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hey guys im going to buy a A7r2 and i wonder what lenses you would recommend for landscape photography im thinking about the ZEISS Batis 2.0/25 E-Mount or should i get the ZEISS Batis 2.8/18 E-Mount i would love to hear your thoughts

All, I recently purchased a Sony Alpha camera and have a 18-105 mm F4 zoom lens. I want to learn how to do aperture priority photography correctly for landscapes. So here is the first question. If I manually set the zoom ring on the lens to any setting, it will maintain a constant aperture of F4. However, if I use aperture priority mode and adjust the dial on the top of the camera I can adjust the aperture - I can adjust this down to F22. I don't understand how this works as from what I can tell the sensor is right there next to the lens mount and I do not see a shutter or aperture. Where is the aperture that is being adjusted and how does this relate to the F4 rating on the lens. Is it correct to assume that the widest the lens can go is F4, but this aperture is stepped down to F22 inside the lens? If so, are the stepped down apertures constant over the zoom ranges? Sorry - probably a basic question, but I don't know the answer. Here is my second newbie question. In using aperture priority for landscape photography what are your techniques? I used the camera in aperture priority mode and adjusted the dial for an ISO of 100, then snapped the pic. I noticed a lot of landscape pics use ISO 100 settings which drove me to this. However, after looking at the shots I found them to be a bit over exposed. The few pics I took in auto mode came out decent, but I really need to improve my technique. Is it better to use the Aperture priority and set my F-stop to say F7, then use the back dial to adjust ISO to 100 and let the camera do the work of making the exposure correct with the shutter speed? If I want to change the exposure should I use exposure compensation or just play with the ISO dial? I searched and Googled this topic but didn't find a consistent recommendation, so I'm here asking the experts what technique they would recommend for someone like me. Thanks! Chris

Hello, I own an A7R2 and wondered if there was at least one decent APS-C wide lense (≤ 21 mm fullframe focal length) that is: - a prime - fast (at least F1.8) - with autofocus - E-mount or Canon EF mount (adaptable with a speedbooster or MC-11) - not too noisy (like the Sigma art primes) By decent I mean no chromatic aberration, I don't mind a little vignette or blur on the edge for 1080 video. The only one I found was an APS-C 19mm, I think F1.8, with chromatic aberration. Thank you for your help, Simon