A larger pixel size means lower resolution, yes. If you image a photo made up of squares (which is what a digital image is), a photo with smaller squares will have smoother curves on it as opposed to noticeably blocky shapes from point to point. This becomes more of an issue when you really zoom in; it will not be as big an issue for things nearby. The trade-off is that smaller pixels have a smaller "bucket" to collect photons, so in low light conditions, like twilight or night, smaller pixels need more time to create a brighter image than sensors with bigger pixels. Just something to think about if you plan on looking for nightjars and owls. --
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