【HobbyShow】Vintage restoration

来源: 2021-02-19 21:07:41 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读: 次 (8733 bytes)
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My apology of the photographic terminologies, they are just out of scope. 

AGFA (abbreviation for Aktien-Gesellschaft für Anilin-Fabrikation) was a major producer of cameras, accessories, film and photographic chemicals, founded in Berlin, Germany in 1867.

A fews years ago, by chance, I received an AGFA Isolette I folding camera literally for free. The AGFA Isolette was the “bread and butter” camera for Agfa for the longest time.  AGFA Isolette I is the very basic model made in 1950's.  Already over half a century old, still in working condition, but problems can be aniticipated.

 

 Light leaking of the bellow, the folding part of the camera, is most common and the first thing I checked.  In my darkroom, my darkroom is my basement, it's only dark at night.  Open the back side of the camera,  turn on a flashlight in front of it, watch the interior side of the bellow from the open back, any light spot is a pin hole that could ruin the film.  A bellow normally is made of leather or other flexible light isolating material and can last quite long time, but over 60 years weathering they eventually got worn out.   Only way to fix is to change a new one. I just could not wait to give a try,  so I taped all the corners of the bellow and gave it a shot. This camera uses 120 format film which in today's digital camera time is referred to as medium framed, the sensor size of the medium frame digital camera is the same as one 120 film frame, i.e. roughly 60mm X 60mm. 

One  120 film roll of 6x6 format yields 12 frames in total.  Of the test roll, 11 out of the 12 pictures  completely out of focus, I realized the focusing mechanism is not working although the focus ring itself turning, but not driving the lens elements.     

The reason of the focusing problem is chemical reaction of the brass lens construction and aging lubricant used by AGFA causing lens elements seized off. I decided to fix all the problems at one time.  I made a double layered new bellow from some light proofing fiber material I happened had just enough for the work. I did not record the bellow making process.  The next would be taking the lens apart to fix the optical problem. The lens mount can be accessed from back side. 

     

The lens is a full assembly of optical elements, shutter, selftimer, aperture, and so on. Need to be further disassembled down to functional elements.

The multiple glass elements assembly, when they are turned against eachother, the distance between the glasses varied giving new focusing points. Now they seized. This part need most precaution, cannot force it, any tiniest deformation on the frame or crack on the glass, game will be over. I had tried several methods to free the lenses, starting from the mildest one by dipping the lens into 99% alcohol for a few days, not working. I didnot want try WD40, too oily, scared might ruin the optical coating. Eventually, the heatgun became the life saver, FYI, not a hair dryer simply the temperature too low.  I checked the glass safety temperature before using the heatgun, still I did not hold it steady on the lens since glass distortion would result in image distortion,  and at last the hardened lubricant gave in before the glass. I quickly took it apart and  put them into alcohol again. Cleaned thoroughly and smeared a tiny bit new grease on the thread and assembled again.              

lens assmebly showing aperture, shutter winding lever, and so on.   

Now lens is adjustable, bellow's been changed, time to put it together. Everythings is working now...

But that is not all..., the lenses are capable to focus from the nearest point to infinity, but how to tell the distance? There is a focus dial ring which is mounted on the very front of the lens with a set screw, no locator, so the lens need to be calibrated, e.g. when the lens focuses at 3 meter distance, the focus dial should point at 3 meter.    

No accurate lab equipments, DIY method can also make it just as good. The principle and steps as:

  • put a clear plastic card with an image on the film plane of the camera being calibrated, call it camera #1, set the aperture to the widest opening, shutter speed at 'B' position;
  • Used another, camera #2, heads on with camera #1, let camera #2 focus on infinity.
  • Turned the camera #1 lens, until the image(on the film plane of camera #1) on camera  #2 is in focus .
  • Now camera #1 is also focusing at infinity, put the focus dial ring back on camera #1, align the indicator arrow to the infinity position.

two cameras lens to lens head on.

I drew this cat on a clear plastic card, and stuck it on the agfa's back to replace a film.

   

Took a picture from the digital DSLR,  eyeballed the focus, this no range finder on AGFA Isolette I , need to  estimate the focus anyway, so this is good enough. 

finished,

A few photos taken with AGFA Isolette I, developed with D76, EPSON V550 scanner,

But since then it has been used more as a photographic prop than a tool and certainly a dust collector as well,  but every once in a while I would take it out and wipe the dust... ...,  

所有跟帖: 

你不但是古董收藏家,还是古董修理家!:) 两只相机连在一起?相片真是有旧相片的感觉啊。画的小猫 -beautifulwind- 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 beautifulwind 的个人群组 (208 bytes) () 02/19/2021 postreply 22:56:04

必须好好夸一句: 疼LP的人会发达!:) -beautifulwind- 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 beautifulwind 的个人群组 (58 bytes) () 02/19/2021 postreply 23:12:09

