Scope Optics and Magnification

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This topic contains 14 replies, has 11 contributors, and was last updated by  jadeli89 3 years, 6 months ago.

Viewing 15 posts - 1 through 15 (of 15 total)
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  • November 28, 2006 at 3:04 pm #495281 Back to Top REPORT
    symo
    Symo


    Joined: 6/29/2004
    Here is a copy of the Scope Magnification chart that we made up for SureLoc and the ATA. It is based on the lens diopter and the distance from the lens to your eye. It will be included in the ATA manual. I have included a link to the PDF below the image.

    PDF Version available here.[/url:33243qrg]

    December 12, 2006 at 10:02 pm #506591 Back to Top REPORT
    symo
    Symo


    Joined: 6/29/2004
    Here is a Scope Magnification Calculator that I wrote that will do the calculations for you.

    Basically just enter two of the three values, and the third will be calculated for you.

    [flash width=500 height=100 loop=true]LensPower[/flash]

    January 23, 2007 at 9:25 pm #506592 Back to Top REPORT



    Joined: 5/24/2004
    Symo,

    How do you use the information that the chart and calculator provide?

    I have a 2006 HHA Triple Threat (TT500), that I want a lens kit for (lens kit x). The lens specs are: 2 power – .25 diopters, 4 power – .5 diopters & 6 power – .75 diopters. Using the chart & calculator: the 2X scope needs to be 78.74″ from my eye, 4X – 59.05″ & 6X – 43.74″. Are these the distances from eye to scope that will provide 2, 4 & 6 power?

    The distance from my eye to scope on my Mathews LX is 32″. Given the lens specs, does this mean that the HHA scope will give me 1.26 power, 1.68 power & 2.56 power? Instead of 2, 4 & 6 power? I’m confused.

    Thanks,
    Brian

    :?:

    January 23, 2007 at 10:42 pm #506593 Back to Top REPORT
    symo
    Symo


    Joined: 6/29/2004
    Well, basically, lens manufacturers should not designate a lens by power. The point of the above nomogram and calculator is that a specific lens will be a different “power” or “magnification” for different people. The proper designation is the diopter rating. With the info that you provided above, assuming that your scope to eye distances are correct, the diopters that you quoted would give you the power ratings that you indicated.

    0.25 diopter at 32″ is 1.26 power
    0.50 diopter at 32″ is 1.68 power
    0.75 diopter at 32″ is 2.56 power

    This is the reason that we established the standard/guideline for scope designations. :thumbup [=}=]

    Symo,

    How do you use the information that the chart and calculator provide?

    I have a 2006 HHA Triple Threat (TT500), that I want a lens kit for (lens kit x). The lens specs are: 2 power – .25 diopters, 4 power – .5 diopters & 6 power – .75 diopters. Using the chart & calculator: the 2X scope needs to be 78.74″ from my eye, 4X – 59.05″ & 6X – 43.74″. Are these the distances from eye to scope that will provide 2, 4 & 6 power?

    The distance from my eye to scope on my Mathews LX is 32″. Given the lens specs, does this mean that the HHA scope will give me 1.26 power, 1.68 power & 2.56 power? Instead of 2, 4 & 6 power? I’m confused.

    Thanks,
    Brian

    :?:[/quote:33polf26]

    April 11, 2007 at 1:41 pm #506594 Back to Top REPORT
    limey
    Limey

    Joined: 11/16/2004
    Thanks for posting that as I have used it as a link for years.

    I love it when people say I use a 6x scope :thumbup

    October 12, 2008 at 6:00 am #506595 Back to Top REPORT
    akbdeck
    akbdeck

    Joined: 10/1/2008
    This post was a great help.

    I have a question at what point will a Clarifier be required?
    I would like to add a lens to my HHA sight and I would like the .75 diopter version but as I wear glasses and have bad eye sight the clarifier could be an issue.

    November 16, 2008 at 5:31 pm #506596 Back to Top REPORT
    bade-2
    B||ade

    Joined: 10/11/2008
    Great information, it taught me something. Now I have a question;
    I have two lenses that I bought about 10 years ago. They were sold as a 4x and a 6 x scope which I now know is completely subjective based on a few variables.

    Each lens has a marking engraved on it, one is marked FV+50 the other is FV+75. Would these numbers be the actual diopter of the lens? If so then I can calculate the actual power at my sight distance, correct?

    November 17, 2008 at 12:37 am #506597 Back to Top REPORT
    symo
    Symo


    Joined: 6/29/2004

    Great information, it taught me something. Now I have a question;
    I have two lenses that I bought about 10 years ago. They were sold as a 4x and a 6 x scope which I now know is completely subjective based on a few variables.

