without knowing more than you've written...did you have the bellows out? It's an RB67 right? I use to have one and it took a few goes to remember to compensate, in spite of it being written on the camera! Or a filter?
By the bellows, I'm assuming you are referring to the focusing bellows. Almost all of my shots were made at infinity since I was shooting landscapes. Do you have to compensate for the focusing bellows when close focussing though? I was not aware of that if I am. I took one macro(ish) shot with Velvia 100 and is was properly exposed and is one of the pictures that I am getting scanned. I did waste a roll and a half of film because I forgot to readjust the exposure compensation on the Sekonic after removing a filter.
The film was processed in Xtol from the lab that handles all of my printing and developing. I trust the lab knows how to process this stuff since their livelyhood is a fine art film/reproduction/printing lab that specializes in black and white photography. I did adjust the exposure for the filters per the recommendations. My first shot made of a subject was an averaged reading from the Sekonic L 358 then I would bracket 2 or 3 exposures from there towards overexposed. I used the same technique with the Velvia 100 and Velvia 50. With the transparency film, the metered shot was the keeper and the others were generally overexposed. With the Ilford pan F, all of the shots were underexposed. I bought the film a month or two ago from B&H or Adorama and kept them in he fridge until I had the chance to use them. I hadn't had a chance to send any film through the camera until now. I bought the camera in Korea and I haven't found a way to process film there so I have no real experience with the camera or film for that matter. Film photography is new ground for me.
I have a couple rolls left that I will probably shoot without any filters to eliminate that variable. I'll probably set the ISO to 32 or 25 as well and bracket from there and see what I end up with. I only have one week left until I have to return to Korea so my time is running out to play with that.
Overall, I'm very happy with the results so far especially with the blues and greens I saw in Yosemite. I'm excited to see the scans. I'm getting hi-res 50mb scans done of two and economy hi-res scans done of the rest. I will have to play around with black and white a lot more to get the results that I am after. I bought the camera to shoot black and white almost exclusively but so far I am blown away with the color. ...at least what I see looking through the light box and a loupe.
Thanks for all of the help and the replies. This is a bit of a learning curve for me but it's exciting too. The Mamiya is a blast to use as well!
Marty