40 vs 50mm on a 3-9x or 4-12x

[180ls1]

My dad who is 72 needs a little help with light gathering at twilight. We are looking at upgrading to a 50mm objective over his current 40 but I am not sure it will make much of a difference.

It would be a vx-3hd, we might even spring for a 4.5-15x which may be more impactful.

 

[gr8fuldoug]

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