2. Yes. Sony a7m4 camera is the latest model of Sony α series officially released by Sony Company on 202 1 and 1, and it is only suitable for some Longteng apertures. Sony a7m4 camera can't recognize Longteng aperture, which is caused by the compatibility problem between camera and aperture. It is suggested to consider upgrading the lens firmware to solve the problem.
3. the recommendation is as follows: Sony FE502GM is preferred. There is a simple reason. Sony's first F2 is light in weight and surprisingly high in image quality. If the budget is in place, like 50 focal length, it can be said that it is the best fixed focus hang-up option.
4. Sony 24- 105mmf4 is a zoom lens with high cost performance, which can meet the needs of daily shooting. Sony 85mmf8 is an excellent fixed-focus lens, which can take portraits or portraits. The combination of these two lenses can meet most shooting needs.
5. Sony a7m4 travel photography is very suitable for choosing Tiger Baltar, Sony 24- 105mmF4 or Longteng 28-200mm F8, which is a very practical focal segment for daily use.
6. Original factory 16-70F4 The logo of this lens is Zeiss, and the aperture is constant F4. The quality is very high and the picture quality is satisfactory. And its equivalent focal length is exactly 24- 105, which just meets your needs. Longteng 17-70F8 is of higher quality.