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Leica 1.4x and 2x teleconverters

Leica produced two apochromatically corrected tele-converters for its R-series lenses, the APO-Extender-R 1.4x and the APO-Extender-R 2x. Like any tele-converter, they enlarge the central part of an image to increase the focal length of the primary lens, while reducing the intensity of light on the imaging receptor. The APO-Extender-R 1.4x increases the focal length by 40% and leads to a one-stop loss in lens speed (a lens set to f/2.8 will become a f/4), and the APO-Extender-R 2x doubles the focal length and results in two aperture stops in lens speed loss (a lens set to f/2.8 will become a f/5.6).

Tele-converters offer a convenient, light-weight, and low-cost means of extending telephoto reach. However, in addition to darkening the image in the viewfinder, which makes focusing more difficult, they reduce sharpness and contrast in the image and might introduce chromatic aberration and flare. The degradation of image quality will generally increase with the magnification of the tele-converter, such that a 2x converter will deteriorate the outcome more than a 1.4x one. The extent to which the degradation from tele-converter use is visible in final prints depends on the quality of both the tele-converter and the primary lens. Leica's APO-Extenders are highly corrected and - in combination with the excellent R-lenses - deliver very good imaging performance that does not show the marked decline in sharpness observable with tele-converters of some other brands. Yet, some quality loss is to be expected.

Both APO-Extenders maintain the fully automatic iris diaphragm of the lens with which they are coupled. Also, the closest focusing distance of the primary lens remains unchanged, so that the maximum magnification ratio of the lens is increased. Both tele-converters are highly corrected for aberrations and optimized to work with Leica's APO-lenses, notably its APO-Telyt line of long tele primes. Up until the end of the R-system in 2009, the APO-Extenders were sold with front and rear caps, as well as a soft leather case. The adjacent table summarizes the core specifications of the tele-converters. A non-APO version of the 2x converter that had been in Leica's product catalog since 1981 has the same optical formula and physical measures as the APO-Extender-R 2x, but the non-APO version was not corrected for chromatic aberrations to the same extent as the APO-Extender and is clearly inferior with respect to imaging quality, in particular in combination with lenses longer than 250mm.

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Specifications of Leica tele-converters
# APO-Extender
1.4x
APO-Extender
2x (ROM)
Extender
2x (non-APO)
1Order number112491126911236
2Production period1986-20091992-20091981-1988
3Aperture range2.8 - 222.8 - 222.8 - 22
4Magnification1.4x2x2x
5Elements/groups5/47/57/5
6Length36mm (1.4")35mm (1.4")35mm (1.4")
7Maximum diameter62mm (2.4")70mm (2.8")70mm (2.8")
8Weight220g (7.7oz)270g (9.5oz)270g (9.5oz)
9Leica price (€, 2008)1,6501,950-
10Ebay price (€)250-500400-80040-80
11Current ebay offerscheckcheckcheck

The 1,4x APO-Extender-R was originally intended for specific lenses within the R-system, notably the APO-Telyt 280mm f2.8 lens, and early version of the tele-converter bear a respective designation on the converter-body. It has a strongly protruding front element and can, thus, only be mounted on lenses whose rear elements are far enough recessed within the lens body. The APO-Extender 2x does not have a corresponding limitation in compatibility and can be physically mounted onto all of Leica's telephoto lenses. Yet, Leica states that the APO-Extender 2x is designed for lens units with a maximum aperture of 1:2 or smaller. Indeed, when used with a fast lens, such as the Leica Summilux-R 50 mm f/1.4, there is no increase in light compared to using a lens with a 1:2 aperture number. This means an exposure compensation of -1EV should be applied when shooting wide-open, or that the lens should be stopped down to at least f/2. The following table on lens compatibility draws on information from summilux.net.

