Vortex Defender E-10 Flip Cap

Item No. 87587400587


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Product Description


The Vortex® Defender Flip Cap Eyepiece adds more protection to your optics lenses and is virtually indestructible. Compatible with nearly all Vortex® optics, this flip cap fits your optic securely and features a snap flat spring that will keep your line of sight clear. With three stop positions, the Vortex® Defender Flip Cap Eyepiece is designed for versatility and precision. The stop positions include vertical, 45-degrees, and 90-degrees. Try the Vortex® Defender Flip Cap Eyepiece during hunting season. 

The E-10 fits all Vortex Riflescopes except the 1-inch tube Viper model VPR-M-01BDC, VPR-M-04BDC and VPR-M-03BDC. Outside diameter: 41.5-46 mm | 1.6-1.8 inches


  • Durable design 
  • Line of sight stays clear
  • 3 stop positions: vertical, 45-degrees, and 90-degrees
  • Tube Diameter: 1 in. 
  • Outside Diameter: 41.5 to 46mm

Customer Reviews

3.9 / 5.0
29 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I bought this and slipped it on, seems to work fine, have a 4x12x40 diamondback scope. Will know more as I go the range and hunting season comes around.
May 31, 2020
Originally posted at
Defender Eyepiece Cover
I bought this for my 2-7x32 Crossfire II Rimfire scope, when I went to put it on, it seemed to small. The flexible rubber body allowed it to fit, but with some coaxing. I'm assuming that it was engineered that way.

Overall, it's a great product and does what it should. It's pretty quiet when opening and closing, there's no plastic on plastic slapping sound like the other brand of scope cap. The flexible rubber body allowed for a tight fit.

Only giving the product 4 stars because it just seems too small for the application.
April 9, 2020
Originally posted at
Like other reviews
This does not fit the ranger series. Like others have said it's a very loose fit and requires 2 hand operation to open. Wish I could like it.
January 9, 2020
Originally posted at
Durable and very helpful for all my scopes. I will continue to buy these.
January 3, 2020
Originally posted at
Bought this for my Viper HS 4-16x44. Needless to say it fits so loosely that when you go to open the cap you end up pulling the cap off the scope. Guess I'll be going back to the cheap Butler Creek covers. Those are junk too but at least they stay on the scope.
October 10, 2019
Originally posted at
Crossfire ll 3-9x40
This cap is the right fit for the Crossfire ll 3-9x40. ( Thanks Ryan Muckenhirn @Vortex Optics Sales) I almost ordered the wrong one. I will come back with a review during the season and significant weather change. I can see where the material use to allow it to fit, may or may not expand during weather change. But I've read on here that they will send you and adhesive that won't leave a residue on your scope. So for that, it's fit, look and easy to install, I give it a Five Star rating.
July 26, 2019
Originally posted at
Great flip caps
Have been using them for 3 years and I’m very impressed with the performance. Couldn’t be happier
May 28, 2019
Originally posted at
Great cap
I’ve had mine for over a year now and love it. Now I haven’t put it through crazy conditions but it does have a great build quality and I believe it would stand up to some serious conditions. Easy to install and look great.
May 28, 2019
Originally posted at
Best I’ve found
Does the job, fits tight, quality product. Best I’ve found.
May 28, 2019
Originally posted at
Worth it!
Initially they seem pretty expensive for caps, but they work great. Leaps and bounds better than butler creek. Tight fit with a bit of electrical tape on my swfa scope. They close and open easily. Wont use any other caps now.
May 13, 2019
Originally posted at