Shopping The Carl Zeiss E-Pl Eyepiece For The Astronomy

Discuss telescope eyepieces.
Post Reply
User avatar
j.gardavsky
Saturn Ambassador
Articles: 0
Posts: 374
Joined: Mon Sep 23, 2019 1:52 pm
Location: Germany

Shopping The Carl Zeiss E-Pl Eyepiece For The Astronomy

#1

Post by j.gardavsky »

Hello all,

as some Carl Zeiss E-Pl eyepieces purchased in the U.S. have been identified as coming from the manufacturing contracted in the Far East, it may be important to have an identifier for the country of origin.

The identifier can be found on the wrap with the documents, when not available, then on the plastic canister.
Zeiss E-Pl plus canister s.jpg
The canister on the pic shows:
- The item number, like 444232-9902 which is also engraved on the eyepiece body
- The product name Okular E-Pl 10x/20 Br (for glasses wearers) foc (focusable)
- The next row shows the traceability code for the quality control QS (Qualitätssicherung)
The second sticker refers to the accessory mounted in the eyepiece for delivery. In this case it is the reticle with a cross.

The production of the Carl Zeiss E-Pl eyepieces has been “iterated” over their production lifetime. Herewith the glass materials and AR coatings have changed, as my collection documents.

The next close eyepiece to the Carl Zeiss E-Pl 10x/20 Br foc is the LEICA HC PLAN 10x/20 Br M (for the measurement reticle).
Lens sizes and surface curvatures.jpg
The both eyepieces have the same basic optics design after König, (field stop – 2 - 1).
The Leica proprietary glass materials with the higher refractive index and a still lower dispersion, have made it possible to materialize the eyepiece optics with smaller surface curvature lenses.

In practice, the both eyepieces have the same field of view, the same focus, and are parfocal. Herewith, I can swap Leica against Zeiss on my Zeiss STEMI stereo microscope without any difference.

On my refractor, the Leica eyepiece shows a higher contrast on the faint low surface brightness nebulae and galaxies, Zeiss passes more light at the blue wavelengths shorter than 436nm, which is helpful on the galaxies with the blue color index.

Thank you for reading and looking,
JG
User avatar
Lady Fraktor
Co-Administrator
Articles: 0
Posts: 4154
Joined: Mon Apr 29, 2019 9:14 pm
Location: Slovakia

Re: Shopping The Carl Zeiss E-Pl Eyepiece For The Astronomy

#2

Post by Lady Fraktor »

Good information, thank you JG
Proper Telescopes: Antares 105 f/15, Bresser 102 f/13.2, Celestron 150 f/8, Stellarvue NHNGDX 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen ED115s f/7.7
Mounts: Berlebach Planet w/ pier, Celestron AS-GT, Celestron CG-5 w/ Argo Navis & tracking motor, SLT w/ pier & tripod mods, Manfrotto 028b w/ SV M2C, Mantrotto 055Pro w/ 128RC, TAL MT1C, Vixen SXP w/ HAL-130 & half pier
Diagonal: 2" A-P Maxbright, 2" Baader Herschel Wedge (P), 2" Zeiss/ Baader Amici Prism (DX2), 2" Orion Amici Prism, 2" Stellarvue DX, 2" TeleVue EverBrite
Eyepieces: Antares to Zeiss
Image
Don Quixote
Articles: 0

Re: Shopping The Carl Zeiss E-Pl Eyepiece For The Astronomy

#3

Post by Don Quixote »

Thank you JG.
Always posting pertinent info.
Thank you Sir.
Post Reply

Return to “Eyepieces”