Jazzi - Sure, if you Google-etc "58mm 2.2x Opteka teleconverter" - it should come up. Here's an Oz and an Amazon link:
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http://www.ryda.com.au/Opteka-58mm-2-2X ... t22x58.htm-
http://www.amazon.com/Opteka-Telephoto- ... B000TH3DTYRe M42 - these days, all DSLR makers try to keep their lens mounts - the mechanical connection, usually with electronic contacts, that fastens lenses to their brands of cameras - unique. That is - your shiny new $1,700.00 Canon "L" lens only fits your Canon DSLR bodies. If you also have a Nikon (etc) - Nikon certainly makes lenses "just as nice" - but you'll have to pay a similar amount to get a similar-functions lens that fits your Nikon.
That ensures that Mitsubishi-Nikon-Corp, Canon-Corp, and the others, all make profits from selling a whole range of lenses for their cameras - rather than a "one range fits all" model. Other 'third party' makers like Sigma and others also make their own models of lenses - but most they produce with different mounts - Canon, Nikon, Pentax, so on. So buyers - particularly of second-hand - need to be careful that their nice bargain 70-300mm DG APO Sigma "is" actually "Canon mount", if the body they have is a Canon.
Back in the 1950s-'60s-'70s - makers' "business models" were different, and some, not all, sort-of co-operated with a "universal" mount for Film-SLRs - M42 screw-mount. Some of these lenses were rather "so-so" - and some were quite excellent. Takumar (Asahi-Pentax) - made many good / consumer-level, and excellent / pro-level lenses in M42. In those days, Asahi was competing with Zeiss, to make the best lenses in the world - and the 'pro' ones, back then, were very expensive - like buying "Canon L glass", now.
But those are still around - they're all-metal, and built to last - and last.... Many of them are quite affordable - a Tak M42 SMC 300mm f/4 prime for $180.00 in 'Very Good' condition - a bit over $200.00 for 'Excellent' - is quite a nice lens, and very good optically. With an adaptor (about $30.00) - those will fit any Pentax DSLR - and I think, some Canon, though users need to be very careful that the lens base safely clears the mirror, I've read.
Obviously, on a modern DSLR, these lenses - and there are hundreds of versions of them - from the very good optically, Tak SMC 55mm f/1.8 sitting on my bench here - out to 400mm - are "full manual" and need a bit of 'technique' to use. However for folk on a strict budget (I'm on disability pension) - they make the difference between having some really good optics lenses - and not.
Some of these Takumar lenses also come in a K-mount version - from 1976 on. That's the same 'fitting' that my new K30 uses - so don't need the adapter. But you'll pay a lot more for the 'identical optics' in K-mount! Example - Tak SMC Version-2, 200mm f/2.5 prime (both have the 6 elements in 6 groups build) - in M42 - is a bit under $200.00 for "Very Good" - and can be nearly twice that in K-mount!
There's also an f/3.5 version of the 200mm in both mounts, for rather lower cost - still quite a nice lens and very usable.
There's a pretty good Wiki article on M42 - it's a fascinating subject:
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https://en.wikipedia.org/wiki/M42_lens_mountAs for the Russian 58mm lens - that sounds more like its Filter size than its mount - and it's the mount - the "connector" - you have to consider. But it is likely far too heavy for this purpose.
Re the 'AF focus first' - it isn't necessary with the HS10 - it just saves a lot of winding the focus ring before it reaches the adjustment range. AF to beep - select MF on the left side button - and the ring will be quite close to the adjustment range. Not surprising - as the HS10 MF isn't a mechanical 'manual', as in a DSLR lens - it's still electronic, just adjusted manually. Though in this example, does work much better than MF in a lot of P&S cameras.
Regards, Dave.
