Leica TelescopeOcular ToR
The Ocular ToR (Leica order no. 14234) is an adapter that makes it possible to use standard, telephoto, or zoomlenses as telescopes. It attaches to Leica Rlenses via the bayonet mount. The Ocular contains a SchmidtPechanprism that rotates the image by 180°, so that the latter appears upright and correctly sided, as well as an eyepiece with a focal length of 12.5mm. It has a 3 to +3 diopter adjustment. Focus is achieved via the focusing mechanism of the lens. The adapter is no longer in production, but can be found preowned in excellent condition for 300500 USD (check here for current offers on ebay).
The effective magnification achieved by attaching the Leica Ocular depends on the focal length of the lens. It is calculated as the ratio between the focal length of the lens and the focal length of the Ocular. For example, a 90mm lens would achieve a magnification of 7.2 (=90mm/12.5mm), and a 400mm lens a ratio of 32.
Ocular TOR Specifications
The body of the adapter is a solid, all metal construction with the eyepiece cover being of highquality rubber. It's core specifications are the following:
 optical construction with 3 elements;
 focal length of 12.5mm;
 eyepiece magnification of 20x;
 exit pupil diameter of 3.78mm;
 usable aperture of 1/3.3;
 field of view diameter of 12mm;
 weight of 100g (3.5 oz).
The Leica TelescopeOcular works rather well and can quickly turn a telephoto lens into a spotting scope. In good light, it can also be used in combination with Leica's 1.4x or 2x APOExtenders. With long focal lengths, it achieves magnification ratios that are generally beyond those of binoculars, but the setup tends to require a tripod for comfortable use due to the heavy weight of the lenses. Also, some photographers report that it takes some time to get used to the "tunnel perspective" that the Ocular ToR provides as a result of a field of view diameter that is smaller than the display in a camera viewfinder. It might, hence, be desirable and useful to try out the Ocular ToR, if possible, before buying it in order to avoid disappointment later on.
Overview of RSystem TelePhoto Lenses 


Telephoto primes  Leica Reference (#) 
Filter Type (size) 
Lens Dimensions (dia x len) 
Lens Weight (g) 
Production Period (years) 
Price 2009 (USD) 
Used Price (ebay) 

Leica MacroElmaritR 60mm f/2.8  11347  S7/E55  2.7 x 2.4 in  14.1 oz  19722009  3195  check  
Leitz ElcanR 75mm f/2  C341  E60  2.5 x 3.0 in  24.7 oz  19651965  $$$$  check  
Leica SummiluxR 80mm f/1.4  11349  E67  3.0 x 2.7 in  24.7 oz  19802009  4695  check  
Leica SummicronR 90mm f/2  11254  S7/E55  2.8 x 2.5 in  19.8 oz  19702000  3495  check  
Leica APOSummicronR 90mm f/2  11350  E60  2.8 x 2.3 in  18.3 oz  20022009  3895  check  
Leitz Wetzlar ElmaritR 90mm f/2.8 (I)  11229  S7  2.6 x 2.8 in  17.6 oz  19641983  $$  check  
Leica ElmaritR 90mm f/2.8 (II)  1154  E55  2.6 x 2.2 in  15.9 oz  19801998  $$  check  
Leica APOMacroElmaritR 100mm f/2.8  11352  E60  2.9 x 4.1 in  26.8 oz  19872009  3995  check  
Leitz Wetzlar MacroElmarR 100mm f/4  11232  E55  2.7 x 4.7 in  23.6 oz  19781995  $$$  check  
Leitz Canada ElmaritR 135mm f/2.8 (I)  11111  S7  2.6 x 3.6 in  23.1 oz  19641968  $$  check  
Leica ElmaritR 135mm f/2.8 (II)  11211  E55  2.6 x 3.7 in  25.8 oz  19681998  $$  check  
Leica APOSummicronR 180mm f/2  11354  E100  4.6 x 7.0 in  88.2 oz  19942009  8295  check  
Angenieux APO IF 180mm f/2.3  A180LR  E82  3.4 x 5.9 in  35.1 oz  19861992  $$$  check  
