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#19
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"Gisle Hannemyr" wrote in message
... I am getting one of these old M42 manual lenses for use on a slightly newer 1.3x crop DSLR via an adapter. The price for the Super Takumar is considerable higher than the price of the Pentacon - but neighter will break the bank - so the price doesn't matter. The Pentacon is mint, the Super Takumar shows some wear, but the glass is in good shape and the controls are smooth. The Pentacon is a pretty good lens, but The Pentax is one of the greatest 50mm lenses ever made. A slightly later Super-Multicoated-Takumar or, later still, SMC Takumar would probably be a better bet still, since Pentax's SMC coating is to this day one of the very best. (The original SMC is as good as modern Zeiss T* and Fujinon EBC, the current SMC I think edges even both these out.) However, the latest Super Takumars were multi-coated before the process was officially launched by Pentax, so take a close look and you _may_ find you get a bargain if the lens has multicoating but not the 'label' to say so. The Super Taks started off using Thorium in their glass formulation and some of the earlier ones have now yellowed due to compounds of the products of Thorium's radioactive decay. Not all samples seem to exhibit this effect, it should not be confused with the lens coating which can look yellow/brown from certain angles. Look through the lens at a piece of white paper to see if it has become too yellow - a little warmth you may or may not mind, but appreciable yellowing is a problem. It _may_ be possible to clear a yellowed lens with UV light, but people argue about this so I wouldn't buy a yellowed lens on the assumption it will definitely work. Which one is the best (resolution, contrast, colour)? I am aware that the Super Takumar is almost one stop faster, so I am leaning towards that one - but would like to hear from someone that has actually used either lens. The Pentax is quite good wide open - better than the Pentacon, but stopped down to around f5.6 is where it will really blow your socks off. I understand that the old lenses have some limitations compared to modern lenses - e.g. that there is no aperture coupling, and that they won't meter on a modern camera. But how do these 30 year old (?) lenses compare /optically/ to modern 50 mm lenses such as a Canon or Nikkor 50mm f/1.4? The Penatcon will probably not perform as well, though it won't be miles behind. The Pentax beats both these examples, though the Nikon may be a bit sharper wide open, if not when stopped down. Subjective impressions, these. Personally, however, I like Pentax's lens 'philosophy' better than Canon's or Nikon's anyway. Canon can look too 'smoothed out' to my eye - not enough micro contrast, perhaps - as if the whole world (not just people) were wearing a bit of foundation. Nikon is much more contrasty, and I like that for B&W, but less so for colour, and the Nikon's bokeh is not attractive. These are very subjective views and relate to what works best for my style and subject matter, so YMMV. Peter |
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