FFP against SFP Scopes.?

[angrybear]

I have a question please.

I have a sfp scope and it is zeroed to 40 yds if I shoot at 30yds or 50yds I need to take into account mil Dots up or down to be on target.

If I get a FFP scope will I still need to do the same mildot adjustment to be on target or will it be on target if I zoom in at 50 and zoom out at 30??

Is it just the recital that changes??

The POA of the centre + act exactly the same way on both FFP & SFP.

What changes is how the scope substrates (be they mil-dots, milrads, or random marks), act when you change magnification.

With SFP the image gets bigger with more mag but the ret stays the same size so 1 dot holdover at 4x moves the POI 4 times as much as 1 dot holdover at 16x.
Because of this, the SFP Mil-Dot is only "true" as a unit of measurement, at 1 specific level of magnification, usually 10x but sometimes 20x on higher mag scopes.

With FFP the image and the ret change size together, so 1 dot holdover at 4x is the same as 1 dot holdover at 16x.

see here; 4x FFP is slightly off because the ret is pretty small but then I don't usually use 4x at 25yds

https://ibb.co/QPdQQ5W
https://ibb.co/s3P2nyW