The insides of the models varies, but they are all look almost identical on the outside.

The body of the camera and shutter may be of metal or plastic construction.

Plastic colors vary by model. Metal is always brushed and light.

The battery door and film back with rollers is always made of black, light or dark grey painted metal.

Cameras with a scene selector switch also have a film speed dial.

Combining both gives you a few more shooting options for your film.

Remember to turn the L/D dial compensate for YOUR film speeds.

Always set to the appropriate setting unless you are after a specific effect.

Without a scene selector, your choices are only 75(color) / 3000(bw).

Besides a few color changes, there are four different finder styles.

The Zeiss finder and the 2-window folding can be swapped between cameras.

Small circular window for split-image focusing; larger viewport for parallax framing.

Folds down when camera is closed and fits into the front cover.

Can accept portrait and closeup kit "goggles" for non-zeiss models.

The "top of the line" viewfinder for Polaroid cameras. Folds down when camera is closed and fits into the front cover.

Single window with split-image focusing and bright line parallax correction.

There is a rare larger viewport version only found on the early model 250.

Can accept portrait and closeup kit "goggles" for zeiss models ONLY (usually noted by letter "A").

Does not have any real way to focus. An arrow moves up and down as you focus, pointing at a relative distance, while another remains stationary.

You use these 2 lines to size up a human head for portrait photography.

Can not accept any portrait or closeup kit.

Small circular window for split-image focusing; larger viewport for parallax framing.

Same as the folding one but the front is angled which wont allow the use of any portrait or closeup kit.

The lens elements are either plastic or glass.

Typically glass cameras have screws holding the shutter to the bellows, plastic has lock washers.

Its a personal preference which is better for your photos.

Plastic can be scratched, even by cleaning. Glass is more resilient to upkeep.

Glass lenses are 3 element and plastic is 2.

Only the metal body models will have a tripod socket.

It is not centered but off to the side a little bit.

Some models have development timers built into the backs.

Neither of these timers are perfectly accurate after decades. But who cares, most film is self-terminating anyway.

Be careful that your film isn't difficult to pull because the timer presses on the pack.

The electronic timer can be set up to 120 seconds. Just don't expect it to be perfect.

The timer begins automatically once you pull the film.

A small switch inside the film back trips the timer.

It lights up during the time and it ends with a beep!

Always requires a 3v source just for itself.

The mechanical timer can be set up to 120 seconds.

Though, more than likely its going to be slow so don't count on it.

Takes a second to understand how to set, and can be accidentally tripped, so don't set it until you are ready to pull the film.

All but the BigShot do not have any real way to focus.

There are distance estimators and focusing aids of various types only.