Recently I was literally between a rock and a hard place when photographying a waterfall. I was barely able to make the photo. Not only was my 90 mm f/8 lens a bit too long for my close proximity to the falls (moving wasn't an option although a 75mm lens might have been just the ticket), but I was more disappointed in how relatively dark the gg appeared when trying to focus - and that's with a new Satin Snow glass and a 4x loupe.
I' m considering replacing this lens with a faster lens of the same focal length if that would significantly brighten the image on the gg. Newbie question for you seasoned LFers: would the same length lens in an f/5.6 or 4.5 give me a noticeably brighter view for focusing?
If so, I'll have a beautiful Fujinon lens for sale very soon.