PSA Qualifiers and Price Impact

I am somewhat new to the grading world but not completely clueless. I have a question about the impact of a qualifier and the SMR value. Is it fair to say that a qualifier would knock down the PSA number by one? And does it depend on the qualifier? (Ex: ST vs. OC). For example, if there is a PSA 8 OC Banks can I reasonably assume it's SMR value is near that of a 7? Thanks for your input.
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A PSA 8 ST or OC would be a straight 6 or so without quilifiers
Always looking for Chipper Jones cards.
Im a very focused collector of cards from 1909 - 2012...LOL
Doug
Liquidating my collection for the 3rd and final time. Time for others to enjoy what I have enjoyed over the last several decades. Money could be put to better use.
They are best avoided.
So a minimum 2 grade drop would be more accurate.
In regards to SMR value, SMR is theoretical. A better gauge of value would be via actual open market realized prices, using a service such as vintagecardprices.com
Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
on the severity of the OC a card could get a VG 4 or 9OC.
Depending on the card it some cases I prefer the qualifier.
Steve