Hi, 

Anyone using the Esprit 150 + the 0.77x with full frame camera? Any Vignetting? How are the stars at the corners? Does it need cropping of image to get good stars at the corners? I am looking to create 3x2 Mosaic and Bad Stars/ Vignetting will hurt my plans as I cannot afford more than 20% overlap in the mosaics to get uniform stars. 

Thanks,
Deepan
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