Alternatively , the lens adapters would include optical elements and act as weak teleconverters , as well as possibly losing optical quality .
For other lens types , an adapter would act as an extension tube , causing the lens to lose the ability to focus to infinity .
The lens adapters would include optical elements and act as weak teleconverters , as well as possibly losing optical quality .
For other lens types , an adapter would act as an extension tube , causing the lens to lose the ability to focus to infinity .