    Each lens has a marking engraved on it, one is marked FV+50 the other is FV+75. Would these numbers be the actual diopter of the lens? If so then I can calculate the actual power at my sight distance, correct?[/quote:2zcicuhy]

    Yes, this could very well be the case, but I’m not positive of the designation. Some lens manufacturers erroneously classify 0.5 diopter as 4X and 0.75 diopter as 6X. As you have gathered from this post, that varies from one user to the next. :thumbup [=}=]

    January 12, 2009 at 8:21 pm #506598 Back to Top REPORT

    mich

    Joined: 12/2/2008
    I really don’t need (want) any magnafication but sometimes with my old eyes I’ll see double pins. Would magnifacation help or extending the sight distance
    January 25, 2009 at 7:05 am #506599 Back to Top REPORT

    gregoryb02

    Joined: 12/2/2008
    I really don’t need (want) any magnafication but sometimes with my old eyes I’ll see double pins. Would magnifacation help or extending the sight distance

    Take a look at the “super ball peep” with a “verifier” lens which is specifically designed to alleviate fuzzy pins for older eyes. (note: you will want the verifier lens, NOT clarifier).

    Check out: http://www.bowproshop.com/stringaccessories.html and go half way down the page and they give you a very good example, including pictures, of how this system works. The lens screws into a threaded peep so it’s pretty darn nifty. Good luck.

    December 20, 2009 at 3:01 pm #506600 Back to Top REPORT

    JMOE

    Joined: 12/17/2009
    I read the chart and understand it but the inital question i have is what diopter rating to start with? i have never shot a bow with a scope so i am unfamilar with the right choice.

    My assumtion is to try one but i would hate to make the wrong choice being the price…

    March 10, 2010 at 8:44 pm #506601 Back to Top REPORT
    jbo
    jBo

    Joined: 3/10/2010
    Older thread, but still a valid topic.

    The question I have relates to the use of a clarifier peep with a scope lens. To my knowledge, a verifier[/i:z0vu0rm7] adds no magnification while a clarifier[/i:z0vu0rm7] does.

    My peep-to-lens distance is 34.5″, and the .75 diopter lens nets me a magnification level of 2.917. How does a #1, #2, or #3 clarifier from specialty archery factor into the formula?

    I’ve seen other postings where people have referenced “peep to sight” distance instead of “eye to sight” distance. Is this intentional? Is peep-to-sight distance used with a clarifier, but the eye-to-sight distance used with a verifier or no peep lens?

    March 10, 2010 at 8:59 pm #506602 Back to Top REPORT
    javi
    JAVI

    Joined: 7/5/2006

    Older thread, but still a valid topic.

    The question I have relates to the use of a clarifier peep with a scope lens. To my knowledge, a verifier[/i:16w89un6] adds no magnification while a clarifier[/i:16w89un6] does.

    My peep-to-lens distance is 34.5″, and the .75 diopter lens nets me a magnification level of 2.917. How does a #1, #2, or #3 clarifier from specialty archery factor into the formula?

    I’ve seen other postings where people have referenced “peep to sight” distance instead of “eye to sight” distance. Is this intentional? Is peep-to-sight distance used with a clarifier, but the eye-to-sight distance used with a verifier or no peep lens?[/quote:16w89un6]

    A clarifier is a negative lens when combined with a positive lens in the sight it make a telescope..

    A verifier is a positive lens used to clear up a close object (pins) like reading glasses…

    March 10, 2010 at 9:02 pm #506603 Back to Top REPORT
    javi
    JAVI

    Joined: 7/5/2006

    Older thread, but still a valid topic.

    The question I have relates to the use of a clarifier peep with a scope lens. To my knowledge, a verifier[/i:2pb4qoec] adds no magnification while a clarifier[/i:2pb4qoec] does.

    My peep-to-lens distance is 34.5″, and the .75 diopter lens nets me a magnification level of 2.917. How does a #1, #2, or #3 clarifier from specialty archery factor into the formula?

    I’ve seen other postings where people have referenced “peep to sight” distance instead of “eye to sight” distance. Is this intentional? Is peep-to-sight distance used with a clarifier, but the eye-to-sight distance used with a verifier or no peep lens?[/quote:2pb4qoec]

    A clarifier is a negative lens when combined with a positive lens in the sight it make a telescope..

    A verifier is a positive lens used to clear up a close object (pins) like reading glasses…

    September 28, 2010 at 6:32 am #506604 Back to Top REPORT

    jadeli89

    Joined: 9/28/2010
    thank you for providing all those essential bits and pieces..we all appreciate it that much!! ;) hope you never stop sharing thoughts all the time..nice work!@! [=}=] :thumbup
Viewing 15 posts - 1 through 15 (of 15 total)