pikacat wrote:
M82是表示 82mm
請問那0.75是什麼意思？？
螺牙牙距 0.75 mm.
個人積分：46分
文章編號：57602690
個人積分：899分
文章編號：57603082
個人積分：155分
文章編號：57606663
nsx0831 wrote:
But there’s a bit of a catch: that’s for testing at middle distances (10 to 25 feet). But at infinity (where the MTF charts are made) it doesn’t seem quite as good (it’s still good, but not amazingly good), so there are probably better choices for landscape work. But 25mm isn’t really a landscape focal length for most people, it’s more for reportage, street shooting, architecture, and video work. For these purposes, at middle distances, I’m not sure there’s a better lens available.
這段描述並不是十分清楚，以我的使用經驗並沒感受到這問題，我沒有canon機身，因此都是轉接至a7r來拍攝，唯一問題就是轉到底並非無限遠，我不知道是鏡頭本身製作問題還是轉接環問題，因此拍線遠處我依然要放大後再仔細對焦．
Tessar；Xenar；Color Skopar
個人積分：1047分
文章編號：57667014
Loxia 21mm F2.8 rumor would you buy it?
Touit:
Sony claimed they will focus on FF bodies. Whatever that means for APS-C, it's not probable that market for A6000 and possible follower will significantly grow. Sony didn't announce new APS-C lens for a while either and other producers such as Fuji for which they made Touit too are somewhat unpredictable...
Milvus:
This line is a direct reaction to the new high resolution sensors - Canon 5Ds/R and upcoming Nikon models. With appropriate adapter, they can be used also on Sony E mount. Two lenses that weren't really up to the new sensors were completely redesigned. (50/1.4 and 85/1.4)
Loxia:
Market for M-mount lenses is getting smaller and smaller. Zeiss was trying to find another market space for those lenses and Sony FF E mount was a logical choice. They needed to make a rather simple optical correction in order to improve corner performance and they started with two most wanted FL - 35 and 50. Zeiss adimted that they weren't really sure about market success of Loxia but sales results so far are very promissing. This is why they will basically shift ZM line toward Loxia, adapting designs that are capable of simple corrections and creating completely new designs where needed.
Batis:
This line is basically evolution of the Touit. The market interest for Batis lenses put pressure on planned production volume and thus they have supply problems recently. There is no doubt that new Batis lenses will be introduced, but they have lot to do with logistic now, so I would expect new Batis announcements a bit later.
The thing is that recent photographic equipment is becoming more and more system specific and existance of advanced optical design softwares makes the development of lenses cheaper and faster.
Considering the cycles of body replacements and new sensor implementation, it is to be expected that more and more lens lines will be introduced... (We can see that new sensor in A7Rii which has significamtly thinner cover glass, already causes difference in MTF50 among native E mount lenses in comparison to older A7 models. Curved sensors could come too and they will have significant effect on the lens projection, software and processing power are another area where we can expect progressive influence on the optical design etc.)
粉:嗆準車主裝裝甲有人生意義,五代也生鏽是合理的事.
指出車廠缺失:反而是個性有問題,趕快賣車!
個人積分：1047分
文章編號：57667183
Zeiss Milvus Lenses – Hands On
As written above, 4 out of 6 new Milvus lenses – 21/2.8, 35/2, 50/2 Macro and 100/2 Macro, are optically same lenses as they were, but in the new coat (barrel) and featuring next generation of T* coatings.
...
No matter how hard I tried, I couldn’t get the answers who is actually producing new Zeiss lenses. For some reason, I am in doubt that those were produced in Cosina, at least not in the way, classic Zeisses were.
All I can hear is – “we are cooperating with large number of suppliers and partners from Asia”.
I also tried to find out if Batis is original Zeiss design, considering similarities with new Tamron 85/1.8 patent – http://www.sonyalpharumors.com/now-we-can-be-almost-sure-of-it-the-batis-85mm-has-been-designed-by-tamron/ but the official answer of product manager was… official – “We are not commenting on this, Zeiss is not willing to react on any rumors or speculations. Mr. Nasse told me that Batis is original Zeiss design and I decided to trust him. He also admitted that Zeiss is licensing AF and OSS from third-party supplier.
...
With the introduction of Milvus line, one thing is clear IMHO. Gin was released from the bottle. While 2 Otus lenses, Touit, Batis and Loxia lines were somehow considered as kind of experimental or specialized products, it is clear that they were successful experiments and Zeiss is moving toward innovation. BTW – ZM line is on hold for now, and as far as I have been told, no new lenses in this line are in perspective.
粉:嗆準車主裝裝甲有人生意義,五代也生鏽是合理的事.
指出車廠缺失:反而是個性有問題,趕快賣車!
個人積分：899分
文章編號：57687462
tessar wrote:
這段描述並不是十分清楚，以我的使用經驗並沒感受到這問題，我沒有canon機身，因此都是轉接至a7r來拍攝，唯一問題就是轉到底並非無限遠，我不知道是鏡頭本身製作問題還是轉接環問題，因此拍線遠處我依然要放大後再仔細對焦．
...(恕刪)
轉接環問題，我買過的轉接環除了kindai以外，其他牌子都有無限遠問題(無論價格)，這些廠商的車床精度都不足。
ZF25無限遠畫質問題我認為是個案，卻被放大了。以下是我的全開光圈測試，ZF25中央非常利，連最右邊的角落也相當不錯。
全景(另開分頁檢視可放大)
中央截圖(另開分頁檢視可放大)
右邊截圖(另開分頁檢視可放大)
RAW檔下載: 201510/mobile01-aede9d5d294635dfdd72044c64c99ca2.zip
