OSA's Digital Library

Applied Optics

Applied Optics


  • Vol. 17, Iss. 22 — Nov. 15, 1978
  • pp: 3520–3521

Measuring the magnifying power of Keplerian telescopes

Ian L. Bailey  »View Author Affiliations

Applied Optics, Vol. 17, Issue 22, pp. 3520-3521 (1978)

View Full Text Article

Enhanced HTML    Acrobat PDF (655 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools


No abstract available.

Original Manuscript: June 22, 1978
Published: November 15, 1978

Ian L. Bailey, "Measuring the magnifying power of Keplerian telescopes," Appl. Opt. 17, 3520-3521 (1978)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. A. N. Freid, Am. J. Optom. Physiol. Opt. 54, 365 (1977). [CrossRef] [PubMed]
  2. I. L. Bailey, Am. J. Optom. Physiol. Opt. 55, 203 (1978). [CrossRef] [PubMed]
  3. It is well known that for a positive powered lens system, the longitudinal magnification is equal to the square of the lateral (or transverse) magnification. It is not immediately obvious that the same relationship would apply in the case of afocal telescopes. Because imagery of close objects through afocal telescopes has received such scant attention in the literature, it was considered that the derivation of this simple longitudinal magnification formula should be presented here.
  4. The following simple arrangement is illustrative of the convenience of this method. The target plate (as a circular button) is attached to the eyecup of a telescope with translucent tape. While the telescope rests on a tabletop, light from a flashlight or other light source is directed through the telescope. The images of the two target surfaces, are located using a shoebox or a piece of card as a screen, which can be moved over graph paper or a meter rule to measure the distance xo between the images. With the reduced thickness xe of the test plate already known, the magnification can easily be determined using Eq. (5).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


Fig. 1

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited