2026年7月11日 星期六

Tripod Socket Replacement of Hasselblad SWC (Older Version)

2026/7/11

In May of this year, I acquired a Hasselblad SWC (the original version, rather than the later SWC/M). The first thing I noticed when I received the camera was that its tripod socket was only about half its original length. 

After doing some research online, I learned the reason behind this modification. On the original SWC, the clearance between the tripod socket and the camera body is too small. When a CFV digital back is installed, the battery compartment of the digital back interferes with the rear half of the socket, preventing the CFV back from being mounted on the camera.

To solve this problem, it has become a fairly common modification to cut away the rear half of the socket, creating enough clearance for the CFV digital back. On my camera, the rear portion of the socket has been removed with a very clean, precise cut, suggesting that the modification was carried out by a professional.

今年5月,我入手了一台Hasselblad SWC(舊款,新款為 SWC/M)相機,收到相機的第一時間我就發現相機的腳架快拆板只有有原來長度的1/2。上網爬文查證的結果,原來是這款SWC的腳架快拆板與機身之間的空隙太小,當安裝CFV數位機背時,機背的電池會頂到腳架快拆板後半部,導致數位機背無法安裝於SWC機身。為了解決這個問題,將腳架快拆板切除後段1/2,算是蠻常見的做法。我手上這台相機,快拆板後端切除得很乾淨,應該是專業人士所為。



Since I don't have any plans to use a CFV digital back, I decided to restore the camera to its original configuration by replacing the modified half-length tripod socket with an original Hasselblad part. After searching through several online auction sites, I finally managed to find and purchase a brand-new original tripod socket on eBay.

因為我沒有使用數位機背的機會,打算找個原廠零件把這1/2個腳架快拆板換掉。經過幾番搜尋各大拍賣網站,終於從eBay購得全新的腳架快拆板零件。




The next step was to figure out how to replace the tripod socket. During my research, I found two documents that served as useful references:

接下來,就是開始研究如何更換新的腳架快拆板,我找到兩份文件可供參考:

Repair Manual for Hasselblad 500C, 500C/M and Super Wide C
https://phsc.ca/repair/Hasselblad/hasselblad_camera_500C.pdf

Service Manual Hasselblad SWC903
https://repaircameras.org/files/hasselblad/hasselblad-903swc-service-manual.pdf

On the later SWC/M, the tripod socket is externally mounted and slightly raised above the camera body. This design makes it much easier to accommodate a digital back, as the socket can be removed or replaced with a redesigned third-party quick-release plate if necessary. The earlier SWC, however, uses a much less accessible design. To replace the tripod socket, the camera body must first be opened. Then, three major components must be removed: the film advance lever, the circular shutter-cocking mechanism, and the lens assembly. Only after these parts have been taken out can you access the three screws inside the body that secure the tripod socket.

新款SWC的腳架快裝版都是外裝,而且有增高,所在使用數位背時,比較好因應,例如直接拆除或是更換成第三方重新設計過的腳架快裝板。這款較早期的SWC則必須先打開機身,然後取下快門桿、鏡頭快門上弦環形機構、鏡頭共三項重要零件後,才能從機身內鬆開用來鎖定腳架快裝板的3顆螺絲。






After installing the new tripod socket, simply reassemble the camera by reversing the disassembly steps. Reinstall the lens assembly, the circular shutter-cocking mechanism, and the film advance lever, and the replacement is complete.

更換好新的腳架快拆板後,反向操作,機身組合鏡頭、鏡頭快門上弦環形機構、快門桿,大功告成。


2026年7月5日 星期日

The Focusing Helicoid Disassembly of the Carl Zeiss Jena Flektogon 25mm f4 M42 Zebra Version

2026/7/5

One of the first issues I noticed after acquiring this lens was that the focusing ring was extremely stiff. At certain points, it required considerable force just to turn it. Considering that this is a 50-year-old lens, it's no surprise—the original helicoid grease inside the focusing mechanism has most likely dried out over the decades. Instead of providing smooth lubrication, it has become a source of resistance.

Following the previous article on rear-end disassembly, this installment covers the disassembly, cleaning, and re-lubrication of the focusing helicoid. The first step is to remove the entire optical assembly. Looking from the rear of the lens, once the aperture linkage, aperture ring, and related components have been removed, the retaining ring that secures the front optical assembly can be unscrewed. The complete optical unit—including the front lens group, aperture assembly, and rear lens group—can then be lifted out from the front of the lens, leaving only the focusing helicoid behind.

這顆鏡頭入手之後,令人困擾的問題之一是對焦環很緊,有些位置甚至需要非常用力才能轉過去,畢竟是50年的老鏡頭了,鏡筒內的潤滑油應該都乾掉了,原本潤滑的功能變成阻力。

接續上篇拆開後鏡筒之後,這次就來拆開對焦筒、清潔、重新潤滑。首先,要把整個鏡組取出,從後鏡筒觀察,光圈開閉連桿、光圈環等相關的零件拆除後,再將鏡頭前面的鏡組固定環卸下,即可將整個鏡組、光圈筒和後鏡組從前方取出,剩下的就是對焦筒了。






The retaining ring that secures the front optical assembly is the first ring adjacent to the lens barrel.
緊鄰鏡筒內的第一圈壓環就是用來固定整個鏡組


The focusing helicoid consists of three main components:
(A) The outer barrel, which supports the optical assembly and the aperture housing.
(B) The focusing ring, engraved with the focusing distance scale.
(C) The depth-of-field scale ring.

On the underside of Ring C, there are two metal tabs positioned 180 degrees apart. These tabs couple Ring C to Component A, and each tab is secured by two screws. After removing the four screws and lifting off the two metal tabs, Component A can be separated from the combined B + C assembly.

對焦筒由三個零件組成 (A) 固定鏡組和光圈筒的外筒 (B) 有對焦距離刻度的對焦環 (C) 有光圈景深刻度的環。C環的底部相對180度位置有兩個與A環連動的鐵片,每個鐵片有兩個螺絲固定,將這兩個鐵片卸下,即可將這A環和B+C環分解。






Inside Ring B, you will find a set screw that secures the infinity focus position. After removing this screw, Ring B can be separated from Ring C. I first used WD-40 to dissolve and remove the hardened grease from the helicoid threads. Afterward, I cleaned away any remaining WD-40 with isopropyl alcohol. Once the threads were completely clean, I applied a thin, even layer of medium-damping helicoid grease before reassembling the three rings by reversing the disassembly steps. The focusing ring now turns exceptionally smoothly.

B環內部可以看到一顆無限遠刻度的固定螺絲,將這顆螺絲旋下,便可將B環和C環分解。我先使用WD-40清洗螺紋上已經乾掉的油脂,再用酒精將WD-40清除,最後在螺紋上一層中度組尼潤滑油,之後反向操作上述步驟便可將這三個環再組合起來,轉起來非常順手。









When threading Component A back into the combined B + C assembly, it is important to engage the helicoid at the correct starting position. After the two metal coupling tabs have been reinstalled, Component A should be able to travel all the way to the bottom of the B + C assembly, which corresponds to the infinity focus position. Finally, reinstall the optical assembly, the rear aperture control mechanism, the M42 mount, and the remaining components. With that, the restoration is complete.

當A環要重新旋入B+C環,須注意螺紋旋入的位置,當上述兩個鐵片固定後,A環需能夠到達B+C環的底部(也就是無窮遠的位置)。最後裝回鏡筒,以及後端的光圈控制機構相關零件、M42接環等,就大功告成了。