What Is the Difference Between Instant Camera Film Types | Format Guide

Walk into any camera store or browse online, and the instant film aisle throws a dozen different boxes at you. Some work only in specific cameras, others fry your shots if you mix them wrong, and the price difference adds up fast. This guide walks through every film format on the market, what fits what, and where people most commonly grab the wrong pack. The table below lays the key specs side by side so you can match the right film to your camera in one glance.

Film Format Sizes and What They Look Like

The most visible difference between instant film types is how big the final print turns out. Fujifilm offers three sizes: Mini (the classic credit-card shape), Square (trading cards), and Wide (nearly postcard-sized). Polaroid makes five formats, with its standard square being noticeably larger than any Instax version.

Polaroid’s standard image measures roughly 78.9 × 76.8 mm, versus Instax Square at 62 × 62 mm — that extra surface area gives Polaroid shots a distinctly different feel in hand. The smallest format on the market is the Polaroid Go, with an image area of just 47 × 46 mm, and the largest consumer option is Polaroid’s 8×10 at a full eight inches.

The Battery Trap: Why Some Film Works in Some Cameras and Others Don’t

The single most common mistake people make with instant film involves battery placement. Older Polaroid 600 and SX-70 cameras get their power from a tiny battery packed inside the film cartridge itself. Newer Polaroid cameras — the Now, Now+, and Go models — have their own built-in rechargeable battery, so the film packs they use (i-Type and Go) leave the battery out to save manufacturing cost.

Here’s the catch. If you put i-Type film into a vintage Polaroid 600 camera, the camera has no battery of its own, the film cartridge has no battery either, and nothing fires. The Polaroid compatibility guide makes this clear: i-Type is only for modern Polaroid cameras. The reverse works fine — 600 film has a battery, and modern cameras simply ignore it.

Instax film sidesteps this problem entirely. Every Instax camera has a built-in battery, so any Instax pack works in any Instax camera of the same format size.

ISO Sensitivity and How It Affects Your Photos

Fujifilm Instax film runs at ISO 100 across all three formats, which makes it best suited for bright outdoor light or cameras with built-in flash. Polaroid film sits at ISO 640 for most of its formats — about 2.5 stops more sensitive. This means Polaroid handles indoor and lower-light settings better but can blow out highlights in direct sun if the camera doesn’t adjust.

Pop a 600 pack into an SX-70 camera without an ND filter, and every shot comes back overexposed and washed out.

Cost Per Shot: Polaroid vs. Instax

Price differences between the two brands add up fast if you shoot regularly. A pack of eight Polaroid 600 or i-Type frames runs about $18 to $22. Instax gets you ten shots for roughly $12 to $15. Per print, Polaroid runs about $2.25 to $2.75, while Instax comes out around $1.20 to $1.50.

Those savings make Instax the more budget-friendly choice for casual shooting, party favors, or creative projects where you burn through packs. Polaroid’s higher per-shot cost trades against the larger print size and distinct vintage look many photographers prefer.

Cross-Compatibility: What Never Works

The line between the two brands is absolute. Instax Mini, Square, and Wide film can never go into a Polaroid camera. Polaroid 600, i-Type, SX-70, and Go film can never go into an Instax camera. The physical cartridge shape and internal mechanism are completely different.

Within each brand, the restrictions are simpler. Go film only fits the Polaroid Go camera — the cartridge is too small to load into any other body. Instax Mini and Square packs share the same brand DNA but different cartridges, so a Mini pack will not lock into a Square camera and vice versa.

If you’re shopping for your first instant camera and want to compare how different formats actually look in hand before buying, our roundup of affordable instant cameras shows side-by-side print comparisons and real user feedback on each model.

Storage, Handling, and Shelf Life

Instant film is chemically active and sensitive to temperature. The official guidance from both Fujifilm and Polaroid recommends storing unopened packs in a refrigerator — not a freezer — and letting the pack sit at room temperature for roughly one hour before shooting to avoid condensation on the chemicals.

Once you open a pack, use the film within two weeks for the best color and development. Photos continue to develop and stabilize for about a month after the shot. Keep open boxes stored in the fridge during that window, but never let the developing prints freeze. Between packs, give the camera’s rollers a gentle wipe to remove any dust or chemical residue that can streak across the next print.

Which Film Should You Pick?

The right film comes down to which camera you own or plan to buy. If you have a vintage Polaroid 600 or SX-70 camera, you need the specific 600 or SX-70 packs with built-in batteries — nothing else works. If you own a modern Polaroid Now, Now+, or Go, i-Type or Go film is the match, and either is cheaper than the battery-containing packs. Instax owners have one decision: how big do you want the print? Mini is the most affordable and portable. Square offers a balanced middle ground. Wide gives you the largest image in the instant film world outside the professional-grade Polaroid 8×10.