Sure you could just add Instagram-style filters to your iPhone snaps, but Holga don't want you to do that, they want you to use a retro-style filter wheel.

And because of this they've just released a iPhone 4 (or iPhone 4S) case with a built-in rotating filter wheel.

The case -- which is available in five different colours -- offers 9 different and crazy special effects and filters without the need for an app.

Filters include: Dual Image Lens: Produces 2 identical images similar to a Holga 2 way split image filter Triple Image Lens: Produces 3 identical images similar to a Holga 3 way split image filter Quadruple Image Lens: Produces 4 identical images similar to a Holga 4 way split image filter 60mm Macro Lens: For taking photos at approximately 60mm from the lens Empty Hole: For taking images with no effect Red Filter with Clear Heart Shape Centre: Reduces absorption of blue & green lights with clear heart shape centre to stand out Red Filter: Reduces absorption of blue and green light Green Filter: Enhances green colors Yellow Filter with Clear Center: Clear circular spot in center to stand out with surroundings in pale yellow to mimic sunset Blue Filter with Clear Center: Clear circular spot in center to stand out with surroundings in blue to mimic gentle moon atmosphere

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