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Lens compatibility
# Leica R-system lens APO-Extender
1.4x
APO-Extender
2x (ROM)
Extender
2x (non-APO)
150mm f/2-100mm f/4100mm f/4
260mm f/2.8-120mm f/5.6120mm f/5.6
390mm f/2-180mm f/4180mm f/4
490mm f/2 APO-180mm f/4 APO180mm f/4
590mm f/2.8-180mm f/5.6180mm f/5.6
6135mm f/2.8 APO-270mm f/5.6 APO270mm f/5.6
7180mm f/2 APO250mm f/2.8 APO360mm f/4 APO360mm f/4
8180mm f/2.8 APO250mm f/4 APO360mm f/5.6 APO360mm f/5.6
9180mm f/2.8250mm f/4360mm f/5.6360mm f/5.6
10180mm f/3.4 APO-360mm f/6.8 APO360mm f/6.8
11250mm f/4-500mm f/8500mm f/8
12280mm f/2.8 APO400mm f/4 APO560mm f/5.6 APO560mm f/5.6
13280mm f/4 APO400mm f/5.6 APO560mm f/8 APO560mm f/8
14350mm f/4.8-700mm f/9.6700mm f/9.6
15400mm f/2.8 APO560mm f/4 APO800mm f/5.6 APO800mm f/5.6
16400mm f/4 APO560mm f/5.6 APO800mm f/8 APO800mm f/8
17500mm f/8-1000mm f/161000mm f/16
18560mm f/4 APO800mm f/5.6 APO1100mm f/8 APO1100mm f/8
19560mm f/5.6 APO800mm f/8 APO1100mm f/11 APO1100mm f/11
20800mm f/5.6 APO1100mm f/8 APO1600mm f/11 APO1600mm f/11
21800mm f/6.31100mm f/8.81600mm f/12.61600mm f/12.6
2235-70mm f/3.5-70-140mm f/770-140mm f/7
2335-70mm f/4-70-140mm f/870-140mm f/8
2470-180mm f/2.8 APO-140-360mm f/5.6 APO140-360mm f/5.6
2580-200mm f/4-160-400mm f/8160-400mm f/8
26105-280mm f/4.2150-400mm f/5.9210-560mm f/8.4210-560mm f/8.4

In addition to lens compatibility, the Leica user also has to be aware of camera-compatibility, as the R-bayonet has undergone several changes over time. The APO-Extender-R 2x is available in both non-ROM (order no. 11262) and ROM (11269) versions, while only a non-ROM version of the 1.4x exists (perhaps because the ROM chip could not be fitted alongside the protruding elements of the converter). Moreover, there are some compatibility issues with Leicaflex cameras, which are detailed in the textbox below.

Leica APO-Extender FAQ

Can the APO-Extender-R 1.4x be used with the Leicaflex cameras?

Mounting the 1.4x Extender on a Leicaflex requires a slight modification of the flange. When the modified extender is on the Leicaflexes, the auto-diaphragm is functional, but metering is stop-down only, not at full aperture.

Can the APO-Extender-R 2x be used with Leicaflex cameras?

No, the ROM version will not fit, because the chip interferes with the Leicaflex mount. Moreover, the non-ROM 2x APO extender has an R-only flange and will not fit any of the Leicaflexes, as the rear of the extender gets into the way of a light baffle at the top of the Leicaflex and SL mirror box. However, the extender's mount can be modified to work on the SL2.

Does the non-APO Extender-R 2x for Leicaflex offer auto-diaphragm?

No, the Extender-R (Leica order number 11237) that is dedicated for use with Leicaflex cameras only offers stop-down metering.

What advantages does the ROM-version of the APO-Extender 2x offer?

The ROM chip on the tele-converter makes it possible to transmit certain lens-specific information to the Leica R8 or R9 cameras. However, the strip of electrical contacts on the Extender-R does not have any benefit if used with a non-ROM lens or with a camera other than the R8 or R9.

For which Leica lenses is the loss of image quality particularly noticeable when an Extender is attached?

