Ektar is ISO 100, which I would rate at 50, vs ISO 400 which I rate at 200. So yes, it's just two stops, but ISO 50 is really tricky if you're not shooting landscapes on a bright sunny day. It's much harder for a portrait subject to hold still for 4 seconds instead of 1. Even if I'm using 160NC, I'll need to take another safety of every shot, which means my film & processing budget just doubled. And the shots still won't be as sharp as they'd be on 400.
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