Our spies have photographed and filmed the new Opel (Vauxhall in Britain) Astra Convertible on test in Germany. The vehicles caught testing here are early prototype models as the front doors appear to be carried over complete with their frames from the hatchback model.

Nevertheless, we are offered out first look at the open-top version of the new Astra series, which is planned to go on sale by early 2013. The most important change over the previous Astra TwinTop is the replacement of the more complicated, heavier and costly retractable metal roof with a traditional fabric hood.

This solution should also have a positive effect on the Astra’s weight and consequently, help improve handling and fuel efficiency.

The test models are heavily based on the freshly revealed Astra GTC sport hatchback featuring a longer rear end to improve the car’s looks and increase the available space for the rear passengers and the luggage compartment. Inside, the Astra Convertible will have room for four passengers with individual seats.

Don’t expect any surprises under the hood as chances are Opel and its sister brand Vauxhall will borrow the Astra GTC’s range of gasoline and perhaps diesel engines.

If the past is anything to go by, Opel will most likely tease the Astra Convertible with a near production concept model either in Frankfurt this fall or in Geneva next spring.

Recent reports from the U.S. suggest that GM is considering both the Astra GTC and the Convertible shown here for its Buick brand, but this has not yet been confirmed.

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