Let's talk PORROS! (4 Viewers)

[Stevenkelby]

You are absolutely correct. The one and only exception among the thousends (OK the Nikon comes close).

Jan

Jan, any Nikon in particular or just Nikon porros in general?

 

[jan van daalen]

The Nikon E II.

Jan

 

[dorubird]

Nowadays all technological efforts are channeled to the roof system in binoculars under 56mm aperture! Instead, for larger binoculars, the only option is porro because the roof system does not allow you to have a normal interpupillary distance due to tubes with diameters larger than 56mm. The market for compact binoculars is won by the roof system, and the market for large binoculars is won by the porro system. This does not mean that there are no very good porro binoculars under 56mm aperture: Fujinon FMTR SX, Swarovski Habicht, Nikon SE, Nikon E2, APM ED

Often the roof system has a more complex optical formula than the porro system, for this has a light transmission disadvantage compared to the porro system. Let's not forget that the light transmission record is held by a porro-type binoculars. Everyone knows what binoculars are about ...Swarovski Habicht. I have to admit that there is also Zeiss HT, a very good representative of the roof system, which also has a very good light transmission, but it is an exception that pays by a longer length thanks to Abbe– Koenig prism. We observe here that technological efforts are moving towards a compact roof system. This shows that with the same coating and glass quality, porro system could have been potential optically over the roof system, but technological efforts are moving with predilection towards a compact roof system. It is normal for the market of small binoculars to be the roof system winner, for a more compact and watertight body.

 

[dorubird]

And for the 3d effect often discussed here, the greatest pleasure is to look through a good porro binoculars. The aesthetic effect of stereoscopy is guaranteed with a porro binoculars at small and medium distances. Most of the time I watch birds that are at distances of less than 50m and the 3d effect helps a lot here. With such binoculars I look at simple branches, stones, trees, etc. and I am astonished every time, even a excellent roof does not give me the same pleasure!...it's magic

 

[jan van daalen]

Doru,

Both APM and Fujinon are IF and not CF. Not quite suited for birding in regards to weight and handling..

Jan

 

[CharleyBird]

Could I ask how old these IF bins are (not my auction and I’m not bidding btw if anyone wants to check evil bay )
Lieberman and Gortz super 6x30
S/N 3736047.

Are the serial numbers and dates listed anywhere?

Cheers
Andy

 

[Hans Weigum]

Talking about Porros, not to forget: Leicas newest Geovids are fitted with Perger-Porros.

Hans

 

[Hans Weigum]

One big difference between porro and roof prisms. Roof prism systems must include a phase correction coating.
So inexpensive porros will always give a better image compared with inexpensive roof prism systems that
don't have phase correction.

Here is a detailed explanation how this P-coating should work:

https://www.juelich-bonn.com/jForum/file.php?9,file=1967,filename=P-Belag_Weyrauch.pdf

and here the expert Holger Merlitz mentions its limitations and casts doubts about the ability of manufacturers to fully exploit the benefits of this technology:

P-Belag, Spikes an Dachkanten

www.juelich-bonn.com

Hans