To my understanding, the CZ Oberkochen 10x50 is similar (but not the same) to the Jena model. Both have the same field of view, with the Oberkochen having the focuser at the front of the hinge and a different body shape. Optically is regarded to be superior to his Jena brother (but not by a big difference), from specs, the Oberkochen has less eye relief (9 mm vs 12 mm). While is very easy to find the CZJ, is relatively hard to get a Oberkochen model for less than 350 usd. It is regarded as the "binocular of the century".
Whether the Oberkochen model is superior to the Nobilem or the Docter equivalent is not known to me, but for sure J. Gardavsky knows it.
Hello Carlos, hello all,
the Docter Nobilem 15x60 Porro (in my collection) is regarded as a continuation of the Carl Zeiss West 15x60, designed and manufactured for the law enforcement.
On the web page of Jülich GmbH, they claim that the Carl Zeiss West is still better, and it still sells on the eBay for twice as much as the Docter (around 1,500 EUR).
The Docter Nobilem 8x56 Porro, I take for observing of the very faint large nebulae, seems to be quite unique among the German 8x56 Porros. Its contrast performance, and its transmissivity of light in a broad spectral range is very high.
The Docter Nobilem 7x50 is again unique due to its very high transmissivity on the long wavelengths of light, important for the long range viewing.It is dimming the sky glow, as also required for the "nautical binoculars. I take it for terrestrial. There used to be also the Docter Navidoc version.
The Carl Zeiss West counterparts look to me more compact, but so far I have had them in my hands and on my eyes (thanks to the vendors), they have suffered from the stray light problems lowering the contrast on the terrestrial targets against the bright skies.
So I don't have the Carl Zeiss West Porros, and sold the Carl Zeiss Jena Porros. I have also parted from my ZEISS West Classic (Silver) Edition roofs to refinance the hobby astronomy.
I am not saying that the Zeiss West and Zeiss Jena binoculars are a wrong choice, no way, but my eyes have been and they are more happy with the Docter Porros.
To each his/her own,
Edited by j.gardavsky, 22 November 2020 - 05:31 PM.