POI at different mag levels, SFP

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Nation,

A first focal plane scope, the holdover at any given distance SHOULD remain constant for all magnification levels.

For instance, if your zero is 30 yards, and in order to hit 40 yards, you'll need to hold 1 mil high. That 1 mil on a First Focal Plane scope should be the same, for all magnifications at the distance of 40 yards. If you are at 6x, it'll be 1 mil high. If you're at 25x, it SHOULD still be 1 mil high.

A second Focal Plane scope is another animal. You have a lot more "bracketing" or magnification options for a given distance. This is probably why the majority of Hunter Field Target competitors generally use second Focal Plane scopes......there's more options for aiming.

Tom Holland 

Field Target Tech 

Fieldtargettech.com 
 
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Simply put, a second focal plane scope will have an accurate center crosshair and holdover reticle at a manufacturer-specified magnification. At this specified magnification level, if the turret movements match the reticle, then the turret click value will match what you are seeking on the reticle hash markings. The center crosshair or dot should not change by changing power levels, but it may depending on the optics and their positions within the tube.
 
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As stated above, the central cross hair aiming point theoretically should not show any change in POI in either FFP or SFP with changes in magnification. Quality determines whether that is actually true for each individual scope. For SFP, magnification changes reticle size to target size relationship in that the target magnifies but the reticle stays the same (and thus holdover points change) but for FFP the reticle increases or decreases in size directly with the target so holdover points remain stable in relation to target size.
 
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Bandg,

That's exactly how I see it. I dial in for yardage and don't pay attention to what magnification I'm using for any particular distance. As for scope quality, it's a Delta Stryker. I'm know it's not the best but it's the best that I have. Only one thing I would change with my Delta...I wish it was FFP. Any other scope out there that offer similar specs that come in FFP?

Great glass, 10 yard Parallax, center dot (illuminated center, not entire reticle, high mag (at least 24x), zero stop, fantastic turrets (Arken are the best I've used), great warranty...


 
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IguanaPolicE,

Everybody answered your first question that the center for always stays aimed at the same point. 

To your other question about higher end higher mag FFP scopes having similar specs... there are some that go down to 10 yards (not tons) and most don’t just have a center for illumination either. 

The Element Nexus is probably the closest in price level. Other that are much more expensive are the NF ATACR 7-35, March scopes, Schmidt Bender 12-50 FFP, to name a few. Many of the ones we all see usually only go down to 25 yards. There are plenty others if you only want to go as high as 24x and want to drop down in quality. 
 
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IguanaPolice, 😊

I'll attach a Scope Specs List for 6-24x / 5-25x / 5-30x scopes,

▪sorted FFP vs. SFP,

▪with 10y side parallax,

▪holdoff reticle,

▪exposed turrets,

▪and max. price around $500.



Hope you'll find something that fulfills your requirements.

Matthias



❌ Attachment:

download.png
View attachment SCOPE SPECS TABLE. For 6-20x 6-24x, 5-20x, 5-30x Magnification. 118. 2020-11. TABLE.1611127071.pdf


 
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The $499.48 on sale for less than half price at MidwayUSA FFP Crimson Trace 3 series 5-25x56 34mm has EQUAL QUALITY GLASS as your Delta Stryker and has 10 yard focus.

Just a FYI...

They sell on Amazon right now for $935.00 and $998.95 at Optics Planet and $695.00 on EBay apparently people flipping them MidwayUSA's for profit now.
 
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Terrific table. I'm going to keep looking through it. Thanks



I just looked through that same exact Crimson Trace and compared to a Crimson Trace (3-24) that I had purchased. The glass is fantastic! I really wanted the 3-24 to work for me but I could NOT stand the reticle so I returned to MidwayUSA. The 5-25 model is near the top of my list right now.
 
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I don't know if this is related to the talk we had, but what I was referring was that if you mark your turrets with yards in a SFP scope those marks are going to be true only at one magnification, if you change the magnification and use your marks you will get a POI shift. With a FFP you don't need to worry about it, you can use your turrets marks in any magnification
 
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I don't know if this is related to the talk we had, but what I was referring was that if you mark your turrets with yards in a SFP scope those marks are going to be true only at one magnification, if you change the magnification and use your marks you will get a POI shift. With a FFP you don't need to worry about it, you can use your turrets marks in any magnification
Click to expand...

You should not get any shift, unless the center reticle dot or crosshair is not truly the center as your seeing it. If the lenses are not aligned or the reticle center is offset then changing the magnification levels will induce error from turret functions. A somewhat similar example of this is the Hawke XB30 SR Pro crossbow scopes. They advertise center as 50 yards, but the center reticle mam be 45 yards (even though advertised at 50) and you sight in at 50 them move the "speed ring" it does not come out right at 20 and or 100 yards, and the 50 yard hash mark is no longer valid. So in that example, you need to experiment to know what yardage the center is based on the reticle. Because of the scope, you may not be getting a true center at every magnification.
 
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This thread is the reason I prefer FFP scopes. If I want to zoom in a little more and I'm holding over I don't want to think about the spacings in the reticle changing value as I change zoom and only being "true" at one zoom setting.
Click to expand...

Agree that this seems to be the main advantage for FFP scopes-consistency in image related to holdover. It is why I like them because I predominantly shoot with holdover and don't "click to zero" for varying ranges. FFP disadvantages noted by many are that the size of the reticle can become too large or too small for some shooting situations. I have a couple of Hawke FFP scopes with a fine reticle that seems to disappear sometimes until I zoom it in some and this is not always helpful.
 
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This doesn't make any sense to me because when you mark your turrets by putting yardage number stickers on your elevation turret you are clicking it for you shots so the SFP and FFP reticles would not matter anyway since you are aiming dead center when dialing in clicking the elevation turret.
Click to expand...

Yes you are right, I was confused thinking about holdover, the yardage in the turrets are not going to change with the magnification, the holdovers do in a SFP
 
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