I'd like to better understand what compromises must be made for scopes to have a high erector ratio. I understand 4-16 may be all a PRS/tactical shooter needs, but for the rest of us a larger zoom ratio has some real advantages. Using myself as an example, I prefer a scope with a 3x or 4x lower mag for hunting purposes and it would be great to have the option to zoom in to 20x, 25x, or even 30x for shooting long distance at the range. Many, or at least a fair number, of alpha class scopes don't have this range (i.e. ATACR, AMG, etc). March and S&B are two of the more notable exceptions.
FOV is one spec that can suffer from high zoom ratios . As you mentioned ,
March and S & B are the only manufacturers to have overcome the engineering
problems involved . Adding a wide angle eyepiece goes some way to fixing this ,
but that can introduce edge distortion problems , not ideal . It can also introduce
issues getting large elevation travel : having to bend the light path significantly ,
in a longer tube required for high zoom , is less than ideal for a clean image .
The finicky parallax issue that some people’s fingers can’t seem to overcome is
really , really simple . Just change the gear ratios in the system that operates the
parallax mechanism in the optic . I’m surprised I’ve never seen this mentioned
before with so many ‘ experts’ ( cough ) on this site . Race cars have very fast
steering ratios , like March optics . Buses and trucks have very slow steering
ratios , mostly due to the weight , but a lot of cars ( particularly the more pedestrian
models ) have slow ratio steering so Nana doesn’t stack it on the way to the bridge
club , and it’s ‘ easier ‘ to drive .
As you mentioned , having a low number on the bottom end is great for hunting ,
or close steel/paper targets . A lot of folks use their rifles for multiple tasks . I’ve been
known or shoot ( and win ) paper target range comps with a rifle , then go shoot steel at
2000 + the next day with the same rifle . High zoom ratio = high versatility for me . I buy
my own gear , I don’t have to answer to anybody because I use their product ......
Reticle manufacture ( laser etching ) is another difficult issue to overcome ,
I’m wondering if that is why the 45x MIL reticle from S & B was delayed . Look
at the fine detail , and imagine trying to laser etch that : an FFP reticle lens
would comfortably sit on you finger nail with space to spare . They are really
tiny .
Horses for courses , but I really like high zoom scopes . Back in the day when
we ran 3-12 scopes on work rifles , spotter is calling details of partially concealed
target looking through a high mag spotter . I can’t see what he’s seeing , because
I’m maxed out at 12x : very frustrating and an operational problem ...
I’ve had friends DQ stages in comps , because they got a late afternoon draw, and
are trying to find small greyed out ( from impacts ) targets in the shadows . Very hard
to see on 12 or even 16x sometimes , much easier on 30 or 40x then zoom down to
shoot . Manufacturers are making high mag optics , partially , because we are shooting
way further than we were 20 years ago . We need high mag , and big elevation travel .
Without hinky adjustable bases that don’t hold zero , and or clumsy add ons . Sooner rather
than later would be nice .