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As Gary and Tony have said, in this day and age of digital imaging the old barlow and slr have gone by the wayside. The only imaging you would do with it would be solar, lunar, Venusian, Jovian and Saturnian. They would be about the only objects bright enough, and you wouldn't get much image scale of the planet with that setup anyway.
If you have a look at the images. The first is Jupiter at around 2000mm focal length through a 35mm slr, the second is 1000mm focal length prime focus and the third is with a 2X barlow. As you can see you can do moon shots np, but Jupiter is far from exciting
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