Thank you for your inquiry on the EF 24-104/4L lens. We value you as a
Canon customer and appreciate the opportunity to assist you.
We are aware of a flare issue that is beyond an acceptable level.
Because of this problem, we have stopped shipment to dealers. However,
some of the units unfortunately have shipped out already. Canon will
repair this issue at no charge.
Parts are not yet available to correct this issue. We expect to have
parts available at our Factory Service Centers by November 17th.
For further assistance please call our Canon Pre-sales Department at
1(800)652-2666 between 8:00 am and midnight ET, seven days a week. The
Pre-sales agents will assist you with product information and dealer
locations.