2010 Littlest Pet Shop Advent Calendar

Bague Tamron Adaptall

logical complement Tamron Adaptall 28 and 135mm : the adapter ring for my favorite mount, that is, of course, Pentax K mounts

• Type: ring lens adapter
• Manufacturer: Tamron
• Model: Tamron Adaptall Pentax K
• Purchase Date: August 3, 2007
• Auction date: November 9, 2007
• inner frame: Pentax K mount external
• : Tamron Adaptall

The thing is, since there are boxes on the market with interchangeable lenses, manufacturers have never been able to agree on the interface between body and lens: the frame. Regarding boxes 24 × 36, the only mount shared relatively among many manufacturers is the 42mm screw mount (M42), used by many manufacturers including German, then resumed by Pentax for its first cases (until Spotmatic) and Russian manufacturers, which produced essentially copies of German models .

The problem is that changing a lens with screws, it takes some time - not much, but still ... Hard to do with one hand anyway, even if I changed smoothly M42 goals while walking at a brisk pace through vacant lots in South Africa. Furthermore, when one wishes to connect the camera and lens, for example to indicate to the case that the diaphragm will use it without closing it before the picture is taken, it raises complex engineering problem.

All manufacturers have therefore produced their own beast. Pentax is the K bayonet, a system to lock rotation of 30 ° - a system in which the brand has remained true to this day, unlike its competitors who have striven to render obsolete their own goals Changing Frame (in midstream course). It has been enriched by new functionalities: adjust the diaphragm housing (KA) Autofocus (KAF) ... but still, a Pentax K lens in the early 70's still used on a K20D digital art.

However, the incompatibility between frames manufacturers (except that Ricoh has chosen the K-mount) problem for manufacturers of optical self as Tamron: it was not profitable to produce as many models as manufacturers, even if the optical part remained the same. The solution: produce lenses truncated, with a streamlined frame and offer a broadest range of adapters to be inserted between the lens and body. That's what you see here.

That said, this ring me two problems: first, I had only one to two objectives - the disassembly / assembly of the Adaptall ring is much more tedious than a lens change on the housing . And then it was a ring Adaptall short, so with K-mount, while a ring Adaptall 2 (KA mount) would have allowed me to use these objectives in program mode.

Anyway, I solved the problem: I sold ring and objectives, and bought the same optical Pentax lens!