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Posted: 3/24/2008 5:07:19 AM EDT
| Is this available on any scopes? If so, what is the feature called? |
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On a microscope, the description you gave would be called an "infinity corrected" microscope. Very very expensive. For a riflescope, I know of a very poorly designed scope that has a front end adjustable objective that is practically that way by accident. That's a little industry humor.  For a riflescope it would be a very expensive proposition especially since for every scope that is sold retail for about $500, there are 42 scopes that are sold for $200 or less. I'm going to guess that you might be using a scope with an adjustable objective and when you change power up, the image is out of focus? That's normal actually. The term "depth of field" is a range of acceptable focus for a particular diopter value. (That's what you're changing when you turn the power selector ring.) Low power values have long depths of field and high power values have short depths of field. The best thing to do is to focus on the highest power you can to shorten the depth of field and then go to the lower power. If you tend to shoot at the same distances, focus using the highest power you have at that distance and mark the scale. From then on, you'll always be at the best possible focus at that distance. |
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Millet has those ones that have a focus knob out on the left side directly across from the windage knob. Its called the "Side Focus Scope" (never woulda figured out that name huh? Its supposed to allow you to focus after changing magnification without having to lift your head and lose your target Millet scopes CLICKY There was a guy in the EE that was selling these things for a lot less than the list price. Do a search in the optics section of EE for Millett and you should find them. |
Okay, then assuming your scope has its focus fixed at 100 yards, this means you should have very crisp focus at 100 yards, plus the range of acceptable focus can be a range from 50 yards to 150 yards. If you have some time, do the following, please: 1. focus the eye piece to the reticle by looking at a blank wall, or the sky away from the sun, and looking at the reticle, turning the eye piece (if it is the locking ring type) or if you have a European speed focus, eye guard until the reticle is in focus. It's best to look at the reticle, turn the piece and look away and repeat. Your brain will try and focus on the reticle by causing the muscles around your eye to contract squishing the eye ball for focus. You don't want that. You want to find the focus with your eye muscles relaxed. 2. After you achieve focus on the reticle, take the scope to a place where 100 yards distance is either marked or can be found. Put the power selector ring to the highest power you have and check the focus. It should be very crisp and clear. If that is the case, then turn the selector ring to the lowest power. It should also have a crisp and clear focus. If you lose focus at 100 yards for a fixed focus scope, then it's time to return it to where it was purchased. Let us know how it works for you. |
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