Off on a tangent.... Portra has a nice range to 800. yes. Speed not as limited as commonly imagined, and the resurgence of film has some new emulsions introduced, along with some old emulsions revived. Keep eye open on this. You may want to look at the APUG web site which is large format, or
www.rangefinderforum.com....
Lot's of MF activity there.
What I want to mention here is that you mention landscapes and I like panoramic landscapes.
I was on the verge of pulling the trigger on about $2500 of 6X17 equipment, but I gotta say, I'm a real cheapskate.
So, I started shooting two and three frames overlapped with my Fujica G690 6X9. Then I send the film to ProPhoto Supply in Portland, for processing and Hi rez scanning (I usually just get the overlapped frames scanned by specifying frame numbers)
Then when I get the negs and scans back, I load the scans into my computer. Then I stitch the frames with Pano software, although Elements and Windows Live Photo Gallery have good stitch features.
It's been working well and I can get close to 6X17 with two properly overlapped 6X9's, and close to 6X24 with three.
And, I'm doing this with a less than $500 camera.
Off on a tangent.... Portra has a nice range to 80... (