Lenses that provide a low-contrast rendering wide open, such as the Summicron 90mm f/2, tend to show a strong degradation of image quality in combination with a tele-converter.

How many copies of the APO-Extenders were produced and sold?

Leica assigned about 3,250 serial numbers to the 1.4x and about 37,000 to the 2x [leica-wiki].

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Overview of R-System Tele-Photo Lenses
#  Lens
Designation
Focus
System
(type)
Lens
Construction
(elmts/groups)
Close
Focus
(m)
Filter
Type
(size)
Lens
Dimensions
(dia x len)
Lens
Weight
(net)
Used
Price
(USD)
Current
Offers
(USD)
1
 
Leica Macro-Elmarit-R 60mm f/2.8MF6 / 50.27S7/E5568 x 62 mm400 g400-800ebay.com
2
 
Leica Vario-APO-Elmarit-R 70-180mm f/2.8MF13 / 101.70E7789 x 190 mm1,870 g4000-8000ebay.com
3
 
Angenieux 3x70 70-210mm f/3.5MF13 / 90.90E6280 x 164 mm783 g600-1200ebay.com
4
 
Leica Vario-Elmar-R 70-210mm f/4MF12 / 91.10E6074 x 157 mm720 g300-900ebay.com
5
 
Leitz Elcan-R 75mm f/2MF.. / ..0.70E6064 x 77 mm700 g3000-6000ebay.com
6
 
Leica Vario-Elmar-R 75-200mm f/4.5MF15 / 111.20E5570 x 157 mm725 g200-400ebay.com
7
 
Leica Summilux-R 80mm f/1.4MF7 / 50.80E6775 x 69 mm700 g2500-4000ebay.com
8
 
Leica Vario-Elmar-R 80-200mm f/4MF12 / 81.10E6071 x 165 mm1,020 g800-1600ebay.com
9
 
Leitz Wetzlar Vario-Elmar-R 80-200mm f/4.5MF.. / ..1.80E5572 x 157 mm710 g400-800ebay.com
10
 
Leica Summicron-R 90mm f/2MF5 / 40.70S7/E5570 x 63 mm560 g1000-2000ebay.com
11
 
Leica APO-Summicron-R 90mm f/2MF5 / 50.70E6070 x 59 mm520 g3500-5000ebay.com
12
 
Leitz Wetzlar Elmarit-R 90mm f/2.8 (I)MF5 / 40.70S765 x 72 mm500 g400-800ebay.com
13
 
Leica Elmarit-R 90mm f/2.8 (II)MF4 / 40.70E5567 x 57 mm450 g500-1000ebay.com
14
 
Leica APO-Macro-Elmarit-R 100mm f/2.8MF8 / 60.45E6073 x 105 mm760 g1500-3000ebay.com
15
 
Leitz Wetzlar Macro-Elmar-R 100mm f/4MF4 / 31.10E5568 x 120 mm670 g400-800ebay.com
16
 
Leitz Wetzlar Vario-Elmar-R 105-280mm f/4.2MF13 / 101.70S889 x 238 mm1,950 g3000-4000ebay.com
17
 
Leitz Canada Elmarit-R 135mm f/2.8 (I)MF5 / 41.50S765 x 91 mm655 g500-800ebay.com
18
 
Leica Elmarit-R 135mm f/2.8 (II)MF5 / 41.50E5567 x 93 mm730 g500-1000ebay.com
19
 
Leica APO-Summicron-R 180mm f/2MF9 / 61.50E100116 x 179 mm2,500 g8000-12000ebay.com
20
 
Angenieux APO IF 180mm f/2.3MF8 / 61.70E8286 x 149 mm995 g2500-4000ebay.com
21
 
Leitz Wetzlar Elmarit-R 180mm f/2.8 (I)MF5 / 41.80S878 x 134 mm1,325 g300-600ebay.com
22
 
