The 810A is specifically designed for astro-photography. It has a modified IR-cut filter so the sensor can capture the type of light emitted by things like nebulae. It also has some additional features to support long exposure photography if memory serves but I don't recall the specifics.Can somebody tell me what the differences are between these two models other than nearly $1000 in price?
I'm exploring getting an FX body but DON'T want an AA filter so I'm NOT looking at the D750.