Milton Wilcox R.I.P
Quote:Edz - great reviews. It's terrific to have more comparisons made between these binos. Great work as always. And, on the eyecups - Nikon have done these binos a complete injustice.
PS I don't find the rolling ball effect quite so pronounced but I'm probably less sensitive to it - heading so many high balls in soccer (football) probably hasn't helped...
>OTOH, I personally would not be ready to accept the W.O.22x70's 2,8x bigger momentum, compared to the 18x70.
I'm curious, what does the word "momentum" mean in this context? What is the momentum of a pair of binoculars?
Thank you very much EdZ for the interesting reviews you have posted here.
So this cabbie says: "Know who I had in this cab last week? Bertrand Russell! Wisest man in the Western World. And I says to him 'Bertie, what's it all about?' And do you know, he couldn't tell me..." Kenneth Williams
Quote:I wonder if the 7x50 prostar has a different optical construction to it's bigger brothers, the 10 and 18x70.
Quote:I would have thought the latest Nikon EDG models may contain some kind of special glass , but of course have no evidence of such .
"The heavens declare the glory of God"...
Quote:Thanks for that , Stan !
Far preferable to just the link :-)
JAWAID IQBAL ABBASI
Quote:Regarding the Nikon 10x70 that EdZ has tested, I believe Dave is correct and this is not the Astroluxe model which would have red rings around the objectives and a field flattener element before each eyepiece. That fits with EdZ's observations regarding curvature because I'm pretty sure that the 10x70 Astroluxe and the 7x50 Prostar are the same from the prisms back (i.e., the objective barrels of the 10x70 Astroluxe are longer and contain objectives which are larger and have longer focal length than those of the Prostar, otherwise the two binoculars are the same).
Quote:but my comments were regarding the Nikon 10x70 vs the Nikon 18x70. Both have exactly the same focal length. Also, I would put the focal length of the Fujinon 16x70 as near eqaul to both those Nikons. My rough estimate shows almost no difference.
Both tests I do for curvature are done such that I eliminate perception due to magnification. Therefore, I'm not reporting the perception of curvature, I'm reporting the actual measured curvature.
Where is the value f/4.5 for the 18x70 coming from? My quick estimte for the focal length of the Nikon 18x70 results in an f ratio of f/4.2, almost exactly the same as the Fujinon 16x70.
Quote: There were tests on European forums which describe the red-ringed 10x70 Astroluxe's FOV as having virtually no aberrations at all, and even of being the best of all 10x70s. Hence, I strongly suspect the non-red-ringed 10x70 which you've tested as having NO field-flattener, and the red-ringed one as having one
Quote: Quote: There were tests on European forums which describe the red-ringed 10x70 Astroluxe's FOV as having virtually no aberrations at all, and even of being the best of all 10x70s. Hence, I strongly suspect the non-red-ringed 10x70 which you've tested as having NO field-flattener, and the red-ringed one as having one
Based on my tests, I suspect the red-ring 18x70 DOES NOT have a field flattener. Frankly, I'm not too concerned about the Nikon 10x70 with no red ring. It shows lower curvature and lower overall image aberrations than the 18x70.
In another recent post regarding selection of a 10x70, there was a pointer to decade old discussions on Europa.com regarding the 18x70s and 10x70s vs Fujinons. Even on that reliable website, there is misinformation regarding these binoculars. For instance a notable reviewer states the 10x70 Astrolux as having ED glass, when in fact it has been confirmed it does not. My false color tests support that difference in fact vs fiction. I've read numerous posts in various places that the Nikons have superior image right to the edge of field. Compare that to my observed and noted measures where in fact we find the 18x70 Nikon, at the edge of the field, instead of a stellar point, shows stars as lines 2-3 arciminutes long that look like star trails in a time exposure photograph!
I've read so much misinformation about this particular line of binoculars that I question the statement that the red ring indicates a field flattener?
Perhaps that is simply more misinformation, carried over from the fact the Prostar has a field flattener (that really works effectively) and has a red ring.
It may very well be true that all Nikon binoculars that have field flattenrs have red rings. That does not necessarily make it true that all Nikon binoculars with red rings have field flatteners.
Binoculars: Miyauchi Saturn III - 33/39/50/71/150x100, WO 22x70ED, Fujinon 16x70 FMT-SX Pentax 10x50 PCF-V, 10x43 DCF-SP, 6.5x21 Papilio
Nikon 10x35 EII, 7x35 E, 8x30 EII, 8x23CF AS Diplomat
B&L 7x26 Custom
Scopes: C9.25, TMB130SS/FT, SV80S-LOMO 80/480
Les Canon 10x42L IS Swift 8x44ED Ultralite Questar 50th Anniversary Model, Astro Trac wedge on Manfrotto 475 tripod Stellarvue SV90T 90mm Fluorite refractor, Porta mount head on Bogen 3068 tripod Vixen GP-DX on Baader Surveyor Tripod