Kenko 2x HBF Teleplus MC6 converter for Hasselblad mf.
First of all, I have to clear out what this test IS NOT. It is not a comparison of this 2x
converter with other converters. Rather, it is an evaluation of the results achieved under specific test conditions using various Zeiss and Schneider prime lenses / zooms stand-alone, or in combination with the 2x converter. My idea was to
find out if the use of a 2x converter would provide acceptable results, given that their reputation is typically not outstanding, especially with zoom lenses.
The test equipment
The following equipment was used for the test: Camera: Hasselblad 501 CM Lenses: Zeiss 80mm CF f/2.8; Zeiss 150mm CF f/4; Schneider 140-280mm f/5.6 2x converter: Kenko 2x HBF Teleplus MC6
Film: Kodak Extachrome Professional 64 Scanner: Minolta Dimage Scan Multi Pro
The Zeiss 150mm CF is a classical medium tele, relatively lightweight at 875 grams (1 lb 11 oz) and compact,
versatile and very good for portraits. My only real complaint about this lens is its 5-leaves diaphragm. Too little, IMO, especially if you consider that it is a Zeiss. The 140-280 Schneider zoom is an outstanding lens, one of the few zooms
available for MF. More than the weight (1850 grams), what makes it difficult to use it is its size. It is long and with a very wide front lens (it accepts 93mm filters!). On the other hand, its focal range is impressing.
The test has been made using a Manfrotto 190 tripod, and using mirror lock-up for all shots.
Schneider vs Zeiss at 150mm
The two images are very close. I am not able to judge the slight differences in luminosity and contrast, as they can be due to the scanning process. The 150mm is slightly sharper, as I would expect.
2x converter in action
At 280mm, the Schneider (stand-alone) is sharper. The 150CF+2x and Schneider+2x are slightly softer and very close to each other. The performance of the Schneider in combination with the 2x is quite acceptable.
Take it to the limit
Now this is the Schneider at 280mm in combination with the 2x converter, yelding a 560mm!! I compared it with the Schneider
stand-alone at 280mm and upsampled to reach the same magnification. The difference is impressive, and obviously in favour of the Schneider / Kenko combo. I am satisfied of the performance, and plan to use this combo in the future. Of course there are limitations, the main being that this combo becomes actually a f/11 lens. A robust tripod and mirror lock-up is absolutely necessary to use it.