20x100 with least astigmatism but 20mm eye relief

[25585]

Quite a few 20x100 bins but which have eye relief of at least 20mm and the least astigmatism, chromatic aberration and other optical defects?

[Ruud]

Of the binoculars with at least 20mm eye relief, only one pair has the least astigmatism and only one pair has the least CA. Also, only one pair has the least field curvature, only one pair the least spherical aberration and only one pair the least coma. There are  more aberrations still.

My guess is that no pair of binoculars meets all criteria at once!

 

 

[Louis D]

If you're interested in high-end large binoculars, contact Markus Ludes at APM.  He probably has the best selection and could probably make a good recommendation.  You could also go with a bino telescope instead.

[Chris]

What's your budget? 

These review very well:

https://www.firstlightoptics.com/helios-binoculars/helios-lightquest-hr-100mm-binoculars.html

I have the 8x42 Lightwing ED, which seem to be the baby version of the Lightquest and they are stunning. 

[25585]

10 minutes ago, Lockie said:

What's your budget? 

These review very well:

https://www.firstlightoptics.com/helios-binoculars/helios-lightquest-hr-100mm-binoculars.html

I have the 8x42 Lightwing ED, which seem to be the baby version of the Lightquest and they are stunning. 

Those look like the APM equivalents. Might go for that pair.

[Stargazer McCabe]

I have the 25x100 LightQuests on Valentin's P Mount. Very pleased with them... 

Steve Tonkin @BinocularSky did a very thorough evaluation of the 25x... http://binocularsky.com/reviews/LightQuest_25x100.pdf

I'm sure the 20x will at least be as good...

[25585]

2 hours ago, Stargazer McCabe said:

I have the 25x100 LightQuests on Valentin's P Mount. Very pleased with them... 

Steve Tonkin @BinocularSky did a very thorough evaluation of the 25x... http://binocularsky.com/reviews/LightQuest_25x100.pdf

I'm sure the 20x will at least be as good...

I have Valentin's p-mount as well. If its steady enough that's a point in favour of both bins and mount.

Steve's comment about exact eye positioning to reduce CA and image from 80% out is concerning however as I wear specs. 20x acc to FLO gives 20mm er, so minus 3mm, 17 usable may just be OK.

[BinocularSky]

5 hours ago, 25585 said:

Steve's comment about exact eye positioning to reduce CA and image from 80% out is concerning however as I wear specs.

Needn't be a problem: once you get the IPD set properly, getting your eyes on axis, even with specs, will become one of those dont-think-about-it-anymore intuitive things.