Some people call it Adjustable Objective. Sooooo, if I can find the focal length of the scope I want, and I can have the parallax adjusted to any distance I want at the factory, I can figure out a distance that would be in the middle of the range I'd like to shoot. GY6 Vids does a great job explaining what Parallax Adjustment is. So how far is the image from the lens when the target is at 50 m? 100 m? 150 m? Moving the objective lens relative to the scope body makes no essential change in the value of the variable, O. Tom Beckstrand provides all of the necessary steps to get the best cla. What I'd like to know is how far we'd have to bring the objective lens in if we shift the parallax correction from 50 m to 100 m. An overview of focusing your reticle, setting up your diopter, and adjusting parallax. Our method also employs a variation of spatially-varying warpingmethod, but only uses it to align input imagesover a local overlappingregion. However, they still cannot handle images with large parallax, as shown in Figure 1. The formula for the distances from a lens of the object and the image of that lens is: to work well on images with parallax that are difcult for homography-based methods. Now can we calculate? Oh, goodie! On a short scope, the objective's focal length must be around 0.1 m considering that there is an erector lens in that tube also.

Parallax adjustment