For something to that distance, you’re going to need a long focal length lens. It’s hard to find a true conversion from a spotting scope to lens, but from a small amount of googling it seems like a 50x spotter would be equivalent to something like a 1000mm focal length lens.
With your camera having a cropped sensor, you’ll effectively get about an additional 1.5x zoom. So, for instance, if you purchased the Sony E 70-350, it would be more similar to a 105-525mm equivalent. This would likely be a bit short for your needs. Additionally, within my Sony a6600, I can zoom in a little further than the normal sensor range. This would be considered digital zoom, but you won’t lose quality till after 2x, or so. I’m not sure if your model does this, but I imagine it would. You could then push a smaller lens like the 70-350 to an equivalent of about a 1000mm lens.
For what you want, I think the Sony FE 200-600 (would equate to a 300-900) would probably work. It’s a big lens, but you should be able to spot impacts at 1000. Additionally, with in camera zoom, it would be pushing close to a 1800mm equivalent, which would likely be more magnified than a lot of spotting scopes could achieve without a magnifier.
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