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If you can't find a gear for your lens, please take a moment to fill out a custom gear form. Custom gears are only available in the US and are $45.00. The extra $10.00 goes toward the additional postage and design work usually needed to perfect each gear.
To start building a custom gear, we need 2 measurements - the width and diameter of the focus ring. Outside diameter (OD) is optional. If no outside diameter is specified, it will be made 3-6mm "high" off your focus ring for a clean, low profile gear that slides easily into your current lens case or bag.
Measuring with Digital Calipers:
If you've got a set of digital calipers, those are the most accurate method of measuring. They are very precise and ensure that your gear will be very very close if not absolutely perfect on the first attempt.
Measuring with a paper strip:
We highly recommend you use a digital calipers to measure. However, if you don't have access to calipers, lenses can be measured using only a paper strip. There are a few things you should know before using a paper strip though - the measurement is usually not as accurate and the gear may or may not fit as perfectly. We'll still adjust the gear if needed.
Here's a link to a printable measuring strip (double check it prints to scale):
You can wrap this around your lens's focus ring and read it from the zero mark to find the circumference of the focus ring. You can also use this to find the width of the focus ring - the distance from front edge of focus ring to the back edge.
We'll include a set of fit rings (or "Test Rings") you can try on the focus ring in the event your gear doesn't fit properly. There will be 10-15 numbered fit rings with slightly different inside diameters, in the same size range as the measurement you provided. Try them on the focus ring of your lens until you find one that fits tightly enough to turn the focus ring without slipping. We can make very precise adjustments based on which # ring fits best. We will adjust it and mail it free of any additional charges. Sometimes a little fine-tuning is required for total perfection.
On this lens, fit ring #67 fits perfectly and turns the focus ring without slipping. It fits exactly how the gear should fit, so let us know which # ring works best and we'll mail the corrected gear to you.