i have a 4x5 sinar P........and an cannon 350D... only 8megapixals..........is ther an attachment that will allow me to mount the cannon onto the sinar rear base?[ without the frame holder or back}...... i just want to use the sinar rear standard to be precise about taking a few frames to put together in photoshop....?.......the homemade adaptor mention in another thread would work ... but i don't really want to carry the whole sinar camera around with me... thanks G