自從去年（2010年）12月跟入手了Mamiya RB67 pro之後，（參考文章：Mamiya RB67 pro sd入手）我在今年二月份又進了一顆屬於較長焦的鏡頭和接寫環。不過，這個東西我一直沒有機會寫個心得，順便紀錄一下，以便日後可以查詢。
上：最上面的照片，從左到右：nikon ais 135mm f2.8 、mamiya 140mm f4.5、mamiya 250mm f4.5、nikon 50mm f1.4。這張照片就可以清楚的知道，大約同焦段的鏡頭，但是120和135的相機的大小、差異有多大了吧！...畢竟RB67的片匝有6*7cm比起135的還大多了！
下：首先下面這顆是當初我和RB67一起買來的！140mm f4.5，有macro的功能。這顆鏡頭目前仍然有在賣新品，只是價格不便宜而已！
原廠網址：
http://www.mamiya-usa.com/rb67-pro-sd-lenses-140mm-f4.5-macro.html
下：口徑一樣是77mm和nikon 目前的三大元是一樣的。
下：這是mamiya 250mm f4.5，這顆是沒有apo的，目前mamiya在仍然在賣的250鏡頭有二顆，一顆有apo，一顆沒有，二顆價格差異蠻大的！
原廠的網站：
http://www.mamiya-usa.com/rb67-pro-sd-lenses-250mm-f4.5.html
下：再近一點看，所有的標示都是用白字印上去的。
下：開光圈、快門的大眼睛，一樣是77mm的口徑。
下：再來一張照片。
下：再來一張140mm的照片。
下：這就是光圈、快門都做在鏡頭身上！靠近鏡尾的是光圈（就是現在打開的那一圈）。
下：再裡面一點的那一層是快門，這是快門、光圈半開的情況，
下：這是光圈全開，可以清楚的看到鏡間快門的模樣，這些鏡頭的最快快門只有1/400秒，不算快！也可以看到這些鏡片的顏色有著淡淡的藍色。而這些鏡頭使用上感覺這些鏡頭拍起來的照片蠻淡的。
下：這是二個接寫環，特別是適用於140mm micro。
下：拆開後的樣子。上面還是有舊式的mamiya sekio的標視。
最後，附上原廠網站上的數據：
The 250mm f/4.5 is an unusually compact long telephoto design, with five elements in four groups. It creates accentuated foreshortening and accentuated distance between foreground and background objects.
Applications include telephotography, landscape, wildlife, sports and fashion photography, where compression effect is desired.
Equivalent to 118mm in 35mm format.
| 250mm f/4.5 Specifications | |
| Optical Construction | 5 elements/4 groups |
| Angle of View | 20° |
| Diaphragm | Automatic |
| Minimum Aperture | 45 |
| Shutter | Seiko #1 mechanical lens shutter, 1~1/400 sec., T (time), X contact (flash synchronization at all speeds) |
| Equivalent Focal Length for 35mm | 118mm |
| Minimum Focusing Distance | 6’ 1.0" / 1,854mm |
| Magnification | 0.19x |
| Area Covered | 11.8 x 14.6" / 299 x 371mm |
| Filter Size | 77mm |
| Lens Hood | Screw-in |
| Dimensions (L x W) | 4.7 x 3.0" / 119 x 77.2mm |
| Weight | 2 lbs. 8 oz. / 1,130 g. |
The 140mm f/4.5 Macro features outstanding resolution at all distances and apertures, and adjustable flat field correction. The built-in floating element system allows correction of edge sharpness for copy work down to 1:1 life size with optional extension tubes.
The lens will focus from infinity to 1/3 life size magnification with the RB camera’s built-in bellows.
Applications include copywork, macro and close-up photography of all objects from product photography to flowers. Fashion and beauty photographers find the140mm f/4.5 Macro particularly useful for a variety of subject close-ups and normal shots. An extremely versatile lens, the 140mm f/4.5 Macro can also operate as an excellent normal focal length lens focusing to infinity for portraits, landscapes and general purpose photography.
Equivalent to 68mm in 35mm format.
| 140mm f/4.5 Macro | |
| Optical Construction | 6 elements/4 groups |
| Angle of View | 35° |
| Diaphragm | Automatic |
| Minimum Aperture | 32 |
| Shutter | Seiko #1 mechanical lens shutter, 1~1/400 sec., T (time), X contact (flash synchronization at all speeds) |
| Equivalent Focal Length for 35mm | 68mm |
| Minimum Focusing Distance | 759mm |
| Magnification | 0.33x |
| Area Covered | 6.8 x 8.4" / 173 x 214mm |
| Filter Size | 77mm |
| Lens Hood | Screw-in |
| Dimensions (L x W) | 3.5 x 3.8" / 90 x 97.2mm |
| Weight | 2 lbs. 7 oz. / 870 g. |
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