Leitz Wetzlar Elmarit-R 180mm f/2.8 (II)MF5 / 41.80E6775 x 121 mm810 g300-600ebay.com
23
 
Leica APO-Elmarit-R 180mm f/2.8 (I)MF7 / 51.50S876 x 132 mm970 g2500-7500ebay.com
24
 
Leica APO-Elmarit-R 180mm f/2.8 (II)MF7 / 51.50E6776 x 132 mm970 g3000-8000ebay.com
25
 
Leitz Elcan-R 180mm f/3.4MF7 / 42.50E6063 x 115 mm750 g$$$ebay.com
26
 
Leitz Canada APO-Telyt-R 180mm f/3.4MF7 / 42.50S7.5/E6068 x 135 mm750 g800-1200ebay.com
27
 
Leitz Wetzlar Elmar-R 180mm f/4MF5 / 41.80E5586 x 100 mm540 g200-400ebay.com
28
 
Leitz Canada Telyt-R 250mm f/4 (I)MF6 / 54.50S8/E5566 x 100 mm1,380 g300-600ebay.com
29
 
Leitz Canada Telyt-R 250mm f/4 (II)MF7 / 61.70E6775 x 195 mm1,230 g400-800ebay.com
30
 
Leica APO-Telyt-R 280mm f/2.8MF8 / 72.50E112125 x 261 mm2,750 g2000-4000ebay.com
31
 
Leica APO-Telyt-R 280mm f/2.8 ModuleMF8 / 72.00rear125 x 276 mm3,740 g8000-12000ebay.com
32
 
Leica APO-Telyt-R 280mm f/4MF7 / 61.70E7788 x 208 mm1,875 g3000-6000ebay.com
33
 
Leitz Telyt-R 350mm f/4.8MF7 / 53.00E7784 x 286 mm1,820 g500-1500ebay.com
34
 
Leica APO-Telyt-R 400mm f/2.8MF11 / 94.70rear125 x 314 mm6,240 g10000-15000ebay.com
35
 
Leica APO-Telyt-R 400mm f/2.8 ModuleMF10 / 83.70rear157 x 344 mm5,800 g10000-15000ebay.com
36
 
Leica APO-Telyt-R 400mm f/4 ModuleMF9 / 72.15rear157 x 382 mm3,860 g6000-12000ebay.com
37
 
Leitz Wetzlar Telyt 400mm f/6.8 MF2 / 13.60S778 x 384 mm1,830 g500-1000ebay.com
38
 
Leitz Wetzlar MR-Telyt-R 500mm f/8MF5 / 54.00E7787 x 121 mm750 g800-1200ebay.com
39
 
Leica APO-Telyt-R 560mm f/4 ModuleMF11 / 83.95rear157 x 382 mm6,360 g12000-18000ebay.com
40
 
Leica APO-Telyt-R 560mm f/5.6 ModuleMF9 / 72.15rear125 x 374 mm4,050 g10000-15000ebay.com
41
 
Leitz Wetzlar Telyt-R 560mm f/6.8MF2 / 16.40S798 x 530 mm2,330 g400-600ebay.com
42
 
Leica APO-Telyt-R 800mm f/5.6 ModuleMF11 / 83.90rear157 x 442 mm6,550 g15000-20000ebay.com
43
 
Leitz Wetzlar Telyt-S 800mm f/6.3MF3 / 112.50built-in152 x 790 mm6,860 g3000-7000ebay.com
44
 
Minolta RF Rokkor-X 800mm f/8 for Leica RMF.. / ..8.00rear127 x 178 mm1,960 g1000-2000ebay.com

Further Reading

The APO-Extenders are genuine complements for Leica's apochromatically corrected tele-lenses when used on Leica reflex cameras. Moreover, they can be combined with an R-lens and the Leica Ocular-R to form a telescope. In this case, they enhance the reach of the primary lens similar to their effect in photography.

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