这从何说起? -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 02/20/2021 postreply 11:43:11

你啥都知道,这句话没听说过?去百度一下:) -beautifulwind- 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 beautifulwind 的个人群组 (0 bytes) () 02/20/2021 postreply 15:37:50

吕方《锡老婆会发达》。。。 -沿途美景- 给 沿途美景 发送悄悄话 沿途美景 的博客首页 沿途美景 的个人群组 (56 bytes) () 02/21/2021 postreply 08:19:08

是吧,你是显微镜用习惯了? -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (229 bytes) () 02/20/2021 postreply 11:36:23

我看显微镜超过一小时肯定头疼:)哇,这真是漂亮!颜色是后期调了吗? -beautifulwind- 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 beautifulwind 的个人群组 (269 bytes) () 02/20/2021 postreply 15:41:30

原色,绿蜂与红花搭配很鲜艳,今年夏天找机会拍昆虫微距,我对昆虫的复眼感兴趣,这有蒲公英。。。 -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (543 bytes) () 02/20/2021 postreply 16:30:59

这真是我喜欢的,小小的世界得到放大,那对beetles你怎么取到景的?:) -beautifulwind- 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 beautifulwind 的个人群组 (255 bytes) () 02/20/2021 postreply 17:40:36

它们就在路边而且不爱动,微距拍水珠就是拍水珠里的反光,加些白糖就好用 -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 02/20/2021 postreply 18:43:25

技术文,收藏学习!黑白照片很有味道啊。 -俏君- 给 俏君 发送悄悄话 俏君 的个人群组 (0 bytes) () 02/20/2021 postreply 00:03:46

哪里,我不论做什么都很匠气,缺少艺术家气质 -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 02/20/2021 postreply 11:44:42

照片有中国山水画的美感!花帅心灵手巧疼女人,赞! -忒忒绿- 给 忒忒绿 发送悄悄话 忒忒绿 的博客首页 忒忒绿 的个人群组 (0 bytes) () 02/20/2021 postreply 05:56:00

山水画需要这么多灰度吗? -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 02/20/2021 postreply 11:42:44

啥都好,就是把美女的脸部弄糊了。我读两遍想看花帅怎样疼LP, 没找到。 -天边一片白云- 给 天边一片白云 发送悄悄话 天边一片白云 的博客首页 天边一片白云 的个人群组 (0 bytes) () 02/20/2021 postreply 06:53:42

摄影师的女主角啊:) -beautifulwind- 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 beautifulwind 的个人群组 (0 bytes) () 02/20/2021 postreply 09:23:18

想多了,哈哈哈 -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 02/20/2021 postreply 11:43:54

用心的呵护! -danren- 给 danren 发送悄悄话 danren 的博客首页 danren 的个人群组 (0 bytes) () 02/20/2021 postreply 08:08:13

一语双关:) -beautifulwind- 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 beautifulwind 的个人群组 (0 bytes) () 02/20/2021 postreply 09:23:47

掸土也算吗? -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 02/20/2021 postreply 11:45:28

照片拍得真好! -Ha65494- 给 Ha65494 发送悄悄话 Ha65494 的博客首页 Ha65494 的个人群组 (0 bytes) () 02/20/2021 postreply 12:54:18

Wow, you know so much about cameras! thumbs up! -甜虫虫- 给 甜虫虫 发送悄悄话 甜虫虫 的博客首页 甜虫虫 的个人群组 (0 bytes) () 02/20/2021 postreply 20:41:20

看来花兄深谙happy wife, happy life 之道! -树的花花世界- 给 树的花花世界 发送悄悄话 树的花花世界 的博客首页 树的花花世界 的个人群组 (0 bytes) () 02/21/2021 postreply 08:58:06

photograph is a luxury hobby, isn't it? -爱听歌的奥黛丽- 给 爱听歌的奥黛丽 发送悄悄话 爱听歌的奥黛丽 的博客首页 爱听歌的奥黛丽 的个人群组 (0 bytes) () 02/21/2021 postreply 09:51:53

摄影穷三代,还好现在不用胶卷了 -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 02/21/2021 postreply 11:58:05

恭喜花董。首页进来,谢谢网管,HobbyShow活动Vintage restoration挂首成功:) -beautifulwind- 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 beautifulwind 的个人群组 (0 bytes) () 02/21/2021 postreply 15:30:54

Thanks for shedding light on this subject! -LYJiang- 给 LYJiang 发送悄悄话 LYJiang 的博客首页 LYJiang 的个人群组 (0 bytes) () 02/21/2021 postreply 15:32:10

赞花爷高品。。。莺歌流水还那么牛。。。 -沿途美景- 给 沿途美景 发送悄悄话 沿途美景 的博客首页 沿途美景 的个人群组 (128 bytes) () 02/21/2021 postreply 19:48:57

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