[LRflex] Converters

David, Ted, et al
Yes, if the converter is designed to work with a wide angle lens, then it's fine; most aren't though, and my answer was based on the original question being about the Tamron converters, of which I own two. Indeed, the Tamron converter won't even fit to the 24 mm Tamron! Most third party converters aren't very good, so far as I'm aware, and I can only speak with confidence about the ones that I own. I also have a two-part TelePlus converter (2x and 3x in one modular unit). Now that one I do NOT recommend! As a 2x, it costs 2 stops, and about 3.5 stops as a 3x; the definition isn't bad, but you lose so much sensitivity that it's hopeless with a long lens. Trying to photograph moving birds in bright sunshine using 200 ASA film, at about 1/30th and the lens wide open is a lost cause before you start..... :-( The first obstacle is trying to focus with a view looking like midnight, even with the bright viewfinder of my Pentax, and it only goes downhill from there. So - Tamron plus telephoto - fine! Other third-party converters - caveat emptor. 
Regards
Keith Longmore
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