i have and use this same lens ...
it has ample coverage for 5x7, and who knows, maybe 8x10 ...
i say that because allegedly the guy i bought it from
used on his 8x10 camera ... i say allegedly because i haven't tested the image circle
to see how dim the edges are ... he sold it to me on an 8x10 board, probably used it for macro ..

sweet lens !
( and a HUGE DEAL at this price ! )
john