I wouldn't have thought that say a 10 times enlargement would give any problems in terms of quality. This is only the equivalent of enlarging a 35mm neg to a print size of 24cms by 36 cms or about 9 inches by 14 inches in the imperial measurement system. Most slow 35mm film developed in a fine grain developer would still be OK at an enlargement of 10 times without grain being a problem.
Originally Posted by Sergey_Shablovsky
I still have difficulty thinking in centimetres. Those of us in N America or the UK who are now middle-aged are more used to thinking in inches.