Removing darkvision from playable races – how to compensate?

I am homebrewing a post-apocalypse style world for D&D 5E, intended to be a mashup of Mutant Year Zero and D&D 5E. Thematically, one major point is that the world has been thrown into a perpetual night. I want this to matter to the player characters, and be central to problems they face. That means more emphasis on managing light sources and that special forms of vision that bypass darkness should be exceptional.

I’d like to alter the standard playable races with darkvision, replacing it with low-light vision (the ability to see normally in areas with dim light), plus some compensating factor, which I will probably choose thematically for each race. The goal is that these races should still be solid choices, as valid as before, but that they don’t overshadow (no pun intended) races without darkvision due to the setting.

I am not quite sure what the downgrade darkvision -> low-light vision is worth in terms of reasonable compensation from an extra race feature. A proficiency? A known language? A situational bonus? I’m guessing that it is around this level in a normal setting.

In the setting, areas with dim lighting will be a very common adventuring environment (basically outside at night on 50% of nights), so low-light vision is still a noticeable benefit. Perhaps this fact means that I should not need to compensate anything? As despite the fact that I am strictly downgrading the ability, in the setting the new ability will be relevant a lot of the time, perhaps just as much as darkvision would be in most other settings.

I have seen the question What would happen if I removed darkvision? and that helps me understand that removing darkvision entirely makes for a workable game. However, I don’t want to short-change players choosing a Dwarf or Half-orc PC at the start of the game. I will of course be sharing homebrew changes and setting details before play starts . . . so this is more about having players who would naturally choose, say, a Dwarf, feel that the race was just as viable as in any non-homebrewed setting.

How do I compensate for lack of minimum shutter speed when in Av mode with the Canon 750D (Rebel T6i)?

I’m fairly new to photography, and I own a Canon Rebel T6i. Besides manual mode I’ve learned about Tv and Av modes, which to be honest I really liked, mainly when I’m shooting on events with changing lighting conditions and I’m find myself too slow to change the settings for every shot. I like the idea of the Av mode very much for event photography, however the last time that I tried I had a huge problem, the shutter speed was too slow (I was using a 24mm f2.8 pancake lens) so when I got home I find out that most pictures were taken at 1/25 sec, even some at 1/60 were blurry, given that I don’t have super steady hands and people were moving.

After some research I found out that some cameras allow you to set a minimum shutter speed when in Av mode. However my camera doesn’t seem to have that option. I would like to set the minimum shutter speed to at least 1/125 (1/200, would be the best for me right now), but I can’t. So I often find myself shooting events at Tv with a shutter speed of 1/125 or 1/200, but the results aren’t ideal since I can’t control the aperture.

What I’ve tried lately to try to compensate for the lack of a minimum shutter speed in Av mode is to set the camera to manual with ISO on auto. This way I can set the minimum shutter speed (but I’m stuck to it, if the lighting conditions improve I could be taking pictures at a higher shutter speed) and I have the control of the aperture, leaving the ISO to balance the exposure. Far from ideal, I would guess, however is there a better way to achieving this with my Rebel T6i?

I know I could just be using full manual, but as a beginner it can get pretty awkward to have people in events posing and waiting for the to find the best exposure in full manual. Is there a better way to do this or should I just embrace full manual.