I am left puzzled as to why we do not have a wider range of aspect ratio choices with mirrorless cameras. This would be seriously useful for visualising images and must be very easy from a firmware perspective. Are you looking for more than the usual 3:2 and 16:9 options?
They’d just need to black out everything outside the frame shape you’ve chosen and place the image data in the same place – that would not need to change. If shooting RAW you’d still get the entire frame and JPEGs could be cropped to the aspect ratio selected. It would be very easy for camera makers to add this feature and a list of common aspect ratios, all the way from 1:1 to 3:1. Having the image masked off in the finder really does make working with a different format much more effective. It’s hard to ‘think’ 1:1 if you are seeing through a 3:2 finder. It’s even harder with panoramic formats. For DSLRs, mechanical masking would be needed, but for mirrorless, surely it would be an easy extra feature to add?
What do you think?
I may lobby Fujifilm to consider this, as they would appear the most likely to consider it and I assume it could be added in a future firmware update to older models.