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標題: [Photography] Lumix GH1 & 20mm f1.7 作單筒攝影
cwchan
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發表於 2009-12-11 17:00  資料 文集 短消息 
Lumix GH1 & 20mm f1.7 作單筒攝影

Special thanks to Mandy who gives her GH1 and 20mm f1.7 pancake lens for my digiscopic testing.

All the test shots here were taken on 10.12.2009 at Mai Po.
A very hazy day

The setting
ISO 100,
Taken in RAW, converted to TIFF and then to JPG by using Silkypix (recommended by Panasonic) and Photoshop respectively.
Using the original electric shutter cable release to reduce human vibration.
A-mode (aperture priority)
Lens ( the pancake 20mm f1.7) setting at its f2.8 for all the shots.

Pros
Fast and able to get precise automatic focus with my 30X scope.
Light weight ( about the same weight of my old Nikon 8400).
Bright electric view finder. It brightens automatically at dim situation.
High-eye points, very usefully for spectacle wearers as we need not to come too close to (to touch) the view finder which may cause vibration.
The shutter vibration is not so obvious (most probably due to the presence of the long-plate to support the system).

Cons
Noticeable shutter release time lap.
The 20mm lens is not so sharp as expected.

Suggestion for improvement of the lens in field usage
The focusing design of the 20mm f1.7 lens is a front glass moving. My DCA has to be connected to the front ring of that focus lens directly. When the lens goes to get for focus, it goes in and out. That means, when the camera is placed on the scope via the DCA, the automatic focusing mechanism (inside the lens) carries the whole weight of the GH-1 and the lens while focusing. It will certainly slow down the automatic focus movement and, in some degree of extent, overstress the focusing gears inside, eventually causing rapid wear and tear of the lens.

If a coupling ring is made with one end connecting the DCA directly and the other end to the barrel of the lens as per photo No.3 (the green sketch), it functions like an internal focus lens, the weight is transferred via that coupling ring to the DCA without affecting the movement of the focusing mechanism, then the problem mentioned above will be solved.


No.1 The setup


No.2


No.3


No.4 At the far away side of Bird hide No.9


No.5


No.6


No.7


No.8


No.9  The original uncropped image


No.10  The 100% cropping of No.8 above


[ 本帖最後由 cwchan 於 2009-12-11 18:25 編輯 ]

本帖最近評分記錄
L-mike   2009-12-12 22:11  種子  +10   
sammysam   2009-12-11 22:10  種子  +10   感謝分享 Thanks for sharing !
puppymic   2009-12-11 19:12  種子  +10   資料詳盡 Exhaustive information !
神經肚   2009-12-11 17:22  種子  +10   實用資料 Useful information !
特別懶散   2009-12-11 17:18  種子  +8   精彩圖片 Brilliant pictures !
HongN   2009-12-11 17:15  種子  +10   超水準之作 Awesome !
blackdogto   2009-12-11 17:15  種子  +7   感謝分享 Thanks for sharing !




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puppymic
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來自 Hong Kong
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發表於 2009-12-11 19:11  資料 文集 短消息 
多謝晒你咁詳盡既測試報告

個 Panasonic 20mm 唔夠sharp,會唔會因為太大光圈 / 因為受到自動對焦時既郁動所影響?

咁師傅可唔可以幫我整番個接環 (as per your suggestion)  ?




http://hk.myblog.yahoo.com/puppymic-c
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cwchan
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發表於 2009-12-11 19:27  資料 文集 短消息 


QUOTE:
原帖由 puppymic 於 2009-12-11 19:11 發表
多謝晒你咁詳盡既測試報告

個 Panasonic 20mm 唔夠sharp,會唔會因為太大光圈 / 因為受到自動對焦時既郁動所影響?

咁師傅可唔可以幫我整番個接環 (as per your suggestion)  ? ...

大光圈是主因。
雖然如此,它表現都很平均,是很好的組合,放心使用。我素來不喜愛加太多sharpening,所以會覺得太柔和。

咁師傅可唔可以幫我整番個接環 (as per your suggestion)  ?

我會同chan c-fu 聯絡,無問題。

加多兩張該日在路上拍。







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L-mike
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發表於 2009-12-12 22:12  資料 文集 短消息 
If possible, can you test GF-1 for us...............
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cwchan
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發表於 2009-12-13 16:44  資料 文集 短消息 
今日天睛,再試。

ISO100, 1/200 second, f2.8

Original uncroppped  image


Portion of above shot




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