Ok, just a nice easy question, although I doubt there's a straightforward answer.
For those amongst us considering buying new bins, one of the considerations is whether to go for porro prisms or a roof prism. I wonder if someone could outline the pros and cons of the two prisms formats used in bins, taking into consideration such things as comparative performance, performance v cost, robustness, and anything else I've missed out.
I'm sure this has been discussed in previous threads, but haven't been able to find any former ones.
Thanks
[QUOTE=Stoggler;1528342] I wonder if someone could outline the pros and cons of the two prisms formats used in bins, taking into consideration such things as comparative performance, performance v cost, robustness, and anything else I've missed out.
Thanks[/QUOTE]
- It's largely a matter of taste!
- Roof prisms need special treatment to give top level performance. it makes them more expensive.
- a set of roof prisms consists of prisms that have different shapes. a set of Porro prisms conists of two equal prisms, so the Porro concept is again cheaper.
- performance vs. cost should be better for the Porro design.
- absolute performance is equal for both and depends on the quality of the material and the work (independent of which design is chosen)
- robustness depends on the effort of the manufacturer and is independent of the design
- Porros binos have a better spatial resolution because the objectives are farther apart
that's it.
the rest is: personal taste.
Tom
Thanks Tom
I've only ever owned porros but that's just a matter of circumstance rather than design, and I've always been open to having roof prisms - for some reason I always thought they were superior to porros. However, with your saying that porro prisms are cheaper when comparing performance, and that the spatial resolution is better, I'd be more inclined to go with roofs.