I got my lens set for Bernina 440 last year as I noticed that I was slouching more to see what I was sewing. They cost me about $45 (reg $60) for a set of three but so far I have not needed the 2 higher magnifacation lenses. They do need to be put on by your Bernina technician so I bought them when my dealer had 25% off B accesories and waiting until my machine needed a check up so I got it all done at once.