Stupid question.....

[Gene_SC]

LOL Dave... Even the drug store cheaters could never help me.. I tried all of em and still could not see.. Finally about 8 years ago I had two ripe cataracts and had the surgery which actually improved my vision to the point that I could read street signs while driving with out glasses.. But I do wear them and they are like Dano's. Bifocals..

Gene

Then I got curious about how good my range estimations were...well, let's just say I use a 300' surveyors tape measure now. An antique my Dad has, but still functional, and much better than my "guestimations."

[3n00n]

Those old school surveyor chains are amazingly accurate when used in conjuction with the correction tables.:emoticon:

[roadrnnr42]

Dano, where is TX do you live. I am looking for another air gunner to shoot with. At a true 50yds I am lucky to get a 3" grouping with 5 shots. I have decided that if I can hit a coke can somewhere close to the middle of it at 50yds. I am doing good.  
I have access to 50 ac. just north of Denton, Several thousand in west Texas. Once in a while it is fun to go out and do some night hunting. Get everything from rattlers, skunks, rabbit and raccoon.  During the day we go to one of the tanks and look for turtles. What a sound when you nail one.

[3n00n]

Paintballs on golf tees are in trouble when I get the FWB 300 out. Not so much so with glass, since it looks like I'm surfing whilst me eye is attached to a telescope . . .

unlessit's rested ona bipod of course, as that eliminates that 'ocean' effect of the telescope:p

[Black Mamba]

I actually do measure any kill shots I take.  I have the time and always have had the inclination so me and the oldest get out the measuring rope (marked in 5 yd increments) and check out each shot.

I have already measured pretty much every single landmark within 60 yards of my porch.  It really helps when I'm shooting at either targets or critters because I already have a good idea of how far away they are, where ever they are.

Then again, I also measure ALL my pellets and put them in fishing lure containers by .1grain separations.....

[DanoInTx]

I agree, I can shoot real well with a match sight.  I completey understand the 'ocean' effect, I watch that little bullseye float along like it's surfing a wave.  If I turn the mag down to about 4x it helps, but with open sights it isn't there at all.  I almost shoot by intuition through open sights, whereas scoped guns make me a little more tense and 'aware' of my technique, not as fluid.

[3n00n]

I have some nice 1x glass that still "float" more thanaperture or blade. I've looked at somelight wavelength formulae and realized I don't know enough about the composition of that glass to determine compression values.

`

Straight reflex systems seem to"float" slightlyless than red dots or single power scopes, butwhen thesurface finishquality isn't high enough, thendistortions in the glassitself create a less than repeatable optical path to the eye.

`

Something else interesting about glass optics is the "depth of field" generated through the eye lens by the ocular aperture, which could cause the eye lens to "force focus" on an optical plane not aligned with the reticule distance. I have to be aware of my reticule focus to try to avoid that DOF parallax complication.

`

Decades of precision high grade optics have probably spoiled me some also, since Wild and Leica have some of the highest grade Swiss glass made inside ofthier instruments.

[DanoInTx]

Haha, J, I am completely lost when it comes to "Optical Compression" and "Rocket Science"...., but you are probably right, or I should say if I had any clue what you were talking about you'd still sound much smarter than me:)

[3n00n]

Like what ice is, only they're specializedsilicates that melt at higher temperatures. When you look at something in water, through the waters surface, the lightwaves "bend" from movingat a different speed.

`

Glass does the same thing, so the curves ground into the surface "adjust"how much the light bends. Compression is the distortion caused at the edges or surfaceof the curves that generates "canceling" interferance that reduces the transmission value.

`

Most rifle scope transmission values arelow 90%, and that difference is something that the lens inside of the eye may attempt to correct for. Especially tough on the eyewhen the focal distanceto the reticule is different than tothe target object. It can give ya a headache pretty quick too,if your eye lens rapidly tries to focusto both distances at the same time.

[DanoInTx]

Did you know that in older buildings the thickness of the glass is thicker at the bottom of the pane compared to the top?  Glass flows just like water, it is however very viscous at most normal temperatures.

[3n00n]

Thicker at the placegravity makes itflow to, so makes me think you'd want to store your scopes cold and turn them every so often . . .

[DanoInTx]

3n00n - 2/23/2008  9:09 PM

Thicker at the place gravity makes it flow to, so makes me think you'd want to store your scopes cold and turn them every so often . . .

Why are you laughing, I thought everybody woke up every 2 hours to rotate their scopes....don't you?  I do it with my springers too, to keep the lube evenly distributed:)

[3n00n]

So, since I haveall glass nowplaced inthe large walk in freezer inside ofthe anti-gravity chamber, it takes me a little while to put on the magnetic boots andthermal suit.

`

Can't be to careful, ya know . . .