The astrometrical reduction of wide-field images is improved by taken into account of the optical disortion. The distortion can be like previously measured (then corrected) in manually mode by comparing the position of stars in the images and the position of these same stars taken in an astrometric catalog ). But it is now possible to find automatically distortion parameters during a first iteration of the astrometrical reduction (Iris fit observed stars and catalogue stars for the distortion solution). In a second step, Iris correct the barrel-distortion of the image and re-run a precise astrometric reduction. Dialog box Astrometry (Analyze menu) was modified to allow to calculate the disortion and correct the image geometrically (exactly as if the image were made with an optics free of distortion).

Version 5.52 of Iris adds the possibility to read and process RAW files from Canon EOS 40D, Nikon D3, D300 and Sony Alpha 700 Digital SLR camera. It is also possible to remote control Canon 40D for exposure longer than 30 seconds (directly by using USB interface, without the use of an external electronics)

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