ACOG reticle focus??

[Artos]

The right side of my target reference on my ta31rco will not come into focus. The manual says this is normal due to the design.

Does anyone undersand the reasoning?? I'm Just curious.

thanks.

[JSantoro]

You already answered your own question. The reasoning behind the manual mentioning it is that...it's normal.

If you look at every single TA31 RCO variant out there, you'll note that the right side of the mil-scale is slightly blurry. Ergo, they mention it in the manual so that folks wouldn't think that their optic was all dorked up. It's still completely usable.

But, since so few people RTFM, people still wail and tear at their clothes when they find it in the FOV. Next to the FSB blur, it's the second-biggest non-issue regarding the ACOG RCO series.

[Pro2AInPA]

You already answered your own question. The reasoning behind the manual mentioning it is that...it's normal.

If you look at every single TA31 RCO variant out there, you'll note that the right side of the mil-scale is slightly blurry. Ergo, they mention it in the manual so that folks wouldn't think that their optic was all dorked up. It's still completely usable.

But, since so few people RTFM, people still wail and tear at their clothes when they find it in the FOV. Next to the FSB blur, it's the second-biggest non-issue regarding the ACOG RCO series.

I think he was simply asking WHY it's like that. No need to beat him down over it, is there?

[Artos]

I think he was simply asking WHY it's like that. No need to beat him down over it, is there?

No worries, I'm thick skinned & didn't think much of it or feel the reply was hostile directly towards me per say. If the scope was bought used w/ no manual, I probably would be really weirded out.

You are correct....I'm just curious to why a design would incorporate a blur on 1/2 of the reticle. 'Cuz I told you so' may be the only reason unless someone has knowledge direct from trijicon.

[JSantoro]

I think he was simply asking WHY it's like that. No need to beat him down over it, is there?

I disagree that that's what I did, unless Artos is the sort that is do sensitive that he breaks his fingers when he runs them over the dimples on a golf ball. It doesn't seem so, according to him, so pay attention to those three other fingers on your hand pointing back at you, and not the booger-picking finger you slung at me.

I assist with operator TM tech writing as a part of my job, so language is important, and it doesn't pay to have a question asked of one, and one decides to make up their own question to answer. The question was answered as posted, in which it read like an editing question, and not one of technical aspects of the optic.

It's still a good point, though, because about a 1/2 hour after I DID put up what I did, I figured out that it WAS a "Why?" question. If it'd been face-to-face conversation, context would have clued me in. Mea Culpa for the misunderstanding, Artos. I really thought it was a question about what we'd refer to as a NOTE in a TM at the time.

So, after smacking myself on the forehead and removing the foot that had inadvertently appeared in my mouth, I decided that while in Fredericksburg anyway, why not stop by Trijicon and ask? I didn't know the answer, and should for the purposes of my job. Just because a student hasn't asked it before is no reason why it would never come up. From the horse's mouth.

The prism on which the reticle is etched is mounted inside the housing at a slight R to L angle. Since it is a fixed-focus optic, the right side is slightly out of focus to the operator, and remains that way. If the prism ever does get jostled out of proper position, usually from running the adjusters all the way to either extreme and unscrewing the pins that push it through its elevation/windage adjustments or from significant impact, you may see it get more clear, or more out of focus, signifying that it needs to be serviced.

[Artos]

Good stuff....

I was curious to know exactly how they accomplished this fixed focus task for so many different sets of eyes. I understand it is a different aiming concept but there is a huge focus range for what I need and others like my Dad with the granny glasses.

It has become automatic for me to screw in the front focus when he hands me one of his rifles.

[JSantoro]

The way I understand it, they fix-focus them to a specific distance from the ocular, hence the reason why the eye reliefs are basically more of a recommendation. I know this much: The RCO states an eye relief of 1.5", but I know for a fact that my eye is closer than that. Same with the TA11 model chosen to become our SDO; it's listed as 2.4", but that didn't come off of Mt Sinai written stone. Some folks during our LUEs ended up closer, some further away from it.

Why I may be wrong in my reasoning in that regard: For me and most I train, the only thing that keeps us from getting ridiculously close to an RCO ocular is the fact that we'll get bit by it if we do. The view of the FOV and reticle does not seem to alter focus and I've never seen scope shadow on the close end like I have with other, variable-focus/magnification optics.

Something else to ask them when I get back from Albany, I guess...

[FromMyColdDeadHand]

Just started playing with my TA11H and I can't keep the reticle and a 7 yard target in focus. It seems my eye is drawn to focus on the target and the reticle gets all fuzzy. Not an issue really since even fuzzy it is accurate enough. It goes away by 10-15 yards. At the range today, with the overhangs and clounds I wasn't getting much sunlight, so the reticle was pretty dark. At times at 100yd targets of black circles the reticle seemed to get pretty fuzzy? Too much black on white contrast?

[militarymoron]

Just started playing with my TA11H and I can't keep the reticle and a 7 yard target in focus. It seems my eye is drawn to focus on the target and the reticle gets all fuzzy.

i believe it's because you're under its minimum focus distance. it's still a magnified optic, just with a illuminated reticle. it's not a parallex-free red dot focused at any distance. most magnified optics will have the reticle in focus from some minimum distance to infinity.