cwchan

Panasonic pancake 20mm f1.7 (setting at f4.5)
Olympus pancake 25mm f2.8 for 4/3, need adaptor for using on Panasonic G1(setting at f4.5)
Panasonic kit 14-45mm zoom (setting at 23mm f4.8)

All were used on Lumix G1, setting at ISO 100, in raw format, process in Silkypix without any post-adjustment.
A 30X scope is used in the test.

The original cropping

The 20mm


The 14-45mm zoom at 23mm (very serious vignetting at the four sides/corner)


The 25mm


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The following are 100% cropping of above images
The 20mm


The 14-45mm zoom at 23mm


The 25mm


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The auto focus of these three lenses all work fine in my 30X scope.
The 25mm Olympus performs a bit soft when compare with the other two Pansonic lenses, this is not strange due to its longer focal length and my G1 might not be equipped with the appropriate firmware that the lens is not fully compatible with my G1 giving the best optical result.

[ Last edited by cwchan at 26/04/2010 18:39 ]

cwchan

Hi Peter

(a) Prime lens is for those who asking for the best optical sharpness and light weight. For convenience, zoom lens absolutely wins the prime lens in field usage. However, don't forget the long side of the zoom lenses are normally not acceptable in sharpness.
(b)Your are right, the old design is not strong enough in the rough field usage. However, Chan C-fu modified it. The mount is now strong as tank.

CW

cwchan

Quote:

Original posted by lwingkay at 28/04/2010 10:10
Dear Chak Wing,
You're using Panasonic G1 for digiscoping. Two questions for your expert advice:
1) The first question is about using G1 with Swarvoski's TLS 800.
My intended combo is 80 HD STM + TLS  ...

Hi Peter,

(1) A very good suggestion, if you intend switching from one system (nikon) to another(the m4/3) from time to time. Alternatively, you can also get the T2-m4/3 mount direct, which can be bought in the market.
(2) Yes, there is a manual focus enlarging spot for your ease focus in G1 and GH1, a very useful function indeed, in particular for this 800mm f10 slow lens . I have no idea if other models also equipped with this device.

CW

cwchan

Quote:

Original posted by lwingkay at 28/04/2010 16:09
Re: you can also get the T2-m4/3 mount direct, which can be bought in the market.

I should have asked the following in my first posting on this.
a) whether there is a mount for linking the TLS 800 wi ...

(a) There is one single mount (T2-m4/3) with its one end (the screw side) fitting to the scope and the other end to G-1 body. Try the shops at Apliu Street.

(b)Automatic metering is possible, and very accurate too, in the G1. Just setting the DC in A-mode(Aperture priority), the DC does the rest, no need to doing anything.

(b) You can move the spot manually to the location  which you want to enlarge for precise focusing. Very useful.

cwchan

Quote:

Original posted by lwingkay at 10/05/2010 23:23
Dear Chak Wing,

Re: Olympus pancake 25mm f2.8 for 4/3, need adaptor for using on Panasonic G1(setting at f4.5)

I asked this with some shopkeepers in Mong Kong's camera shops and was informed that th ...

Sorry for reply late because not in Hong Kong.

(a)The Olymbus 25mm f2.8 is designed for 4/3 system, it needs a Olymbus MMF-1 (or2)adaptor before it can be used on its mini 4/3 system, like Pen or G-1 GH-1,,, etc. With this MMF-1 adaptor in place, it can perform auto-focus, auto-matering function fully.

(b)This pancake lens is not IF, the front group goes out and in during focus. You need a 43mm to 52mm aadaptor ring for joining the filter mount of the lens to the DCA. However, this may damage the gears inside the lens due to the weight of the body.

CW