RichC
Well-known
I've just bought a Soviet TK-2D teleconverter on Ebay for my Epson R-D1 because (a) I was intrigued and (b) it's more convenient to carry than a bulky long-telephoto lens that would only be used once in a blue moon.
Finding info on this teleconverter was difficult - most sources simply say "very rare". Anyway, before buying it I managed to discover a little about it, and after the effort I expended, I thought I may as well post my findings here in case anyone else is interested!
This is what I found on the web:
The first attachment shows the TK-2D. The second shows shots taken with (left) the TK-2D on my CV 75 mm lens (100% crop) and (right) the CV 75 mm lens only (resampled to 200% in Photoshop). Notes: the sun had gone in when I took the TK-2D shot, hence the colour difference; the lower contrast of the TK-2D shot is partly due to flare (compare the shadowed areas on the lower balcony).
If anyone else has used this teleconverter or has any thoughts on it, I'd be interested to hear them.
Finding info on this teleconverter was difficult - most sources simply say "very rare". Anyway, before buying it I managed to discover a little about it, and after the effort I expended, I thought I may as well post my findings here in case anyone else is interested!
This is what I found on the web:
- It was designed for FED cameras, and manufactured by "Zavod Tochnovo Preboroctpoeneya" ("Precise Instrument Works") in Kharkov, Ukraine.
- It is a x2 teleconverter, resulting in a 2-stop loss in light transmission.
- Its dimensions are approx. 38 x 49 mm (length x diameter), and the the mounts are LTM.
- The focusing is rangefinder coupled.
- There is an 8 x 19 mm (length x diameter) protrusion at the front, so only lenses with recessed rear elements can be used, i.e. telephoto and slow standard lenses. Lenses reported to work well with the TK-2D are Jupiter-9, Jupiter-11, Industar-61 and slow Leica Elmars.
- It works best with lenses that have reasonably broad focusing rings instead of pawls. Lenses with pawls and very thin focusing rings may not engage properly with the TK-2D's focusing mechanism.
- Marc Small (author of "Non-Leitz Leica Thread-mount Lenses") describes it as "superb", and says it "is much more finely made than the rather crude Komura and is a world ahead optically". (Komura made the only other Leica-mount teleconverter for rangefinders, occasionally found on Ebay selling for several hundred dollars.)
- It’s sharp and degrades the CV lens very little.
- Focusing is accurate, although tricky owing to the long focal length.
- Above a marked f/5.6 (= f/11), every shot shows veiling glare, which worsens drastically as the lens is stopped down (at f/22 it looks as if I'm shooting through loo roll!) - which seems counter-intuitive to me.
- Below a marked f/4 (= f/8) the flare disappears, and shots are sharp with good contrast.
- Situations that don’t affect my other lenses, e.g. the sun in front of the camera but high in the sky, also cause flare, at all apertures.
The first attachment shows the TK-2D. The second shows shots taken with (left) the TK-2D on my CV 75 mm lens (100% crop) and (right) the CV 75 mm lens only (resampled to 200% in Photoshop). Notes: the sun had gone in when I took the TK-2D shot, hence the colour difference; the lower contrast of the TK-2D shot is partly due to flare (compare the shadowed areas on the lower balcony).
If anyone else has used this teleconverter or has any thoughts on it, I'd be interested to hear them.
