Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Panasonic FZ300 and Panasonic GH1 side-by-side from the front, back and top in their relative dimensions. Panasonic FZ300 has external dimensions of 132 x 92 x 117 mm (5.2 x 3.62 x 4.61″) and weighs 691 g (including batteries). Panasonic GH1 has external dimensions of 124 x 90 x 45 mm (4.88 x 3.54 x 1.77″) and weighs 385 g (0.85 lb / 13.58 oz) (including batteries).
Below you can see the front view size comparison of Panasonic FZ300 and Panasonic GH1. Panasonic GH1 is clearly the smaller of the two cameras. Its body is 8mm narrower, 2mm shorter and 72mm thinner than Panasonic FZ300. As you can tell, actually this is not a fair size comparison since Panasonic FZ300 has a built-in lens but Panasonic GH1 doesn't. Once you put a lens on GH1, its thickness will increase significantly.
Comparison image of Panasonic FZ300 and Panasonic GH1 Size, Weight and External Dimensions - Front View
Now lets look at the top view comparison of Panasonic FZ300 and Panasonic GH1.
Top View Comparison image of Panasonic FZ300 and Panasonic GH1 Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic GH1 is significantly lighter (306g ) than the Panasonic FZ300 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on GH1, the total kit will weigh much higher.
Weather Sealing
With its weather sealed body, we believe that FZ300 has a big advantage over GH1 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Panasonic FZ300 and Panasonic GH1's LCD screens has the same diagonal size of 3.00".
Both cameras feature
Fully Articulating screens where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. Fully articulating screens are also useful for taking Selfie shots and video.