And now on with today's pre-written blog...
With what I use my current photography for (computer and projection purposes) you can easily get by with smaller-sized images that still look razor-sharp...it's when you go to the print stage that things change, and you need lots of megapixels to make a great enlargement.
My Canon has the ability to shoot RAW images, which are massive in size and can be greatly manipulated for post-production purposes (as long as you know whattheheck you're doing in Photoshop, for example). I just never bothered with RAW as I've not been gunning for the printing stage; however, I thought I'd experiment with my suet feeder friends and see how much more I can capitalize on getting really detailed images of the winged ones.
There is still the 'battle' of ISO selection and the 'noise' trade-off, with needing to freeze the birds or catch them unusually still...all while shooting through a pane of glass and trying to get the focus spot-on...with a super-telephoto zoom, there is very little distance in the plane of focus at many apertures, hence you shoot scads of shots in hoping there are a couple of goodies in there.
And here are 3 that go a little further than earlier posted pictures. As always, click on pics to enlarge 'em: