(moved) labeled lensgear-set for Geared Follow Focus

by MarcusWolschon, published

(moved) labeled lensgear-set for Geared Follow Focus by MarcusWolschon Jul 17, 2011


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This is a parametric set of lens-gears for a follow focus.
Compatible with industry standard follow focus systems.
(Yes, these things cost an arm and a leg in shops.)

pitch: 0.8

tooth: 97

all gears have the same outer but different inner diameters.
(You you need not adjust your follow focus when switching lenses.)

All gears have their nominal inner diameter labeled onto them in 3d letters.

60mm = 56-60mm
62mm = 59-62mm
65mm = 62-65mm
68mm = 64-70mm
70mm = 67-70mm

example lens-sizes for a few DSLR lenses:
Name ....................... lens gear size (filter size)

Panasonic 14-42 ............ 60mm
Canon FD 50mm f1.2 (nicht L) 62mm (52mm)
Canon FD 50mm f1.2L ........ 65mm (55mm)
Canon FD 35-70 f3.5-4.5 .... 62,5mm (52mm)
Sun FD 135mm f2.5 .......... 66,5mm (58mm)
Tamron FD 28mm f2.5 ........ 60mm (67mm)
Tamron SP 28-80mm f3.5-4.2 . 68mm (67mm)
Tamron SP 60-300mm f3.8-5.4 68mm (62mm)
RMC Tokina 70-210mm f3.5 ... 70mm (62mm)

Blog post:


(for the few people here without a 3d printer)

License is CC-BY-NC-SA
So you may make one yourself and improve the design but not sell the design or made parts and always give attribution.


Since we can print these parametric gears to fit, there is no need for break-away structures on the inside to adjust a one-size-fits+-3mm gear to a specific lens.

Sorry, there was not enough space on the surface to include a QR-code in the design. ;)

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Could you make a 77mm one? I cant download alibre on mac :(. Much appreciated if you can.

Cool thanks for sharing :-D

You're welcome.

With the original CAD-files it's a change of a single parameter to include a long arm on the bolt-side.

So you can use the gear standalone too with finer control then when touching the focus-ring directly.

These look great! The only problem is that I need one for a Nikon 28-70mm, and when I put the calipers on it, it looks to be 88mm wide, which is much larger than the largest one here. I'm not sure how to make one.

Get a 30 day version of Alibre Design, open the .AD_PRT file and change the parameters and label for an 88mm version.

It's all parametric and you learn a great deal that way.

I have never been an CAD user, usually only 3dsmax. I am unable to figure out how to configure this thing in Alibre. The first step in "Features" (Importierte STEP Datei), I have no clue how to edit, the next "Austragung" seems like a boolean operation for the opening... and everything else down the list is the rest of the parts. Where do I change the diameter?

The outer diameter sould be defined in the very first sketch that defines the basic shape all further sketces work on.
However as far as I remember I started with a dxf export of a rendeed gear of the right size as it's not possible to calculate involute gears with a dynamic number of teeth directly in Alibre Design. I'm not the only one greatly missing better support for directly constructing and manipulating parametric gears.

There's a separate "

 equation editor

" for variables/values/formulas

It used to be easier to reach in the old user interface, now it can be found with either CTRL+E or by opening one of the sketches, clicking one of the meassurements and then the "..." next to the number.
They have a very good manual and tutorial videos (and had an even better hardcover tutorial/reference book 2 major releases ago).

Oh, Windows only software? :( Any chance someone would be willing to make the file I need?

Would love to see someone do this in OpenSCAD or another piece of (more open) 3D software. I could really use some at other sizes.

I looked left and right and there is no open 3D software that is really good.

(OpenSCAD is an early alpha with lots of problems and a usability nightmare that does not interoperate with existing CAD-packages.)