The Rectifi Blog (Sort Of)

Pardon the dust. While I figure out a real blog layout, here are some ramblings and guides I've wanted to share.

The Flex Rule: How PSA Grades Centering on 2025 Topps Chrome

Data from 104 PSA slabs reveals the flex rule: PSA accepts either L/R reference on 2025 Topps Chrome, and T/B is where cards actually get separated.

The 52/48 Rule: What BGS Centering Subgrades Actually Require

52/48 is the front threshold. Data from 155 BGS-graded slabs on what actually separates a Centering 10, 9.5, and 9.

How to Check Card Centering — A Complete Guide

A comprehensive guide on measuring centering ratios correctly, the impact of camera angle distortion, and the specific centering requirements for PSA, BGS, and CGC.

The Story Behind Rectifi

Why I built a perspective-correcting centering app, the math behind defeating optical distortion, and how it level sets the playing field for buyers and submitters.