I am experimenting with 10-stop ND filter and an app to calculate exposure time, to get long exposure in daylight on Sony A7R5. If the app suggests an exposure time of 2 minutes I dial that in to the exposure time under Bulb Timer Settings. Exposure turns out fine. Then I thought, lets see what happens if I dial in an exposure time of 3 minutes. You would think it would be way over exposed, totally blown out, and it is when I try the same experiment on my DSLR. However the shot comes out fine again. Tried various other timings to try to over expose, but shot always came out fine. Totally baffled.
hey! i just happened to have exactly the same problem; and found a solution!
(i am on α7sIII but menu should be similar since all are on the fx3-style now?!) anyway:
in the settings, you need to go to the playback (blue) settings in the alpha and find viewing, there should be a slide show option to click!
(if its greyed out - go to playback target and put the view mode to date view - this should do the trick)
ps.: in the slide show you can define a time in seconds, it only affects photos all videos and photos on the card are played in a row, with just a little still-freeze between them.
Thanks for reply, just awaiting a new cable, I noticed the charging LED in camera was lit but it was not charging. Made a lash up with adaptors to temporarily replace the cable and all was well, the camera went to Mass Storage,