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Sakura 20-360X100 Binocular

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/30/2010 at 14:45
prashant View Drop Down
Optics GrassHopper
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Hi all,
I want to buy a Sakura 20-360X100 Binocular, can anyone connect me to a supplier or the manufacturer.
Thanks and regards
Prashant
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/30/2010 at 18:29
NDhunter View Drop Down
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These look to be a good pick for sheep hunters, high power out to 360x.  Let us know how
they perform?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2010 at 04:32
prashant View Drop Down
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The reviews seem to be good, of course the full zoom would only be available under good light conditions. Could someone help me to contact a seller/supplier.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2010 at 10:00
Bird Watcher View Drop Down
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Originally posted by prashant prashant wrote:

 Could someone help me to contact a seller/supplier.
 
Don't WASTE your time or your money on Ridiculous Advertising Claims! Loco
 
 


Edited by Bird Watcher - July/01/2010 at 10:07
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2010 at 10:12
tamanoir View Drop Down
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Hi,
I shoudn't talk about something I didn't use but here the numbers are so HIGH I coudn't resist to send a warning !

A) 20-360X100 : excuse me, but, LOL.
It would translate to 5 - 0,28 mm exit pupil.
0,28 mm exit pupil for such a bino = bullsh*t. It translate to power = 3.6 x diameter. Even with a top perfomer astronomical telescope, and on easy subject as bright stars,
0,28 mm is not funny (dim and hard to maintain aligned with the eye) ; it can be (is) used for very special usage (double star splitting) in very special condition (sky without turbulence).
Even for planets (bright but extend objects) it is too much in practice (in practice 2D is considered a good "limit", even if 2D is in fact a lot and not very comfortable).

All of that comments was for high constrat objects.
Now imagine 3.6 diameters on terrestrial : objects with much less constrast, atmospheric ground turbulence... ==> quality of sight = bullsh*t.
==> Don't trust me on my subjective words, and find your truth by yourself : make this little test : in front of the objective of your bino (or telescope) put a mask with a clear aperture whose diameter is [power x 0,28] (in mm).
Example : if power = 8X ==> diameter of clear aperture = 2,24 mm.
Look and estimate by yourself...

==> your millage may vary, but for me in practice I would say the effective part would be a 5 to 2 mm exit pupil. 1 mm would be very casual on terrestrial.

B) a quik search on ebay shows a dealer who gives these "specs" :
- it is marked "20-360", but there is the "Nikon Magnification" (LOL-LOL) = 20-60 (ok, less funny than 20-360)
- optical diameter 80mm (and not 100mm)
it translate to an exit pupil varying from 4 to 1,33 mm : much less comical, if the quality is very high : but is it possible for 50$ ?
This would be a miracle !

Perhaps they are not too bad at 20X.

OK, I stop my cynical comments. Just be aware of the marketing hype.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2010 at 11:04
spf2 View Drop Down
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wow.. someone actually paid $112 for such a junk on ebay?! 
Seller is based in Taiwan
 
You got to love the specs
 
Quote Technological Reference
Nikon Magnification (By Distance Reduction Rate): 25-60
Objective Tube Diameter(mm): 100
Objective Glass Diameter(mm): 80
Angular field of view(゜): 3(25X)
Field of view(m): 52
Relative brightness: 16
Close focusing distance (m): 17
Weight(g): 2700g
Size (mm): 14.43x 9.06 inches (370x220mm)
Eye adjustable scope(mm): 56-72
 
They advertised the size of 100mm based on the outer tube diameter (not the glass)Shocked
 
The angular view of 3 degree at (25x) is also suspecious. It means 75 degree AFOV, for a zoom binoculars? stop lying...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2010 at 11:16
Bird Watcher View Drop Down
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One more thing to take into consideration, when discussing high magnification binoculars, is the cost of a heavy-duty tripod and heavy-duty head.
 
I own two 30x80 giant binoculars and one 20x90 giant binocular, (plus many other smaller models).
 
My tripod of choice, for Rock-Solid viewing with giant binoculars, is the Manfrotto #3246 tripod (#028B) and a Manfrotto 503 HDV pan head.
 
$285. Tripod
$350. Head
$635. Total
 
A cheaper Chinese version of a similar tripod and pan head would cost at least $250.
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