https://www.bestbinocularsreviews.com/Celestron8x42Trailseeker-140.htm
An updated version of the Trail Seaker 8x42 ED
https://www.bestbinocularsreviews.com/Celestron-TrailSeeker-ED-8x42-Binoculars-review-253.htm
Other informative binocular links:
No el-cheapo low quality binoculars here. Mostly $200 ~ $500 range. And some that approach $3,000.
No they (the $3,000 bino models) won’t be 6x better than $500 ones. Maybe ~ 25% better. It is probably similar to what I learned in school about the design of electronic equipment and MTBF (mean time between failure).
Every increase of MTBF by 10% - Doubled the price of the equipment. [that’s one reason why the space program in the 1960s/ 70s was so expensive. When failure isn’t an option. MTBF has to be very high].
However, it appears the 8x42, 10x42 bins market if very competitive. With 8x32, or other close to the same size bins a close second challenger.
In come cases it looks like today you can buy some of the models in the $400 ~ $500 price class – that now have optics technology that five years ago was only to be found in binoculars costing in $900 ~ $1500 class or 2x ~ 3x as much…
https://www.optics-trade.eu/blog/the-ultimate-8x42-binoculars-buying-guide/
https://www.allbinos.com/binoculars.html
https://www.allbinos.com/160.1-article-Colour_rendering_in_binoculars_and_lenses.html
Some real surprises here. Some very expensive Leica binos were not water proof at all. And some lower priced binos only rated as being splash proof were water proof.
https://www.allbinos.com/18.1-binoculars_review-summary-Endurance_test_of_8x42_binoculars_Introduction.html
BBR: Best Binocular Reviews, well, in the opinion of Jason
Field Testing Binoculars - What I look for in Binoculars & the Equipment I Use
•Oct 30, 2019
https://www.bestbinocularsreviews.com/guides/what-to-look-for-when-buying-binoculars.php
https://www.bestbinocularsreviews.com/binocular-brands.php
https://www.bestbinocularsreviews.com/blog/exit-pupil-06/
https://www.bestbinocularsreviews.com/blog/binoculars-magnification-stability-field-view-09/
https://www.bestbinocularsreviews.com/blog/ocular-lens-size-binoculars-09/
https://www.bestbinocularsreviews.com/blog/tag/binoculars-101/
What does that term mean?
https://www.bestbinocularsreviews.com/glossary-binoculars.php
Often one reads that BaK 4 [ Baritleich kron which is a Barium Crown glass, Schott BaK-4 ] prisms are superior to BaK 7. But only recently did I become aware there is a BAK4, which is something different. And considered not as good as Schott BaK-4.
The Chinese BAK4 is not Barium Crown, but rather a phosphate crown and has a refractive index of 1.5525 and a dispersion of -0.0452 (Schott: -0.0523) and also has a higher permitted bubble count than Schott BaK-4 glass.
Not necessarily a deal breaker or bad thing . Just less good thing. But one ought to be aware of the difference. And read webpage bino descriptions carefully. Who ever writes the webpage may not do careful editing, and write BaK4, when what they are actually using is BAK4 glass.
https://topbinocular.com/binoculars-buying-guide/
"… b. Bak-4 Prism Vs BK-7 Prism
Bak4 aka barium crown glass prisms are usually used in high quaity binoculars because of their higher refractive index than BK7 prisms. Higher refractive index helps collect more light from the periphery of the field of view (FoV) to the eyepiece lens. This produces an image with brighter edge that the BK7 prisms can’t produce very well. The difference is more noticeable in low magnification binoculars that have wide field of view. However, BK7 prisms can be better choice in some models especially those used in binoviewers.
You can easily determine if your binoculars are made from Bak4 or BK7 prisms without reading the model number. Point your binoculars towards the open sky or any light source (but not the sun). If you see a bright and perfectly circular light in the eyepiece end, then the binoculars are made from BaK4 prisms. BK7 prisms will give a diamond shape light source with gray segments around it.
Note : The “ BAK4 ” prisms used in lower quality binoculars are not the same as premium Schott BaK4 prisms. Cheap binoculars ususally, but not always, lebel the prism type as BAK4 (notice the upper case letter ‘A’) while the premium binoculars label as BaK4 with lower case letter ‘a’. Cheap BAK4 prisms are made from phosphate crown glass rather than barium crown glass. These lower quality BAK4 prisms has a lower refractive index than Schott BaK4 and produces an image this is not as sharp as found with Schott BaK4 prisms…"
https://topbinocular.com/what-no-one-told-you-about-quality-binoculars/
Anyway, if ya happen to get seized by an urge to buy binoculars, or other related product. Maybe some of the above links will be helpful in making a better choice. 