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Save an extra 20% off your entire order with coupon code: May20
*May exclude certain brands.
**May not be combined with any other offer.
Code expires 5/23/13
Looking through the scope turn the objective rim counterclockwise to open the TWIST CAP™ diaphragm and clockwise to close it. To control brightness, adjust the objective diaphragm to eliminate extra glare or unwanted light. Both diaphragms, once closed, serve as dust covers and lens protection.