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