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"Canon will announce an update to the EF-S 55-250 f/3.5-5.6 IS by adding STM and some optical upgrades"
I use the RAW picture format. I use the preview image on the screen to check exposure, but that's about it.
No, you don't. There's no 'RAW format' - a RAW 'image' can't be viewed. What you're looking at on the camera's LCD is a JPG image, converted in-camera with whatever settings you have (picture style, ALO, high ISO NR, etc.). Those settings don't affect the RAW data directly (with the exception of long exposure NR and sort of but not really HTP), but they do affect the JPG preview image stored inside every RAW file, and the histogram is based on that JPG. So, to the extent that you make exposure decisions based on that review image or histogram, your selected picture style, etc., can affect your RAW images.
Get out there and shoot something meaningful today.
Just wondering, how often do you (the readers) shot at 2.8 and want something faster?
Or is the desire for better AF or ?
This will be a large 24-70 lens (just like the 70-200 F2.8 is larger than the 70-200 F4). Unless the IQ is significantly better than Canon's at mid apertures, I will skip this lens.