7Artisans 60mm F2.8 Macro lens has few useful features for Macro shooting. In this article I’m exposing more details on them and also partially disassembling mechanics to show internal mechanics.
Focusing distance test
I’ve focused lens to minimally possible distance and measured it – 10″ 9/16 which is about 26.8cm. There is about 3″ of space between target and lens tube.
After removing metal tube distance to target from the lens is about 5″ which is more convenient for taking pictures of small insects.
When 7Artisans 60mm Macro lens is focused at 28cm distance (and tube is detached) front element is completely hides inside lens frame.
Focusing to longer distances is moving optical core closer to sensor. In this case some internal mechanics is exposed inside, so that detachable tube is needed for better light reflections control at infinity focus.
Disassembly – front area, infinity focus calibration
First step is to unscrew CCW 7Artisans naming plate. It’s nit secured with glue or screws but connected quite tight, so I’ve used rubber ring.
Under that plate there are four light torx-head bolts and four black cross-head bolts. For infinity focus calibration you need slightly unscrew light torx bolts only.
Next step of infinity focus calibration is simply putting lens on camera focus at infinity, then slide front part of focus ring to position where infinity focusing at most distant object is precise, then secure light torx bolts. For further disassembly completely unscrew that bolts.
Lens focusing middle frame can be extended.
When focused to infinity frame can be extended even longer. You can see diagonal slots for inner optical core movement during focus ring rotation.
Here’s the look from the front.
Disassembly – rear area
Rear disassembly starts from trivial removing of three light torx-head bolts. 7Artisans engineer did great job this time sizing bolts in the way that camera lock pin doesn’t catch the bolt head (like it was with earlier 7Artisans 35mm F1.2 lens).
Under the mount ring there are three cross-head bolts – unscrew them. Note – there are additional screw holes for mounting m4/3 ring.
7Artisans are using similar to other lens aperture transmission ring. It connects outer aperture ring to inner lever.
Gently pull out the transmission ring.
Aperture transmission has huge lever due to long movement of optical core with aperture module inside.
Closer look to rear optical area focused to infinity.
And here’s how it looks when focused to 26cm – whole optics travels far to the lens front – that is why 7Artisans 60mm F2.8 Macro lens is so long comparing to non-Macro lens. You can see how much space is appearing between rear glass and camera chamber – it is a lot of air is flowing through the focusing slots. Fortunately there are many holes so lens is easily ventilated during focusing. But don’t focus rapidly in dusty environment with front detachable tube removed – it will lead to intensive collecting of dust inside lens surfaces and in camera chamber.
Assembly steps are just following explained process in reverse order. 7Artisans engineers made mechanics quite intuitive at this points.
I like that 7Artisans 60mm F2.8 Macro lens has relatively easy access to infinity focus calibration and tuning that can be done precisely with minimal effort. Internal mechanics looks solid and well designed – like it is done in 7Artisans 55mm F1.4 lens.