The Skyllaney Opto-Mechanics MkII conversion of the classic CY 50mm f/1.4 Planar T* is now available.

We now accept pre-order requests for the Planar conversions.

Simply fill out our pre-order request form with your information and choices. After submitting a pre-order request you will be sent an invoice for 50% deposit for the conversion. This reserves your service slot, choice of imperial font colour and leatherette insert choice.

If you will be sending you Planar to us for conversion, your existing Planar must have no fungus, no oil on the aperture blades, and be in good, usable condition. If your lens arrives in less than optical condition, the conversion will incur additional costs or, in some cases, the order will have to be cancelled.


Commissioning of a Planar conversion to be created (we supply the lens) £999 plus shipping.
NOTE: At the moment, we don’t accept pre-orders for this type of conversion, due to lens supply issues. However, please feel free to contact us by clicking the button below if you would like us to place you on a waiting list for a Planar conversion where we supply the lens:

Sending in your existing (working condition) Planar for conversion £699 plus shipping.
Once you complete a pre-order request, we’ll contact you within 24 hrs with shipping information and additional details.

Replacing rubber grip with leatherette – £50 extra.

*Please note: We convert used Zeiss 50mm f/1.4 T* Planar lenses for CY mount. The availability of these lenses in various conditions is always a factor. We only sell converted Planars that have excellent to mint condition glass. Any Planars that have fungus, haze, oil on the aperture blades or scratches, are not fit for conversion. However, there may be small cosmetic blemishes on the front exterior body, as these lenses are over 30+ years old. In most cases, we refuse to sell converted lenses that have unsightly aesthetic parts on any of our custom offerings. However, they may have small nicks in the anodising, minor dust inclusion, or other minor cosmetic marks, simply due to the fact it is no longer possible to procure them new.

Available leatherette colours:

Pre-order request:

Sample images:

Images below are out of camera jpegs using a Leica M240 digital camera.

Hamish at has done a write up about one of our rehoused Zeiss Jena 50mm f/2 Sonnar lenses. The article can be found here:

Recently, Skyllaney Opto-Mechanics spoke with Hamish of about our upcomming 5cm F/2 Bertele lens. The full interview can be found here:

Dr. Ludwing Bertele (1900-1985)
Optical designer of the original Sonnar lenses

Introducing the Skyllaney: 50mm f/2 ‘Bertele’.
Skyllaney Opto-Mechanics is hard at work developing thier new 50mm f/2 Bertele lens. By 2021, we hope to release our first limited edition run of a 50mm f/2 classic Sonnar formula lens in native M bayonet, which optically is based very closely off the1937 pre-war era design by Dr Ludwig Bertele.
Our version contains the same element radii that were established by the good Doctor in 1937, but marries them with modern AR coatings which have increased contrast and reduced flaring. We also are implementing a 9 bladed 1937 sytle rounded aperture for enhanced bokeh, a high precision brass helicoid, 90-100 degree focus swing from 0.7m to infinity, a high-speed focusing body utilising a finger tab, all kept in a compact body no larger than the v4 cron. It will be initially offered in black anodised (6061 Aluminium) or chrome (Brass) finishes, with an initial run of 150 lenses, with possibly another 100 to follow. Each one will have the front filter ring customisable by the customer with up to 18 characters, in addiiton to ‘ Bertele 50mm f/2’ and the lenses limited run serial number.

Here, at Skyllaney Opto-Mechanics, we have an affection towards Sonnar formula lenses, and we see the desire of our clients to experience these wonderful lenses for themselves. Because of that, we work on entirely restoring classic Contax I and Jupiter 8 lenses.

We have spent many months designing, developing, assembling and testing our custom-built, high precision dual 4 axis CNC machine. The machine has its four main axes (X, Y, Z, A) computer-controlled through CAM control software. It uses anti-backlash lead screws and ball screws, high precision/high torque stepper motors and high voltage drivers. The machine was extensively trammed and tested, the custom backlash systems further tweaked, and then certified using precision dial test indicators. We periodically re-tram it to ensure its continued accuracy.