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We have some similar photographic interests.

 

Now that you have the a7r Mk 2, have you considered getting a tilt/shift lens? Focus stacking works for some things, photomerge using a lens rotated around the entrance pupil for some, and tilt/shift for others.

 

The Canon EOS T/S lenses use electronic aperture setting which runs the adapter cost up unless using other EOS lenses on the same adapter. There are a number of alternatives ranging from Samyang's 24mm T/S to Canon FD mount T/S to adapting a medium format lens (provides a generous image circle for shift).

 

If using a tripod for a relatively static scene, shift can provide some very wide angle, high resolution images via photo merging without pixel stretching or perspective issues. I went through the angle of view calculations for the Canon 24mm if shifted to the point Canon's specifications state it starts to vignette. By merging shifted images it can provide an angle of view equivalent to an 18mm lens.

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We have some similar photographic interests.

 

Now that you have the a7r Mk 2, have you considered getting a tilt/shift lens? Focus stacking works for some things, photomerge using a lens rotated around the entrance pupil for some, and tilt/shift for others.

 

The Canon EOS T/S lenses use electronic aperture setting which runs the adapter cost up unless using other EOS lenses on the same adapter. There are a number of alternatives ranging from Samyang's 24mm T/S to Canon FD mount T/S to adapting a medium format lens (provides a generous image circle for shift).

 

If using a tripod for a relatively static scene, shift can provide some very wide angle, high resolution images via photo merging without pixel stretching or perspective issues. I went through the angle of view calculations for the Canon 24mm if shifted to the point Canon's specifications state it starts to vignette. By merging shifted images it can provide an angle of view equivalent to an 18mm lens.

I just scored a Canon FD 35/2.8 TS - a cracker of a lens I used to use with film years ago, now so much more useful on the Sony (most clients couldn't cope with 35mm film, even though the lens is great). I paid $500, and $20 for the adapter. Worth keeping a lookout for - once you get one, you'll find yourself adjusting the plane of focus for all sorts of subjects...

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