Tamron 70-150mm f2.8 soft 唯一保值的騰龍鏡 | Chan'Blog 遊攝天下解讀博文

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Tamron 70-150mm f2.8 soft 唯一保值的騰龍鏡

2021年01月01日 ⁄ Nikon Z6, Tamron 70-150mm f2.8 soft Adaptall ⁄ 共 4425字 ⁄ 暂无评论 ⁄ 被围观 4,268 views+

Tamron adaptall 系列十分經典，而這支tamron 70-150mm f2.8 soft 是屬於tamron adaptall 的sp系列，也就是勁一點的定位鏡頭，統稱Adaptall-2，但再高級的tamron鏡基本上都不保值，現在都是幾百元就可以把玩，但這支tamron 70-150mm f2.8 soft 就逆天改命，成為老騰龍之中，唯一保值的鏡頭，當然是說價格，如果計算通漲，也是輸的，不過，能保得值當年的價格，就已經驚天地泣鬼神。雖知連zeiss contax都跌到令人髮指的地步。

就玩家角度而言，此鏡有趣的地方有幾點，一，是一支70mm-150mm的變焦鏡頭，而且有f2.8光圈。二，有多重的soft變焦功能，此功能用來拍人像，有妙不可言的功效。再加上騰龍鏡當年認真的造工，真的算得上是人像外拍，居家自拍，必備銘鏡。

show一下其光學設計，嗯，很多片膠合，也很容易發霉。這支鏡由1979年出到1983年就停產了，在tamron sp系列中，算是最值得擁有的變焦鏡之一。tamron sp系列的定焦基本上能收的都收了，長焦太強，土地問題，也就沒入手。鏡有了，就是沒多少機會試，17mm f3.5，90mm f2.5，180mm f2.5都是好東西。tamron sp 的300mm f2.8還出過三代，都是好鏡，不過300mm 還要手動，今時今曰，只有高手可用。

有幸跟嫣裳八奇之一的老五，去拍和式浴衣，又是試鏡的好機會，人像攝影，當然要試一下這支tamron 70-150mm，有光的時間，眼前一亮，散景感覺也十分特别。當然比之老五的大作相去甚遠，但試鏡相，不要要求太多。

八奇老五，水上攝影無敵的IG在此: https://www.instagram.com/ansonclm/ 感謝大師carry。

回說tamron sp系列，另外的一支反射鏡，tamron 350mm f5.6也叫好叫座，當年沒人欣賞，很便宜，現在因為可以裝上中片幅數碼機用，又炒貴了，還一度見過有人喪心病狂，賣九千元.....

來看一下，鬼佬們是怎吹奏這一支tamron 70-150mm f2.8 soft。

「Tamron SP 70-150mm F/2.8 Model 51A: Tamron's fast 70-150 F/2.8 constant aperture zoom lens was specifically designed for portrait photography, and was the first compact telephoto zoom lens ever produced by any manufacturer which featured a built-in softness control. This lens is extremely sharp at all focal lengths when not using the softness control since a total of six lens elements are used in the variator and compensator groups to reduce zoom dependent aberrations to their absolute minimum. Although the optical performance is somewhat optimized for 105mm (the ideal portrait focal length), this lens's optical performance nevertheless is very good throughout the entire zoom range.
How does the softness control work? Simply press the SOFT ring button and then dial in any amount of softness adjustment from zero to three. The SOFT ring works by shifting the rear-most elements of the master lens group (the three lenses to the right of the aperture tick marks in the optical above diagram) to introduce spherical aberration plus small amounts of off-axis coma and off-axis astigmatism. Some may be wondering, "How accurate is the zero click stop position of the SOFT ring in order to prevent extremely slight softness from being introduced even though the SOFT ring is set to the zero position?" The answer is that Tamron machined the cam for the the three rear floating elements to produce zero softness effect until you turn the SOFT ring to approximately 1/4 of the way between the 0 to 1 marks on the SOFT ring. Our notes about using the SOFT ring (these notes were never described by Tamron in the lens's accompanying instruction manual):

You have two choices when using the SOFT ring...
The first choice is NOT to adjust the focus after adjusting the SOFT ring. This results rapid softening toward the edges of the film plane. This is suitable in portraiture photography where the head and torso occupy approximately the central 1/3 of the image frame, yet you want the surrounding areas (towards the edges of the film plane) slightly to moderately blurred depending on the SOFT setting. The second choice is to adjust the focus after turning the SOFT ring. This results in a gentler and much more even softening across the entire film plane.
The second choice results in mostly a pure spherical aberration softness effect being introduced across the entire film plane. The amount of softening across the entire film plane, of course, is dependent on the SOFT setting after you have refocused. This procedure is suitable for tightly cropped head and partial torso portrait photography where your subject occupies most of the film plane, and where you wish to soften the extremely fine details across the entire film plane.

Note that, when using the softness ring, you should remember to always manually stop down this lens and then look through your camera's viewfinder to verify the overall softness effect for the selected F/stop on the aperture ring. An even better method is to shoot several test shots of a subject at the SOFT 0, 1, 2 and 3 settings and at F/2.8, F/5.6 and F/8, and with no refocusing or after refocusing. Make careful notes, get the resulting prints (4"x6" is good enough) and label them. Break up the prints into two groups — one group without refocusing, and the other group after refocusing. Then you have a nice set of labeled "index card" prints which will show you what to expect. Once you have your "index card" prints and have learned what to expect from this lens, you will be amazed with your results.」

可見，這支鏡是多麼好玩，多麽值得你把玩。BTW，此鏡是可以放上gfx 50r 中片幅機玩的，不過今次我用了nikon z6，下回再上gfx，拍拍人像補數。