Alkaline batteries are notorious for losing voltage with high current draw. If used in an unbalanced meter circuit (most older CdS cell meters) the exposure with vary with light level, leading to severe over-exposure in bright light. I ruined a couple dozen rolls of film in my OM-1n that way. Voltage also drops off a lot as the charge is used, causing more trouble. Not as issue with balance meter circuits (Pentax K1000 for instance).
Silver oxide drops off far less than alkaline with current draw, and tends to stay pretty constant until exhausted. Far better choice UNLESS the camera was designed to use mercury cells. Will over-expose at least a full stop with a silver oxide, 1.54V vs 1.35V. Can be fixed with a diode in circuit, or in an adapter. If you use the camera a lot, a zinc-air hearing aid battery the correct size works very well, but they only last a few weeks once you peel the seal off. Cheap enough, I use them a lot.
Lithium batteries are worse for current induced voltage drop.
