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henrya, Re: "I like seeing that your calculated Dawes limit resolution and the measured resolution correlated so closely and I bet you did too." We were not at all supprised by the correlation between the calculated Dawes Resolution Limit and the measured resolution limit. My associates and I...

Diffraction Effects Again based on an email question I've put together a document with illustrations to help explain diffraction cause and effects.

Shim Thickness Calculator You might find this calculator helpfull: http://www.twincityrodandgun.com/Sight%20Calc/SightCorrectionCalc.htm

Resolution Definition Clarification Based on an email question, I am apparently confusing some or at least not being sufficiently clear about the meaning of resolution as I've been using the term. Perhaps the illustration below will help. At the top is a pair of bars (lines) as they would be...

Mustafa, Remember that the testing was a trial to see if we could find meaningful ways to due comparative testing. In that the work was as much to establish procedures and methods as to collect data. Also note that we chose to examine only resolution limits and color impact on resolution. For...

Back to the Reducer Ring Function henrya, We expend a lot of effort in researching, discussing, testing and comparing the relative quality/merits of the various telescopic sight designs and manufactures in our quest for the best performance possible. This is all well and good but it tends to...

Resolution Test Data in LP/mm henrya, I’ll answer your last two queries in reverse order. First, yes we did get the measured results for resolution in line pairs per mm (LP/mm) and a summary is shown below (before you have to ask – I inferred that would be your next question). The way the...

Scope Testing henrya, 1. We have tested the resolution of several popular target scopes using a resolution test target both by visual observation and using a digital imager. The scopes tested were: Weaver T-36, Leupold Competition 40x, Leupold Competition 45x, March 40x, March 50x, March 60x...

Promised Response To avoid a lot of typo errors, I did the response off line and attached it here as a PDF file. Mustafa, For the last few months I've been trying to put together an imaging setup to use digital images of the scope image rather than human eyes to assess scope performance. Even...

Guys, Sorry for the delay in my promised response. It is proving to be more difficult than I anticipated to avoid being too technical and even more difficult to be brief. I will finish and post tomorrow afternoon.

High end scope image quality perception Hovis, Mustafa, Bob I'll try to put together something on this topic since you have all asked. Maybe I can even do it without too much technical diversion and brief enough to avoid being boring. Jackie, Loved your post this morning. Based on your...

Hovis There are many tests on scope performance that we all can run with a little knowledge. Most of the more important ones do require some very specific tools and equipment to do with precision. Some can be done with home-made gear that will produce useful but not very repeatable (differences...

kbbgood Let me start by saying that I have 6 Weaver T-36s and have never had one fail. On a performance for the buck basis they are the best starter target scopes. I have shot both 600 and 1000 yard matches with Weaver T-36s and not been at the bottom of pack. They are marginal at 600 yards...

Aperture Reduction Caution Before the enthusiasm for using the March Modifier Disk or any other aperture reduction gets out of hand please remember that with the potential benefits there are also some performance sacrifices. Attached is chart (PDF format) that shows key performance parameters...

The item in question is provided with the March scopes which they call a Modifier Disk. It is a thin disk with a 35 mm hole and is equipt with a threaded mounting ring that fits the objective end of the scope. When in place, it will: Reduce light through the scope 50-55%. -- This may be usefull...

El Paso Mark, Your posted shot is actually fairly good for your camera. You managed to get the scope image in useable focus and good exposure. Such shots don't need to be "trial and error" as there is some science involved to help the setup. However, you can often get a useful shot faster by...

Mark, I’ll try not to get too technical, but there are several very important concepts that come into play when trying to use your type of camera with a telescopic sight. If you already understand these please note my terminology. The technique you are attempting substitutes your camera and...

Tiny, I am and always have been left eye dominant but have always shot right handed using my right eye (except for open sight pistol which I shoot right handed but sight with my left eye). For trap shooting I have to wear an eye patch or opaque lens over my left eye. I can shoot open sight...

Mark, It would help a lot in providing a useful response if you would provide some more details: What type of camera do you have (SLR, or fixed/built-in lens)? Available lenses/specs if removable or optic zoom range if built in. Size of imager (H x W in) and pixels (typically given in Mega...

Lou, On the back end you might try a shooters cap. See http://www.championshooters.com/hats-ssl.htm Or my favorite for realy bad sun at the bench is the Dvorak Soft-Eye. See http://www.dvorakinstruments.com/scope.htm