“If A6000 limits the lens to 30mm then what is a better lens for astrophotography”
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The “Industry” has done a poor job of explaining what you’re describing- the reduction in angle-of-view obtained when using a full-frame lens on a crop-frame body. You’re correct in your statement that this 20mm lens acts like a 30mm on an A6000, which is due to the lenses angle of view with a full-frame sensor. The 20mm lens you’re asking about has a 94.5 degree angle of view when used on a full-frame sensor but is narrower on a crop frame like the A6000, at 74 degrees, meaning not as “wide”. It’s still a very sharp lens (the “corners”, which a lot of Astro photog’s talk about will be even sharper on your A6000 because they won’t be as close to the edge of the image-circle of the lens) but you won’t see as much of the sky/foreground as a shorter focal length lens. I’m not super familiar with Sony’s lens catalog for the crop-frame cameras, but you’re looking for something in the 10-16mm range to recreate that expansive feeling of “wide-angle” and hopefully an aperture of F/2.8 or brighter (smaller #’s are “brighter”) . Most zooms for the crop-frame cameras aren’t suited for Astro photography due to their smaller starting apertures, making exposure times too long to work well for uncorrected (not using a tracking telescope-type mount) astro photography. If you plan of sticking with the crop-sensor bodies, the Zeiss Touit 12mm would get you a suitably wide angle of view (the same angle of view as an 18mm lens on FF). There may others but sticking to what Best Buy offers, this seems like the best suited to Astro photography in my mind. Best Regards, Happy Holidays!
I would recommend:
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