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เลนส์ชุดถัดมาเป็นเลนส์ medium format ของ แป้น นั่นคือ pentax 6x7 67
มาอ่านประวัติคร่าวๆกันก่อน
Pentax 6x7 Lens Information Guide
In 1969, Pentax introduced the 35, 55, 75, 105, 150, 200, 300, 400, 600, 800 lenses labeled "Super Takumars." 1971 saw improved lens coatings and a name change to "Super-Multi-Coated Takumars." The 90 LS, 135, 500 and 1000 lenses were also added to the lineup at this time. The early 80's saw the introduction of the 45, 75 Shift, 120, 165, 400ED, and 800 ED lenses. The 55 and 90 lenses had optical updates during this time. These lenses had rubberized focus rings and were now labeled "SMC Pentax 6X7." The late 80's was the last major update with minor cosmetic changes ( all lenses now have rubberized focus and aperture rings ) and a name change to "SMC Pentax 67." In the late 90's and 2001, Pentax added a few more lenses to the line including the 75 2.8AL, 55-100, 90-180, and 300ED.
ขอเริ่มจากเลนส์กลุ่ม wide-angle primes ได้แก่ SMC PENTAX 67 55mm f4
SMC Pentax 67 55mm F4
Sharpness
10.0
Aberrations
10.0
Bokeh
9.0
Handling
10.0
Value
10.0
Description:
Wide angle lens for the Pentax 6x7 system, 65 degrees field of view horizontally, like a 28 mm lens on a 24x36mm camera. This lens represents the third and most successful optical formula for a Pentax 6x7 55mm lens.
Pros: Common 77mm filter size, sharpness and fidelity.
Cons: Weight! But nothing Pentax SMC is "lightweight"...
Sharpness: 10 Aberrations: 10 Bokeh: 9 Handling: 10 Value: 10 Camera Used: Pentax 67
What? The sharpness scale only goes up to 10? Add one more tick.
Bought mint with 67 body, this was the first of the big and chunky lens I had to come to grips with, literally, as a person with smallish hands. The focus barrel is big and rather slow to use compared to other Pentax SMC lenses I have, but where this lens excels is in the imaging department: corner to corner sharpness, especially from f5.6 onward (I can say confidently that it will deliver at f4, too!), is superb. There is no significant abberation or distortion that I can see. It is very exciting to view the sharp resolution in trannies on the lightbox, but the optical performance is most impressive with finer-grained films like T-Max 100/ACROS 100 where the effect is quite surreal. As with all my work, a tripod is used to maximise the benefits of this (and 165LS and 45mm) lens, and it is my kit's "standard" go-to lens.
An overall snappy piece of engineering and very highly recommended as an acknowledged stand out performer.
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