M101 Pinwheel Galaxy (NGC 5457)
Size:22'(170,000 ly dia.) Mag:7.9 Dist:27 mly

Camera: Canon EOS 300D Digital Rebel
Lens: Sigma 70-300mm APO @ 300mm, f/6.3
Exposure: 21x25s=8.8 min @ ISO1600
Mount: ETX-90EC polar aligned
Processing: Dark, flat and bias calibration, alignment, stacking and digital development in IP 2.5. Alignment in Registar.
Levels, curves, skyglow & noise removal and shapening in Photoshop CS with Neat Image & Gradient exterminator. Image cropped.