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Reticles on frontr rear focal plane, why?

 
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  #1  
Old 03-31-2004, 02:02 PM
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Reticles on frontr rear focal plane, why?

Why is it that most scopes have the reticle on the rear focal plane so that when you turn the X up, you get a bigger reticle, which I find so very annoying in most scopes other that what I'd consider for brush and low mag work?

When you're shooting long range or target it's so nice to have a reticle that stays the same, it also means your ranging doesn't change with the magnification.

Where are the advanteges?
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Old 03-31-2004, 04:40 PM
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Re: Reticles on frontr rear focal plane, why?

This is too complex to try to repeat here. Your best option is to look at the complete story at the website for US Opticsat
http://www.usoptics.com/usOptics101.htm

and look at the section on front/rear tradeoffs.
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Old 03-31-2004, 04:53 PM
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Re: Reticles on frontr rear focal plane, why?



[ 03-31-2004: Message edited by: Dimitrios ]
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Old 03-31-2004, 06:16 PM
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Re: Reticles on frontr rear focal plane, why?

You got it backwards. The FRONT focal plane type presents the problem growing reticle.

It's a euro/sniper thing, most of which are mildots. Simple marketing. But as you've figured out(congratulations),these offer little precision, long range potential unless the mildots are in extremely fine subtension(<.25mils).

Go with Nightforce or Leupold. Ignore the rest.
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Old 03-31-2004, 08:31 PM
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Re: Reticles on frontr rear focal plane, why?

<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR> It's a euro/sniper thing, most of which are mildots. Simple marketing. But as you've figured out(congratulations),these offer little precision, long range potential unless the mildots are in extremely fine subtension(&lt;.25mils). <HR></BLOCKQUOTE>

The Premier reticle GEN2 is .20mil and so is the Klein reticle on some of the S&B scopes, i think thats prety good.
Personaly i like these FFP reticles...
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Old 03-31-2004, 09:50 PM
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Re: Reticles on frontr rear focal plane, why?

Express, just to be sure we all are speaking the same language: A forward or 1st focal plane reticle magnifies with the tgt so that both maintain same relative size, ranging aids or holdover marks are accurate at any magnification. With a rear or 2nd focal plane reticle only the tgt magnifies so the reticle is relatively smaller as magnification is increased. Is that also your understanding of the two reticle locations?

If not a 1st plane reticle, then give me a fixed magnification scope. I have the IOR 2.5-10x with illum MP8 in the 1st focal plane on my .300WSM. With my SMK190 load sighted in at 750 yds I can use mil hold-unders regardless of magnification. At 4x I can take out nuisance stray cats at 50 to 100 yds by holding 5 mils low. If I am looking for feral hogs at long range with the scope on 10x and my quarry appears in the shooting lane at 100 yds then the same -5 mil hold is valid. POI shift a magnification is changed is lessened or nonexistant with a 1st focal plane scope. The poster is absolutely correct that stated that the mil dot reticles in many 1st plane scopes are too thick to allow adequate precision for many situations. However the MP8 thin lines are only .05 mil thick. Judging by the 16x IOR MP8 I believe even a 6-24x 1st plane scope could be usable with that reticle design.

If I must assign an advantage to the 2nd focal plane reticle it is during low light close range work at low magnification. Another advantage only valid for magnifications that approach or exceed 20x with the previously mentioned overly thick mil dot patterns is that a 1st plane reticle would likely obscure too much of the target. That is also the reason that in many high magnification variable magnification mil dot scopes the mils are 1 milliradian at 10x.

[ 03-31-2004: Message edited by: RuffHewn ]
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Old 04-01-2004, 04:45 AM
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Re: Reticles on frontr rear focal plane, why?

I think I'm confused here.
Aside from that yes, I can see i had it round the wrong way, thanks.

I have a Nightforce with NP-1RR reticle that only maintains my holdover points and rangefinding capabilities at 15x. Change it and it all goes out the window.

Consequently I use it as if it were a fixed power scope.

Wasn't this supposed to be a front focal plane scope that maintains relativity to target?
Does it have to do with the fact that is it an irregular reticle?
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