Funleader Converts Contax 45mm f/2 G-Mount Lenses to Leica M-Mount

Funleader, a lens manufacturer, has purchased 300 Contax 45mm F/2 lenses originally for Contax G–Mount and converted them to Leica M–Mount to make it possible to use the original Carl Zeiss Planar* optics with modern Leica rangefinders.

Contax Zeiss Planar 45mm f/2 G Autofocus Lens was originally designed for the Contax G1/G2 cameras. KEH has a few available for the original G mount. It is noted for its excellent color reproduction and for being one of the sharpest “normal” lenses at the time. It has six elements, in four groups, and Zeiss Planar T* multicoated Zeiss design. This was appreciated for its ability out-resolve nearly all grain from low ISO films.

Funleader is not the first to remount a Contax lens. Funleader claims it converted 170 Contax 35mm lenses in 2019, and, thanks to their success, decided to do it again with the 45mm F/2.

Funleader claims that the optical arrangement and all elements are original and unchanged, and that the desired image quality is still intact.

Here are some examples of photos taken using the converted lens.

Funleader only has a few lenses in stock, so they don’t know if there will be more. However, they have provided instructions for how to convert the lens at home if you already own it, don’t want a remounted version, or still love the idea of using it on an M-mount camera. These instructions include step-by-step photo and text directions to convert the lens safely. Funleader offers a $600 replacement helicoid for photographers who wish to perform the swap at their home. The detailed instructions can be found on the lens product page.

A 45mm f/2 G used lens can be purchased for as low as $536. However, eBay listings may sell for up to $900. Funleader’s $1,200 conversion from G-mount lens to M-mount is not a bad deal. This is especially true when the remounting process makes the classic lens compatible with modern digital rangefinders and allows for the possibility to convert to M-mount film cameras.

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