0-35mm variable extension tube for wideangle macro (Canon EF/EF-S lens, Sony F/FE camera)

Description

This variable-length extension tube allows you to mount a Canon EF/EF-S lens to a Sony F/FE mount camera. When you twist the middle section of the tube, it expands to vary between 0mm and 35mm of effective extension. When used with a 35mm lens this allows you to focus from infinity up to 1x macro magnification. Since this tube allows you to go all the way down to 0mm of extension, it allows even ultrawide lenses to be used for macro (e.g. the tube allows you to use just 7mm of extension to suit a 15mm lens). Although your subjects will be just millimetres away from the end of the lens! Shooting macro with wide lenses allows you to include more of your subject's surroundings in the image, as there will be detail in the background instead of it being a featureless blur. I'm shooting with Canon 35mm and Samyang 14mm lenses, but other SLR lenses can be adapted with a cheap metal adapter ring to Canon too, including Pentax K and Nikon F. Filament should be black PETG or similar (PLA likes to deform under pressure, which can loosen pieces over time). Please note that your PETG should be nice and dry to minimise stringing, since some of these strings would end up gumming up inaccessible threads. TPU filament is required to print the spring for the Canon lens locking mechanism. I'm using Flexfill 98A. Extra parts required: - M2x10mm cap head screw x1 - M2 hex nut x1 - M2x6mm screw, black finish, x3 - M3 hex half-nut/jam-nut, brass x1 - M2x20mm countersunk screw x1 - [M1.7x6mm plastic self-tapping screws x2](https://www.amazon.co.jp/gp/product/B00MIA7EHC) - Silicone grease **Please note that the grease used in this tube is super not good if it comes into contact with optical elements like your lens or camera sensor. At the very least this will require a wet cleaning of your camera sensor, and in the worst case this will render your camera into scrap.** Take care. ## Shooting with the tube To mount a lens to the tube, align the Canon lens' alignment mark with one of the two circles on the top of the printed mount (one for EF lenses, the other for EF-S lenses), and push the lens downwards slightly to push the lens locking plunger out of the way, then twist the lens onto the mount as normal. You may need to press upwards on the bottom of the 10mm lens locking bolt to return the locking plunger to the locked position (which prevents the lens from unscrewing). To mount the tube to the camera, align the hex nut on the mount face of the tube to about the bottom of your camera mount, and twist it on until the camera's lens locking pin engages. You can twist the centre section of the tube to collapse or extend it. The collapsed position corresponds to 0mm of extension for Canon lenses, so you will be able to focus to infinity. Max extension is 34mm, so you'll get 1x magnification when shooting with a 35mm lens. Shorter lenses give stronger magnification and longer lenses give weaker magnification. To disengage the tube from the camera, note that the extension tube overhangs your camera's release button enough that it's impossible to get a finger in there to press the release button (I've included a photo in the gallery above). I pressed it with a toothpick instead. To remove the lens from the tube, looking from the bottom of the tube, use pliers to pull downwards on the head of the 10mm locking screw, which will retract the lens locking plunger, then untwist the lens. ## Looking to go longer? I also have a version of this tube which extends from 50-150mm, for shooting at 1-3x magnification with 50mm lenses: https://www.thingiverse.com/thing:4941924 (it can no longer focus to infinity, though) ## More macro accessories Pictured in the photos above are my [Twin Loc-Line Arm Mount for Camera Tripod Sockets](https://www.thingiverse.com/thing:4652788), [Diffusers for Canon MT-24EX Macro Flash](https://www.thingiverse.com/thing:3844481), and [MT-24EX mount system for Loc-Line arms](https://www.thingiverse.com/thing:3785376).

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