The SPREAD = parallax wheels comparison

I am finally doing a comparison of a few popular scopes used for field target. The pictures will show you how far apart in degrees a given scope spreads out the ranging or distance calibration numbers from 10-55 yards.
I encourage you to add your scopes spread to the thread In a similar way.
not showing is the Element Titan 3-18x50 which has a 270 degree spread from 10-55 yards. The Sightron S-Tac definitely held its own. The Sightron S3 10-50x60 Hft scope left before I recorded the spread But memory says it was 220 plus degrees.

IMG_0119.jpeg
IMG_0122.jpeg
IMG_0123.jpeg
IMG_0124.jpeg
IMG_0121.jpeg
 
Last edited:
  • Like
Reactions: qball
Lowly Element Helix 6-24 is at 270 degrees, most I have seen on any normal scope.

Sightron S6 supposed to have over 300 degrees from 10-55 yards but doesn't go beyond that.
Having owned the S6 FT scope you are correct but at 16x when you try to focus past 40 yards - finding repeatability is challenging to say the least but from 9-40 it’s Shazam!
 
  • Like
Reactions: qball
can someone help explain this to me? what does spread effect? what is spread?
@daddypaddy - in field target we add a larger ranging wheel to the parallax side focus feature. Then we calibrate the wheel to our eyeballs by creating a focus course that sets out targets at known distances to focus on… we then make marks on our wheels from 9-60 yards. We do this so when we go to an unknown course we can use the parallax focus feature to determine distances to a target, this is how we determine holdovers or clicks.
So the “spread“ is how far apart the distance markers are on our wheels… more spread generally makes it easier to determine distance when shooting field targets, especially from 10-22 yards as the ability to closely estimate distance is critical to success. We call this ranging.
The below picture is of a Sightron S6 I marked. @qball - in case you want a picture of the S6.
IMG_8130.jpeg
 
Last edited:
  • Like
Reactions: Croxton63
Is it safe to infer that the larger the spread of degrees from 10-55 the more likely ranging will be accurate? In other words is there a direct correlation between the two?

Could one expect that a scope that people reported that ranged very well - the Falcon 503? for example - would have a large spread. A friend at MAFTA reported that he had one, but it didn’t have IR which he preferred for our shaded course.
 
Is it safe to infer that the larger the spread of degrees from 10-55 the more likely ranging will be accurate? In other words is there a direct correlation between the two?

Could one expect that a scope that people reported that ranged very well - the Falcon 503? for example - would have a large spread. A friend at MAFTA reported that he had one, but it didn’t have IR which he preferred for our shaded course.
@Croxton63 - the short answer is yes.... but, and there is always a but.... repeatability is also important.

A scope needs to be able to return to that exact spot (or distance) each and every time it is ranging... we call this repeatability.

Many things can affect this, including "lash" which is slop in the way the lenses move as they engage the forward and backward force of the parallax knob. the more slop, the less repeatability or room for errors. the tighter the movement or the less lash means greater repeatability.
Although some scopes may spread the numbers out further, they may lack repeatability because of lash, esp if the user doesn't understand the need to range the SAME way they set up their ranging wheel.

This is why you will hear many FT shooters talk about using the parallax wheel exactly the same way every time... going from either near to far .... or from far to near .... or going slightly past clear image and then returning to it, but doing it exactly the same way you did it when you set up your ranging wheel.

Since we are sort of on topic, let me add this... the ability of a scope to range accurately also involves the end users ability to create the same eyebox when looking through the scope... sometimes difficult for those people wearing glasses, esp progressive / bi-focals etc.. skinny little glasses provide skinny little windows to get the picture just right... owning a set of birth control glasses (big and ugly) will provide a bigger sweet spot in the middle of the lens. Other factors are cataracts, Macular degeneration, high or low blood pressure, high or low blood sugar... or anything else creating changes to the human eye like jaw clenching when stressed or headaches. Because of these things, if you have cataract surgery your wheel will need to be re-calibrated once your eyes heal.; or if you had high blood pressure or high blood sugar... once those are under control... you will probably need to re-do your wheel as those things affect your vision or ability to focus.

Add to this whole ranging wheel set up, one more tidbit... while setting up a scope, our eyes can fatigue, it is important to constantly "look away" from the scope and and blink and yawn, then come back to the image because if we stare through the scope too long, our eyes and associated muscles try to bring the image into focus instead of the scopes lens system doing the work.


Illumination, to me, or my older eyes is essential, esp when in a dark wooded course where an evil match director has placed a dark brown, dark blue or dark green painted target because after all.... they can.
 
Last edited:
  • Like
Reactions: Croxton63