Which IT8 profile to get?

[bluesky1]

I am new to scanning, and have a brand new Epson V850 which I will use for archiving old family photos (and some negatives). I understand it's important to calibrate the scanner, so I am going to upgrade to Ai Studio for the auto calibration feature and get an IT8 profile. Question is, which profile to get? My prints are from many sources, some as old as the 1940s and earlier, others relatively recent. LaserSoft sells the following reflective targets:

reflective Fuji Calibration Target 10x15 cm USD 49,90
reflective Kodak Calibration Target 10x15 cm USD 59,90
reflective Kodak Calibration Target 13x18 cm (5x7") USD 69,90
reflective Fuji Calibration Target 13x18 cm (5x7") USD 59,90
reflective Kodak Calibration Target Full format 15x22 cm USD 109,90

On the website when I upgrade Silverfast, some of these options go away in their "recommended" list.

If my goal is highest quality scans for my old photos, which target should I get? Or does it not matter, given my prints are from many sources?

Also, I assume if I scan negatives I should get a separate target? Any recommendations there? I have a few larger older negatives I will be scanning. The choices that come up when I upgrade Silverfast are as follows:

transparency Fuji Calibration Target 35 mm USD 69,90
transparency Kodak Calibration Target 6x7 cm (price on request)
transparency Fuji Calibration Target 6x7 cm USD 99,90
transparency Fuji Calibration Target 10,2x12,7 cm (4x5") USD 109,90

Thanks!

[LSI_Ketelhohn]

Dear customer,

The IT8 calibration is a device calibration. The material given is only the material the target was produced on. It is not related to the material you are going to scan.

The size mainly matters in regards to the scan area your scanner and the handling of the target. Some scanners have a limited scan area. Larger targets are easier to handle and can compensate better for single dust particles on the target.

Kind regards,
Arne