Leitz Wetzlar ElmaritR 180mm f/2.8 (I)  11919  S8  3.1 x 5.3 in  46.7 oz  19661979  $$$  check  
Leitz Wetzlar ElmaritR 180mm f/2.8 (II)  11923  E67  3.0 x 4.8 in  28.6 oz  19791998  $$$  check  
Leica APOElmaritR 180mm f/2.8 (I)  11273  S8  3.0 x 5.2 in  34.2 oz  19982004  $$$  check  
Leica APOElmaritR 180mm f/2.8 (II)  11357  E67  3.0 x 5.2 in  34.2 oz  20042009  5295  check  
Leitz ElcanR 180mm f/3.4  C303  E60  2.5 x 4.5 in  26.5 oz  19651965  $$$$  check  
Leitz Canada APOTelytR 180mm f/3.4  11242  S7.5/E60  2.7 x 5.3 in  26.5 oz  19751980  $$$  check  
Leitz Wetzlar ElmarR 180mm f/4  11924  E55  3.4 x 3.9 in  19.0 oz  19761996  $$  check  
Leitz Canada TelytR 250mm f/4 (I)  11920  S8/E55  2.6 x 3.9 in  48.7 oz  19701979  $$  check  
Leitz Canada TelytR 250mm f/4 (II)  11925  E67  3.0 x 7.7 in  43.4 oz  19801994  $$  check  
Supertele primes  Leica Reference (#)  Filter Type (size)  Lens Dimensions (dia x len)  Lens Weight (g)  Production Period (years)  Price 2009 (USD)  Used Price (ebay)  
Leica APOTelytR 280mm f/2.8  11245  E112  4.9 x 10.3 in  97.0 oz  19841992  $$$$  check  
Leica APOTelytR 280mm f/2.8 Module  11846  rear  4.9 x 10.9 in  131.9 oz  19962009  11290  check  
Leica APOTelytR 280mm f/4  11360  E77  3.5 x 8.2 in  66.1 oz  19962009  6995  check  
Leitz TelytR 350mm f/4.8  11915  E77  3.3 x 11.3 in  64.2 oz  19801993  $$$  check  
Leica APOTelytR 400mm f/2.8  11256  rear  4.9 x 12.4 in  220.1 oz  19921996  $$$$  check  
Leica APOTelytR 400mm f/2.8 Module  11847  rear  6.2 x 13.5 in  204.6 oz  19962009  17390  check  
Leica APOTelytR 400mm f/4 Module  11857  rear  6.2 x 15.0 in  136.2 oz  19962009  12490  check  
Leitz Wetzlar Telyt 400mm f/6.8  11960  S7  3.1 x 15.1 in  64.6 oz  19681994  $$$  check  
Leitz Wetzlar MRTelytR 500mm f/8  11243  E77  3.4 x 4.8 in  26.5 oz  19801996  $$  check  
Leica APOTelytR 560mm f/4 Module  11848  rear  6.2 x 15.0 in  224.3 oz  19962009  18590  check  
Leica APOTelytR 560mm f/5.6 Module  11858  rear  4.9 x 14.7 in  142.9 oz  19962009  14290  check  
Leica APOTelytR 800mm f/5.6 Module  11849  rear  6.2 x 17.4 in  231.0 oz  19962009  20390  check  
Leitz Wetzlar TelytS 800mm f/6.3  11921  builtin  6.0 x 31.1 in  242.0 oz  19721977  $$$  check  
Minolta RF RokkorX 800mm f/8 for Leica R  RF800LR  rear  5.0 x 7.0 in  69.1 oz  19731981  $$  check  
Tele zoom  Leica Reference (#)  Filter Type (size)  Lens Dimensions (dia x len)  Lens Weight (g)  Production Period (years)  Price 2009 (USD)  Used Price (ebay)  
Leica VarioAPOElmaritR 70180mm f/2.8  11279  E77  3.5 x 7.5 in  66.0 oz  19952009  8795  check  
Angenieux 3x70 70210mm f/3.5  A3X70LR  E62  3.1 x 6.5 in  27.6 oz  19851989  $$$  check  
Leica VarioElmarR 70210mm f/4  11246  E60  2.9 x 6.2 in  25.4 oz  19842000  $$$  check  
Leica VarioElmarR 75200mm f/4.5  11226  E55  2.8 x 6.2 in  25.6 oz  19781984  $$$  check  
Leica VarioElmarR 80200mm f/4  11281  E60  2.8 x 6.5 in  36.0 oz  19962009  2695  check  
Leitz Wetzlar VarioElmarR 80200mm f/4.5  11224  E55  2.8 x 6.2 in  25.0 oz  19741978  $$$  check  
Leitz Wetzlar VarioElmarR 105280mm f/4.2  11268  S8  3.5 x 9.4 in  68.8 oz  19962006  $$$$  check 
Further reading
The Leica Ocular works well with many of the Rseries lenses, including the APOTelyt telephoto optics. It can also be used in combination with Leica's teleconverters, if the light is good enough. Moreover, if you are more generally interested in the now discontinued Leica reflex system, you might want to check out the comparison of Leicaflex and Leica R cameras.
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