The Cine-Mod is a modification process developed by Duclos Lenses that improves still photo lenses in several ways, making them more useable for motion picture applications. The Cine-Mod consist of three primary parts: A seamless 32-pitch (0.8 module) focus gear, an 80mm front ring with 77mm filter threads, and a de-clicked, damped aperture movement.



Cine-Mod: $250
Individual pricing:
80mm Front Cap - $25
80mm Front Ring - $75
Aperture De-clicking - $60
32-pitch Focus Gear  - $105
Cine-Mod + Mount
Conversion: $409
Individual pricing:
Leica R to Canon EF - $159
Leica R to Nikon F - $159
Nikon F to Canon EF - $159
Ask about other conversions


Zeiss Primes

The Zeiss ZF.2 primes are among the most suitable still photo lenses to be adapter for motion picture use with the Cine-Mod. Their fully manual design and high quality materials makes them ideal. Converting the ZF.2 primes from Nikon F to Canon EF allows the all manual operation of the ZF.2 lenses to be used on a wide range of cameras. The ZE version of these primes offers a factory standard Canon EF mount but lacks the manual aperture of the ZF.2 primes. This makes the ZE variants less desirable as the iris can only be operated with a Eos camera smart mount. One of the greatest benefits of the Zeiss ZF.2 and ZE primes is that they can be purchased brand new with factory warranty.

Leica Primes

Leica has several series of lenses, of which the R series is the most well suited for the Cine-Mod. With proper focus rotation and a very desirable "vintage" look, the Leica R series primes are a very popular choice for cinematography. These primes can accept the Cine-Mod very well including the Leitax Nikon F or Canon EF conversion. With dozens of focal lengths produced over a range of many years, the Leica R series lenses are among the most popular still lenses for motion picture work. Certain lenses cannot accept the 80mm front ring due to uncommon filter thread sizes such as Series VII, and VIII. Other focal lengths cannot be used on cameras with a reflex mirror such as the 5D due to interference with the rear element.

Contax Primes

The Zeiss Contax (C/Y) primes are a good blend of features including fully manual operation and "proper" focus rotation. Their optical design is very similar to that of the more modern ZF.2 primes in certain focal lengths, and inferior in others. As with any lens produced over a decade ago, caution should be taken when searching for pre-owned lenses - their condition should be carefully evaluated prior to purchase. The Contax/Yashica primes can accept a Leitax Canon EF mount adaptation similar to the Zeiss ZF.2 and Leica R primes, but require specific mounts for different focal lengths. These mounts can be purchased directly from

Nikon Primes

Nikon primes have an excellent heritage with options ranging all the way from the early 60's Nikkor-S lenses up to modern AF-S G primes. Somewhere right in the middle you'll find the Nikkor AI-s series with fully manual controls and very pleasing glass. The Nikon AI-s primes won't be as well corrected or controlled as the Leica R primes and will have a "backwards" focus rotation, but their build quality and character more than make up for what they lack. Almost all Nikon AI-S primes can accept the full Cine-Mod as well as a Leitax Canon EF conversion. There are some exceptions. The Pre AI Nikon primes have an unaccommodating mount hole pattern that cannot be converted to EF easily. Newer Nikon primes such as the AF-S G series lack a manual aperture ring.

Zoom Lenses

There are few zooms that work well for motion picture application and therefor few that will benefit from the Cine-Mod. Nikon's AF-S 17-35mm, 28-70mm, and 80-200mm work well, but not without their drawbacks. The problems with using still photo zooms for cinema work include consistency, accuracy, stability, and plenty of other zoom related occurrences. Most zoom lenses lack a manual aperture ring and may require additional support due to their heavier design. For zoom that do work well for cinema, a zoom gear can be installed similar to the focus gear. This can be helpful for remote operation or motor driven setups. There are very few Leica R zooms that work well with the Cine-Mod. Modern Canon EF and Nikon F lenses can greatly benefit from focus and zoom gears.

Everything Else

There are plenty of other options out there. Parts of the Cine-Mod can be applied to so many different lenses. A few tips to keep in mind: A gear can be affixed to just about any surface that doesn't have an obstruction; including scalloped, rubber, metal, or plastic rings. Different surface patters and materials work better than others. Access to the surface where the gear is to be installed must be the largest diameter from the front or the rear of the lens. If the diameter of the scale is smaller than the front and the rear, a gear cannot be installed. Lenses without an aperture ring cannot be de-clicked for obvious reasons. 80mm front rings are installed using existing filter threads. Uncommon threads cannot accept 80mm front rings. Contact Duclos Lenses today about your lenses.

With tens of thousands of perfectly good lenses manufactured since the birth of photography, the possibilities are near endless. Put your old lenses to use on a 5D. Snatch up some vintage glass to mount onto your C300. Give a brand new set of primes a whole new purpose on the ever growing list of professional motion picture cameras. At a mere fraction of the cost of most new cinema lenses, the Cine-Mod can help you achieve the results you need with the lenses you already have. 

Ready to Cine-Mod your lens? Send it in to Duclos Lenses for a formal quote or you can simply buy the modification and send your lens in using our Equipment Shipper.

"Buy Now" feature for Cine-Mod is currently under construction.
Contact Duclos Lenses today for additional details.


Duclos Lenses designs all of their products in-house. Manufacturing takes place either in-house, or in the hands of ourlocal, trusted specialists including a range of professionals in the field of opto-mechanical manufacturing and aerospace fabrication. None of our products are outsourced overseas. We proudly label our products Made in USA.



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Duclos Lenses sets itself apart from the competition by actually knowing and understanding the products that we sell. We genuinely want all of our customers to receive the absolute best products possible. It's because of this that we offer two years of free basic maintenance with every new lens purchased from Duclos Lenses. This includes exterior cleaning, glass decontamination, infinity focus and flange depth calibration, and diagnostic checkup, FREE, as often as you'd like, for two years.



Express shipping... for FREE! Yes, free. This product will ship out Express by FedEx with full insurance and tracking at no additional charge. Applies to all domestic orders.



Duclos Lenses is committed to providing the best possible products to our customers. Unlike the competition, our technicians have the knowledge and tools to check every single lens that we offer. This happens once when new products arrive from the manufacture and once again before they ship out. This ensures that our customers are only receiving the best of the best. Yet another reason Duclos Lenses is the premier destination for motion picture lenses.