I think we've been through this before...
At the risk of being labelled as terribly sad (again) for the lengths I go to to get the best from these scanners ( I'm not one for doing things by halves... and I'm certainly not one for relying on "defaults" )....
In setting up the Epson for my comparison, I went above and beyond what most people would bother trying. First the obvious things like flipping the risers around was easy, yes it does help, but not by much, and will vary from scanner to scanner.
Second was the wet-mount system. When the transparencies are mounted in fluid their transmissive quality increases noticeably, it also fills in scratches and reduces visible grain, this along with the fact it eliminates Newton rings is why wet-mounting is done for most high end scanning. Wet mounting to glass for flatbeds also ensures that the film is totally flat, which is very hard to achieve in the supplied holder. I used the Epson wet-mount adaptor, and wasn't that impressed by the results, so I then fluid mounted the transparency to the
underside of the adaptor, therefore removing the extra glass from the path between film and sensor. I then used a series of shims from 0.5mm to 2.0mm to work out the optimum focus point on the Epson ( mine was 1.75mm ) and tried again. Basically, the Epson was given
every opportunity to shine, to perform to the optimum of it's ability, I can't think of any other advantage I could have given, if anyone else can think of something which would have improved the sharpness of the scans, I'd be glad to hear of it.
Remember also that the V750 has better optics than the V700, which aside from bundled software is pretty much the only difference between them and supposedly where the extra 200 quid goes.
What I discovered was that ( unlike the 4990 ) there wasn't such a huge difference between the dry scan in the holder, and the wet-mounted scan ( even with the enhanced method ). Yes it was slightly sharper and clearer, but there wasn't a huge amount in it, which means the improved holders for the V700/750 are much better than the 4990 ones I tested before.
The scan in my comparison that I posted here was done dry in the holder. I do have others using the wet mount methods described above, but the difference is just as apparent.
Adjusting the Gamma in the scanner software will just apply a different software translation curve to the data that's received from the hardware, it's identical to opening the scan in Photoshop and moving the middle (gamma) point in the Levels tool. You're effectively just altering the data, it won't make the hardware see any more shadow detail, just make the shadow detail it did pick up appear lighter.
In light of Joanna's generous offer to do a scan for Chipper, I'll reciprocate. Joanna if you would like to scan a chrome of your choice with your V700 and post it to me, I'll do you a drum scan and send it back with disc, then you can compare for yourself. If nothing else it will be an interesting comparison for you, and will also give you the opportunity to print the drum scan with your system and decide if you can see the extra detail, I know on mine the fine detail is incredible with the drum scans.