FYI - The appeal to Promaster in my opinion is that it is indeed a quality product that the manufacturer stands behind. But, not every retailer wants to carry the product because repair or warranty work is handled on the spot, in the store.. Meaning, if my unit breaks, I return it to the store for a replacement and THEY have to deal with the manufacturer.
Go here..
Promaster Look at what they offer. And, look closely at the LENSES they offer

For example - Does this look familiar????
