pentaxuser
Member
It depends on where your daylight is. If you live above latitude 55N then less than 400 can be a problem for all except a few weeks of the year in summer and then only the odd 1-2 days at a time for almost all of the rest of the year. From mid Oct to mid Mar there may be no days at all when 100 is sufficient.What do you mean “only iso 100 film”??
Iso100 is the perfect speed for daylight shooting.
Iso 400 in daylight/sunlight is such a waste. Poorer image quality combined to 1/1000@f16 is not something good.
pentaxuser