Get
SDSS
Cut Out
Image

ra deg
dec  deg
zoom       [-5..0..5]
pixels per degree

 ppd
  (9088 == 1:1)
      range is
100 ... 1,000,000
width pixels
height pixels

Grid
PhotoObjs
SpecObjs
Invert Image

There are also HTTP and SOAP interfaces to this web service. See:
SdssCutout.asmx?WSDL
A brief description of the service and its parameters is at: intro.