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SMC Pentax-M 50mm f:1.4

I spoke last week of targets purchased and resold; it, I do not separate. That is what I best, simply.

• Type: Fixed focal lens manual
• Manufacturer: Pentax
• Model: SMC Pentax-M 50mm f: 1.4
• Purchase Date: September 5, 2007
• Filter Holder: 49mm
• Aperture: f/1.4 to 22, eight blades
• Focus: 45cm to infinity

All accounts, facts, set goals Pentax-M is my favorite . These goals are fully manual (no auto-focus, or control of the diaphragm by the case) very robust and compact - which distinguish them from the previous series (called "Pentax-K, first set of objectives Pentax bayonet), it is precisely their size and low weight to equal optical quality. As a result, much of these goals (28 to 135mm included) have the same diameter filter holder at the front of the lens, 49mm, which is my time convenient.

When you give the reference of any goals, we give two parameters: the focal logueur, which, depending on the size of the sensor (or film component), gives the magnification, and the maximum aperture of the objective, which indicates the maximum amount of light that can capture, aperture wide open. A very large maximum aperture assumes a superior optical quality - after all, with an aperture of pinhole can take good pictures without the use of objectives at all. In short, more objective can open big, it's best - and most expensive, of course.

The amount of light reaching the sensor depends on openness, it also depends on the focal length. To allow comparisons between the values of an optical diaphragm to the other, it expresses these values not in cm or 2 cm but a fraction of the focal length f / 4, f/16, f/5.6 ... In this way, the amount of light reaching the sensor with a diaphragm (say, f: 5.6) is the same regardless of the type of lens used, wide angle or telephoto lens. And exposure time that will result will also be the same. Corollary: As these are fractions, more openness, the greater the value is small. a lens at maximum aperture of f: 2.8 therefore gives a more objective f: 3.5.

Hence the interest of the Pentax f: 1.4: it allows to take pictures even in low light . And, like who can do more can do less, he, at smaller apertures, a fine image much larger than his little friends who are there at the end of the race. Bre: the ideal goal, or not far away.

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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!

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Tamron Adaptall 2 135mm f:2;8

Sold with Pentax ME Super well Tamron Adaptall the 28mm f: 2, 8 and Riconar 55mm 1:2.2 a Tamron telephoto lens with a very good bill ...

Tamron Adaptall 2 135mm f: 2.8, seen alone, with the 28mm Adaptall ring and with his and visor deployed.

• Type: Fixed focal lens manual
• Manufacturer: Tamron
• Model: Tamron 28mm 1:2.8
• Purchase Date: August 3, 2007
• Auction date: November 9, 2007
• filter holder:
• 55mm Aperture: f/2.8 to 22, six blades
• Focus: 1.5m to infinity

Of the three, is by far the greatest one I used - it was the trip to Denmark , unlike the case Pentax ME Super that I had not tested enough to take him away. He had me there, mounted on the P30T , photos of which I am very happy - as indeed in Paris, with the ME Super . Its large aperture (evident on the front view) can make things very satisfactory, that we want travaiuller by small light or just play with depth of field.

The 135mm is not a super-telephoto: not just want to make a tit at the other end of a field or a starlet in her pool. Rather, the objective of the small detail that is being sought, the narrowing of the voluntary field of vision. A bit long for portrait or photo social cons by, where, if you want a TV, a 85mm or a 100mm rigor are more comfortable. But as you can not have everything, I find it a fixed lens particularly useful.

I sold this objective (as that the 28mm) when I acquired my Pentax lenses of focal length equivalent. But I admit it, I regret it a bit.

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Tamron Adaptall 2 28mm f: 2, 8

Included in the lot of Pentax ME Super : Tamron Adaptall two goals 2 and a Tamron Adaptall ring (short). I have little use the Tamron Adaptall 28mm f: 2.8, a little too big and too heavy for the limited use I make of these focal lengths, even when I used without problem time time. But I've since replaced by M Pentax lenses, better and lighter - the 35mm and 28 mm together must weigh less than the Tamron ...

• Type: Fixed focal lens manual
• Manufacturer: Tamron
• Model: Tamron 28mm 1:2.8
• Purchase Date: August 3, 2007
• Auction date: November 9, 2007
• Filter Holder: 52mm
• Aperture: f/2.8 to 16, five blades
• Focus: 40cm to infinity

That said, it is objectives particularly robust and optically well damn - Little deformation for a 28mm. A good way to extend its focal inexpensively available!