Hi Chris,
I have the 70-200mm f4L (non IS).
Most of the shots on my web page in my signature below were taken with this lens. I added a 1.4x Extender for a bit of extra reach with no noticeable degradation in image quality. Probably the cheapest L lens but one of the best.
Used it for both day and night use - sharp as! Never had any problems without the IS either.
Doug
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