I picked up an accessory close-up lens set for my Yashica-Mat recently. To my surprise, I managed to misframe all the shots on the first roll of film I put through the camera using the new lenses.
I had assumed that I would need to aim high to get the image properly centered as I do with my Mamiya C330. However, it turns out that the Yashica close-up viewing lens is constructed to automatically compensate for parallax error. So, the Yashica-Mat is actually somewhat easier to use than the C330 which really requires the Paramender on a tripod to properly capture the image on film as it is seen in the viewfinder. Close-ups with the Yashica-Mat also do not require any exposure compensation as is the case when the C330 bellows is cranked out for close shots.
A tripod is actually a good idea with both cameras as depth of focus at close distances is very narrow.
These two shots were made with the normal 80mm lens which provides greater DOF.