When I switched to mirrorless in 2012 I chose the micro 4/3 system with the Panasonic GH2. On of the most offered lens of the system was the Panasonic 20mm F1.7. Although it had some shortcomings like the noisy and slow autofocus motor you could hardly complain about its image quality. It was sharp straight from F1.7, one of the best amongst the micro 4/3 lens. I used this lens a lot on photo walks and holidays. This was the point when I fell in love with the equivalent 40mm focal length.
So far my longest lens for landscape was the Zeiss Sonnar 55mm F1.8 in my bag. Recently I often found myself in situations where I wanted just an intimate crop in the frame and 55mm proved to be not long enough on the Sony A7II. For full frame E-mount there is no budget tele-zoom option. Either you buy one of the FE 70-200mm versions or the FE 70-300mm. I consider the 100-400mm GM too heavy for myself. All these lenses cost a fortune and I don't want to spend that much. Fortunately adapting Canon lenses to Sony bodies is relatively easy and there are lot of different auto focus adapters available. I picked the Canon version of the highly regarded Tamron SP 70-300mm F4-5.6 VC USD lens used from eBay and a Viltrox EF-NEX IV auto focus adapter.
Is it really worth 10 times more?
I've been using my Canon new FD 35mm F2.8 lens with adapter on my Sony A7 for almost a year now. I decided to try the Zeiss Loxia 35mm F2 Biogon so I bought a nice used copy from eBay
Full frame 35mm is thought to be the most versatile focal length. When I go on a day trip with my family most of the time I use this. So far my old Canon nFD 35mm F2.8 did the job for me. Although being not a recent design it's a very solid performer on the Sony A7. The only thing I really missed was the autofocus capability. When the first rumours emerged that Samyang was going to release a native, 35mm, AF, pancake, full frame lens for Sony E-mount knew I would go for it.
After my bad luck with the Vanguard Alta Pro 2+ tripod I decided to go with a safe choice.