ASTM F1753-96(2010)
(Specification)Standard Specification for Classification and Marking of Single-Lens Scopes for Use with Archery Bows
Standard Specification for Classification and Marking of Single-Lens Scopes for Use with Archery Bows
ABSTRACT
This specification covers the classification and marking of single-lens scopes used in conjunction with archery bows. The lenses are classified in terms of optical magnification, scope markings, and charts of the empirical relationship of the apparent magnification that the consumer can expect to obtain when a correctly marked lens is used under specific conditions. The visual acuity of the lenses is related to the magnification of the lens in general, and is dependent on other factors such as the specific individual, lens quality, and the size of the rear aperture used with the lens. This specification does not go beyond this definition of acuity.
SIGNIFICANCE AND USE
This specification is intended to ensure uniform classification of the lenses and the marking of scopes to avoid confusion of the consumer, which results form the use of different classification and identification systems.
This specification is based on the use of the diopter that is the reciprocal of the focal length of the lens as measured in metres.
SCOPE
1.1 This specification covers lenses and scopes used in conjunction with archery bows. It establishes a standardized system for the classification of these lenses in terms of their optical magnification, the marking of the scopes in which the lenses are mounted, and charts depicting the empirical relationship of the apparent magnification the consumer can expect to obtain when a correctly marked lens is used under specific conditions.
1.2 Acuity—The visual acuity of these lenses is related to the magnification of the lens in general. For the average subject there can be an improvement in acuity with lenses having apparent magnifications of 2 to 4× and a decrement in acuity with lenses of 6× and greater.
1.2.1 Acuity also is dependent on other factors, such as the specific individual, lens quality, and the size and quality of the rear aperture (peep) used in conjunction with the lens. Beyond this statement, acuity is not the subject of this specification.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F1753 −96(Reapproved 2010) An American National Standard
Standard Specification for
Classification and Marking of Single-Lens Scopes for Use
with Archery Bows
This standard is issued under the fixed designation F1753; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope magnification formula. When the eye-to-scope distance is
measured in inches, it is designated as (ESI). To calculate
1.1 This specification covers lenses and scopes used in
apparent magnification, the metres-to-inches conversion factor
conjunction with archery bows. It establishes a standardized
of 39.37 appears in the equation.
system for the classification of these lenses in terms of their
optical magnification, the marking of the scopes in which the 2.1.4 focal length, n—distance, measured in metres, from
lenses are mounted, and charts depicting the empirical rela- the center of the subject lens to the point where incident plane
tionshipoftheapparentmagnificationtheconsumercanexpect lightwavespassingthroughthelensarebroughttothesharpest
to obtain when a correctly marked lens is used under specific possible focus.
conditions.
2.1.5 optical magnification, n—characteristic of a particular
1.2 Acuity—The visual acuity of these lenses is related to lens defined as the reciprocal of the lens focal length as
measured in metres and stated in diopters.
themagnificationofthelensingeneral.Fortheaveragesubject
there can be an improvement in acuity with lenses having
2.1.6 peep sight, n—rear sighting device placed in or onto
apparent magnifications of 2 to 4× and a decrement in acuity
the bow string, having a small opening in it that the archer
with lenses of 6× and greater.
peersthroughtoviewthelensorscopebeingusedasasighting
1.2.1 Acuity also is dependent on other factors, such as the
device.Thecombinationofthelensandrearpeepsightusedin
specific individual, lens quality, and the size and quality of the
this manner mimics a primitive telescope.
rear aperture (peep) used in conjunction with the lens. Beyond
this statement, acuity is not the subject of this specification.
3. Classification
1.3 The values stated in SI units are to be regarded as
3.1 Optical Magnification—Thisisthemagnifyingpowerof
standard. No other units of measurement are included in this
a lens as measured by the reciprocal of the focal length of the
standard.
lens in metres. It is expressed as a practical unit in terms of a
focallengthequaltoonemetre(theunitdiopter).Thelargerthe
2. Terminology
diopter number, the greater the magnifying power of the lens.
2.1 Definitions:
3.2 Apparent Magnification—This is the apparent increase
2.1.1 apparent magnification, n—apparent increase in size
inobjectsizeoneexperienceswhenviewingtheobjectthrough
of an object as viewed through the subject lens held at a
one of these magnifying lenses. It is dependent on the
specific distance from the user’s eye.
following two factors:
2.1.2 diopter, n—reciprocalofthefocallengthofthelensas
3.2.1 The optical magnification of the scope lens as mea-
measured in metres. One diopter is the rating obtained when
sured in diopters, and
the constant 1 is divided by the focal length value of a lens
3.2.2 The distance the scope is placed from the user’s eye.
having a 1-m focal length.
3.3 Apparent magnification is defined empirically by the
2.1.3 eye-to-scope distance (ETS), n—distance the (scope)
following relationship:
lens is placed from the individual’s eye when in use. If the
eye-to-scope distance is measured in metres, it is specified as Apparentmagnification 51/~1 2 D 3 ESM! (1)
(ESM) and no conversion factor is required in the apparent
where:
D = lens optical magnification, diopters, and
This specification is under the jurisdiction ofASTM Committee F08 on Sports
ESM = eye-to-scope distance, m.
Equipment and Facilitiesand is the direct responsibility of Subcommittee F08.16 on
Archery Products.
3.3.1 If the e
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