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Forward Focal PLane? |
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YakAk
Optics Apprentice Joined: November/22/2009 Location: Alaska Status: Offline Points: 85 |
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Posted: February/14/2010 at 00:22 |
What is a forward focal plane? Advantages and disadvantages.
Thanks, Steve |
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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Forward or first focal plane (associated with objective lens) allows for utilization of mil-dot or BDC at any power, but the reticle and target size increases as power is increased/gets smaller as power is decreased vs 2nd Focal plane (associated with ocular lens)where reticle size remains constant with power increase/decrease, target size increases or decreases, but mil-dot or BDC is only calibrated for one power setting, commonly 10x or the highest power setting.
I prefer FFP to SFP, but many like the SFP's better...
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Opinion,untempered by fact,is ignorance.
There are some who do not fear death... for they are more afraid of not really living |
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RifleDude
MODERATOR EVIL OPPRESSOR Joined: October/13/2006 Location: Texas Status: Offline Points: 16337 |
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If you use the search function with the terms "first focal plane" and/or "FFP, " you should get a huge amount of material to read on this.
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Ted
Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle. |
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billyburl2
Optics Master Extraordinaire Joined: January/08/2009 Location: Cottonwood, AZ Status: Offline Points: 4015 |
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The only real disadvantage to a FFP is while using it in low light situations with the magnification turned down, the reticle might be hard to pick-up. But this depends on the reticle type, and whether or not the reticle is illuminated.
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If it is tourist season, why can't we shoot them?
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YakAk
Optics Apprentice Joined: November/22/2009 Location: Alaska Status: Offline Points: 85 |
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O.K. I am looking at a 1.5-6x42 with a 4A reticle and FFP. My typical hunting shots would be 20-300 yards. Any advice would be appreciated.
Steve |
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jonoMT
Optics Master Extraordinaire Joined: November/13/2008 Location: Montana Status: Offline Points: 4853 |
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With all due respect, I don't see where FFP would matter in a scope that's so low on the high end (6X) or for shots that are (for most rifles) within max. point blank range. The only scenario I can think of is that because the reticle in an FFP scope is relative to the size of the object you could use the reticle to lead or to correct on a follow-up shot. However, a 4A reticle doesn't have any useful gradations for this.
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Reaction time is a factor...
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YakAk
Optics Apprentice Joined: November/22/2009 Location: Alaska Status: Offline Points: 85 |
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jonoMT,
I see your point. The more research I do, it seems a SFP would be much better for 1.5-6x42. Thanks for the help. Steve |
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