Leupold Alumina Thrd 50 Ft. Focus Adapter question

[peaceful_ruler]

hello! 

I own several Leupold scopes with AO that focus down to about 25 yards. I recently came across this focus adapter that is available for 40 mm objectives that apparently allows focusing to closer distances on post-2004 scopes. Does anyone have any experience with this adapter? Thank you!

 

[peaceful_ruler]

Have you tried Amazon, I’m pretty sure I saw some there.

 

[oldsparky]

I bought one a few years ago. It works well, I used a Leupold scope that the near Parallax was 25 meters. Screwing the adapter on I could use the scope at 10 meters. Back then the best price I could find was link bellow. The only reason I don't use it more is because my Leupold scopes are either duplex or dot reticles. For an air gun I prefer multiple aiming points so I can have an quick aiming point for our rainbow trajectory.



https://grabagun.com/leupold-stevens-inc-59021-alumina-threaded-50-ft-focus.html 

 

[peaceful_ruler]

Does it just screw on to the objective end or do you have to remove and replace the objective bell?

 

[Guest]

I have a 50-foot adapter on a Mark AR 4-12x40 AO mildot. My primary purpose is barn work, where shots range from 20 to 40 feet on mice. Without the adapter, the image is fuzzy, and the radical floats around the target with the slightest movement. It works well out to 30 yards; then the image gets glassy. 

Screws on the end, just like all other Aluma accessories.

 

[peaceful_ruler]

I have a 50-foot adapter on a Mark AR 4-12x40 AO mildot. My primary purpose is barn work, where shots range from 20 to 40 feet on mice. Without the adapter, the image is fuzzy, and the radical floats around the target with the slightest movement. It works well out to 30 yards; then the image gets glassy. 

Screws on the end, just like all other Aluma accessories.

Nice. Does the AO still function correctly on the scope? With the adapter installed can you still focus at all distances? I also want this for my Mark AR Mod 1 scope.

 

[Guest]

No, the parelex (AO) is canceled by the adapter. 

 

[c_m_shooter]

The focus still works, but you will have a much smaller range. If your scope normally focuses down to 25, you will get from about 10-40 yards will the adaptor on. I have a couple scopes that only focus down to about 12, and I use the leupold adaptor to get my ranging done on the short field targets. It doesn't fit those scopes properly, so I don't actually shoot with it on.

 

[peaceful_ruler]

The focus still works, but you will have a much smaller range. If your scope normally focuses down to 25, you will get from about 10-40 yards will the adaptor on. I have a couple scopes that only focus down to about 12, and I use the leupold adaptor to get my ranging done on the short field targets. It doesn't fit those scopes properly, so I don't actually shoot with it on.

I’m trying to figure out how this adapter functions. Does it have a lens that focuses closer? Does it also change parallax?

 

[c_m_shooter]

It adjusts the parallax and focus closer at the expense of long range focus and parallax. There is only one lens in it, it is some kind of black magic as far as I can tell.... You can put it on and take it off without effecting zero, and I have shot just holding it over the front of the scope on scopes it did not thread into.

 

[Guest]

The lens works like a pair of reading glasses for someone far-sighted by changing the plane of focus from far to near.