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-   -   Smallbore Magnification (http://forums.thecmp.org/showthread.php?t=267888)

Full Choke 08-19-2020 11:22 AM

Smallbore Magnification
 
Can someone with more knowledge please confirm if a Gehmann 530 (1.5 magnification with -4.5 to +4.5 diopter correction) is allowed in smallbore metallic sight category or not. And, since I donít want to change sights, is this also allowed in NRA? Thanks very much. Shot CMP any sight with a scope, but want something set up for metallic.

jcj54 08-21-2020 03:42 PM

Smallbore lenses
 
CMP rules
5.2.1 Metallic Sights
Metallic sights may have light or polarizing filters, but they may not contain any system of lenses. A single corrective lens may be attached to the rear sight. Competitors who are 21 years of age or older in the year of the competition may also use a magnifying lens in or on their front sights (maximum +0.75). Spirit levels are permitted on the front or rear sights.

NRA rules

3.7 Sights
(a) Metallic
(1) Non-corrective: Any sighting system, constructed of
metal or equivalent, which provides a method of aim-
ing or aligning 2 separate but visible sights, or reference
points mounted on the rifle, including tube sights and
non-magnifying color filters.
(2) Corrective: Same as (1), except that a lens or system of
lenses, not containing an aiming reference or reticle at
the focal plane of any such lens or system of lenses, may
be included in such system.

Based on the above from the 2020 rulebooks, the Gehman you describe would be legal under NRA rules, but not under CMP rules.

Full Choke 08-22-2020 11:49 AM

I still donít understand the CMP rules. I guess a system is not allowed and a single lue s is? A gehmann 530 is a system? I have never took apart and donít know how many lenses it has.

jcj54 08-22-2020 12:29 PM

gehmann 530
 
According to Gehmann, the 530 has a system of lenses.
Here is the link describing the diopter portion of the diopter/iris unit.
https://gehmann.com/english/products...rie=20&id=1639
The CMP rules are adapted from the ISSF smallbore rules which also do not allow lens systems as currently worded.
As I read it, an iris is OK but a diopter is not.
I would email CMP and ask for clarification, include the following link to Gehmann's site so they know what Gehmann you mean.
https://www.gehmann.com/english/prod...5&kategorie=20
This is why I refuse to shoot ISSF matches, they nitpick the equipment so much it takes the fun out of the sport.

Full Choke 08-24-2020 08:12 AM

Thanks for replies jcj54. I will try emailing CMP, but I have not had good luck in the past about getting clarification about rules. I actually have the 530 with 1.5x magnification, and it doesn't say anything about having a system of lenses on the online description. Only the 530 without magnification mentions "lenses". Yeah, I just want to shoot, and hate spending time trying to find out if I can use certain items. But, I will have a hard time shooting Irons anymore without the 530.

jcj54 08-27-2020 04:48 AM

Magnification
 
Thr statement in the CMP rules that a lens with magnification may be used in the FRONT sight seems to prohibit the use of your 530.it
As I stated, the only way to be sure is to email or call CMP.


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