Search results

March 36x55 EP-ZOOM In answer to the OP first question - yes the eyepiece has the usual focus (diopter) correction in addition to the zoom adjust. An old reference from the original Deon Optical site said that the 36x55 EP-ZOOM was based on the 50x fixed with the new eyepiece. Having both I...

Diffraction Limit Based Calculation Note: A 6mm diameter bullet hole at 1000 yard is a Bullet Hole Diameter of 0.0232MOA. To resolve - that is be able to see that two 50% overlapping 6 mm bullet holes are in fact two holes and not just one - you would need: Minimum Magnification...

$$$ versus Quality Dennis, As long as we've highjacked this thread... The diffraction limit of resolution by objective diameter is only usefull as a comparison for as I stated "very similar" quality scopes. The other limitation on resolution is how well the scope design (glass quality...

I think you are confusing light gathering and resolving. Light gathering and resolution (Britannica.com) Light-gathering power: This capacity is strictly a function of the diameter of the clear objective—that is, the aperture—of the telescope. Comparisons of different-sized apertures for...

better resolution Scope resolution is limited by and is proportional to objective diameter. Assuming quality to be very similar, the 60 mm spotter will provide 33% better resolution than the 45 mm scope (60/45 = 1.33).

Boyd, Please don't let Tim ? get to you. All the regulars here know enough of your history and qualifications so that we at least respect even if we do or do not agree with your opinions and suggestions. Tim ? on the other hand is not know to us as to his qualifications or agenda. I'll also...

Heresy? Brian, You are not alone in the commission of this particular "heresy". After about 50 years of using the "kosher" technique (adjust eyepiece first then parallax) I also discovered and began using the method you described. I find that the heretical technique you described works more...

See attached

Futher Update When I first posted this information and again when doing the update, I had hoped to elicit replies from expert metallurgists and to initiate a useful discussion. I've received some email responses and also some replies from experts from "back in the day" to messages that I sent...

Cartridge Case Ref. Info Update The following data is offered for discussion and consideration. I'm not a expert in metallurgy or annealing so I'll refrain from interpreting the data. The cases were re-tested (post instrument calibration) and a Lapua "Blue Box" was added - note the difference...

From a physics of optics stand point you might find this calculator helpful: http://www.twincityrodandgun.com/Bullet%20Hole%20Res%20Req/Bullet%20Hole%20Res%20Req.htm However, the combination of air pollution, thermal, and wind effects popularly known as "mirage" will usually dictate the...

So far 22 of 22 HVR Jewell trigers I've purchased and installed for myself and others came with the "A" (8 to 48 oz. approximately) installed.

Nat, Yes Crucible Materials Corp. filled for bankruptcy May 6, 2009 and shut down shortly there after. The Syracuse operations were purchased and reopened as Crucible Industries LLC on November 18, 2009 with the former products becoming available based on the demand. They announced a 3%...

Jackie, When I was doing my research on barrel steel I was focused on stainless steels but did not find any other case of attention to the end use and consistency of quality focus as Crucible's 416R reported by the barrel makers I spoke to. I only found one maker that had experimented with 410...

Optimization of steel for barrel blanks goes well beyond basic alloy selection and includes such key features as maintenance of homogeneous micro-structure, precision straightening and precision stress relieved bars. Also key is maintaining process control to provide consistent quality from lot...

Check this one also: http://www.gaugemate.com/rangemate.htm. Not as elegant as the Sinclair. However, I have and use both and find the RangeMate clamps more securely to a broader range of bench thicknesses and bench top materials.

Bob, I can't claim to "know" but a couple years ago I did an experiment on two factory 22-250 barrels with loads using RL15 and R10x. At least on those two the lands eroded away (first bullet contact further toward muzzle) just under twice as fast with the faster RL10x than with the slower...

You may find this thread pertinent: http://www.accurateshooter.com/forum/index.php/topic,2645785.0.html

As of October 17th Geddes (WSYR-TV) - Crucible Steel workers are expected to be back on the job in the next two weeks. Wednesday, the United Steelworkers union held an informative meeting detailing the specifics of the deal presented by the plant's new owner, JP Industries. Union...

This thread may be the one your refering to: http://www.benchrest.com/forums/showthread.php?t=56123&highlight=centering+scope+adjustments