Sunny and bright - f/32
No values are given for the Hi-Key setting but after some approximate measurements of the aperture, it looks like the f/stop should hover around f/8.
The shutter speed is fixed at 1/60 sec.
Here are some non-official instructions that should help in getting the best out of the camera.
-The exposure meter will lie, use an external one.
-The flash is there only to prevent blocked shadows. If you know how to reduce contrast without it, don't be afraid to cover it with something dark.
-Instax film has a sensitivity of 800 ISO.
-Instax film is very sensitive to strong light. Shooting a scene with the sun visible can result in a dark circle on the photo where the sun is located (solarization).
-The lens is not the best Fujifilm has ever made. The photos will be a bit fuzzy mo matter what you do.
-The lens is also very soft, try and not put any dirt on it as it will be difficult to properly clean.
With this information you should all be able to use your Instax Mini 8 to its maximum.
Enjoy!
Happy photography to you!
References
http://www.fujifilm.com/products/instant_photo/cameras/instax_mini_8/#features