本帖最後由 Pandachief 於 2015-1-3 02:45 編輯
Very cool to have such topic.. next we should talk a little may be on base plate differences.. or shutter buttons.. or the shutter counter fonts differences....each can form it's own topic!
Pandachief 發表於 2015-1-3 01:54
I don't have my 7003xx with me now but that is the camera with early ASA200 back door but no dots at ...
即係話，以全圓型dots計，至少有四個版本：
1. None, as your 7003xx.
2. Two dots.
3. Three dots, with the left and right ones closer to centre.
4. Three dots, with the left and right ones closer to edge.
有冇第五呢？期待新發現。
本帖最後由 grandetech 於 2015-1-3 07:13 編輯
bubu 發表於 2015-1-3 03:12
即係話，以全圓型dots計，至少有四個版本：
1. None, as your 7003xx.
2. Two dots.
FYI, my later M3 is type 3. s/n 776, big font ASA200, got one half dot at door edge.
I think for dots is quite random.More interesting is the screw for the lock..
製造背蓋的鋁板是点滿圓点, leitz切割一大塊鋁片時会避免圓点在邊位
意思即是全片背蓋都有圓点, 祗要取走 film pressure plate 便見滿佈圓点,
圓点位置不是数據請不理会, 统計圓点是無用的
round marks position 跟切割有関,同期数完全 ?:L
eastsea 發表於 2015-1-3 15:33
round marks position 跟切割有関,同期数完全 ?
我們所討論的，不只是背版上大圓點的位置，其實包括有兩點定三點，圓點的深淺，及背板兩側那個半圓亦有討論到。
根據多年觀察，那幾個圓點是越後期越淺，到再後少少什至已經完全沒有。
而兩側的半圓痕只有在最早期的M3身上見過。
當然，這些數據只是管中窺豹地在見過的M3中取樣出來，所以才需要公開討論一下，希望能取得更多實際資料數據。
師兄可否上些圖片，令討論更具體化？
Distance between the circles are different too! I believe we can follow it up and find out the differences in raw materials used from different batches of M. This can help identify if back door is really original to the body but not exchanged later.Leica is about identifying combination of facts to determine the authentication of it! Every detail count!
多謝一位會員借圖貢獻，M3 - 7006XX 起角，兩個圓點，冇鏍絲，兩側有半圓壓痕：
仲講圓点哎:L
eastsea 發表於 2015-1-3 19:36
仲講圓点哎
Why not?? I think discussion of the nature and characteristic of any raw material of Leica is very interesting.
But personally I don't have much interest in Leica SLR.
看清楚頂売內的圓点,便應明白,但若仍未明白就算了
I thought it would be nice to share the passion for M3 and possibly create some more awareness in fellow collectors. Those information is my own personal guide for collecting and the information may not be absolute. In fact, I expect there will be some disagreement and I welcome the discussion and corrections that follow, but a proper manner is necessary. I hope vintage Leica collectors who are not focused on Early M3 may also find some of this information useful because many of the concepts can be applied to collecting other models.
如果我冇估錯既話，嗰啲圓點應該係壓鑄背蓋時用於脫模既頂針位，唔同位置既圓點係出於唔同既模具......
feipo 發表於 2015-1-3 22:24
如果我冇估錯既話，嗰啲圓點應該係壓鑄背蓋時用於脫模既頂針位，唔同位置既圓點係出於唔同既模具...... ...
原來係咁，越來越淺色係咪因為件工具用得越來越多而開始磨蝕呢？
Feipo兄可唔可以再解釋一下, 謝謝，學到野了。
C9.99 發表於 2015-1-3 23:02
原來係咁，越來越淺色係咪因為件工具用得越來越多而開始磨蝕呢？
Feipo兄可唔可以再解釋一下, 謝謝，學到 ...
即係在M3在製造初期，壓鑄背板有幾套不同模具，佢地既圓形頂針位有兩圓或三圓，位置亦各有不同，而由於損耗或維修，導致頂針越來越短，咁，背板上既圓印就越來越淺...
這樣，合乎越後期既M3，圓點越淺既現實了。
eastsea 發表於 2015-1-3 21:00
看清楚頂売內的圓点,便應明白,但若仍未明白就算了
無能力為自己的論點多作解釋說明，就算了。或是無心討論分享的，也都就算了。
看多一個參考M3 - 745109
feipo 發表於 2015-1-3 22:24
如果我冇估錯既話，嗰啲圓點應該係壓鑄背蓋時用於脫模既頂針位，唔同位置既圓點係出於唔同既模具...... ...
對的。
http://youtu.be/h2A7oUMeLmM
影片6:17可以見到die casting m/c 裏 ejection pins把鑄件脫模的實況。
所以不同的鑄模便有不同的痕跡了。
擺2支定3支pins係一個位置，是模具師傅的決定。我估leica的設計師也沒有過問吧？
這些可以算是部件的指紋，但誰知有多少隻手呢？
如果睇唔真可以睇呢段plastic嘅.....
http://youtu.be/eOr-lpny13U