Originally posted by tuco I have the SMC Pentax 67 55mm generation and really like it too.
I import a TIFF-DNG scan to Lightroom, perform initial exposure adjustments there, export that to Photoshop with Lightroom rendering to use Photoshop's healing tool, make any local adjustments if necessary, return to Lightroom where I may crop/level/further adjust the shot and perform sharpening there. If you hold down the option key (Mac) while setting radius, detail and masking you get a nice aid to that. This is all done at scan size and then I just export to screen display with longest dimension as 1024 with either standard or high sharpening option.
Interesting! I'm on a Mac also, but I don't use LR. I simply open the TIFF files in ACR to tweak colors, contrast and apply a bit of NR if needed. I also make an initial sharpening, because ACR does it better than unsharp mask. That's pretty funny, because when I process RAW files from my D700 I hate the ACR sharpening and do it in PS instead.
Then I import the image to PS where I downsample and sharpen the image in 2-3 steps. Still I don't get that crispness that you do, but I suppose it's because I haven't found the right parameters for each step yet.
I just scanned my first roll of Portra 400 that I shot with the 55/4. I think I underdeveloped it a bit (probably too low temperature), because the negs are a bit thin and the colors were off. But with some tweaking it came out quite nice.
The lens seems to handle counterlight pretty well, but I had one other frame ruined with a nasty, red flare blob. CA is low but there's some fringing around highlights.