I want to buy Fujinon FMT-SX binoculars.
Fujinon 16x70mm FMT-SX's prism is BK-7 type as in webpage
http://www.optics4birding.com/polaris-16x70-fmtsxmilspec-2474.html.
BK-7's quality isn't better than BAK-4.
I got a message from a website
http://www.telescope.com/content/learningcenter/content4main.jsp?iContentID=300&CCNavIDs=19,22,28,89.
"Most optical prisms are made from either BK-7
(borosilicate) glass or BAK-4 (barium crown) glass.
BAK-4 is the higher-quality glass and yields brighter
images and better edge sharpness. It is also more expensive."
Does anybody can tell me if 16x70mm FMT-SX's 
exit puple is round with dark edge and its quality is
for astronomy? 

You will have no problem with these binoculars. Their excellence is par none. I do have a problem with the price quoted from the Birding Optics Company though. You can get a far better deal from www.astronomics.com, or www.adorama.com, or www.bigbinoculars.com. $599.50 from Astronomics.

Clear skies

Also that is an error at that web site. They are BAK4 prisms. Check www.bigbinoculars.com for substantiation.

Thanks a lot! I'll check those websites for more information.
Do you think I also need a tripod for that excellent binos?
What brand of trypod is is good for it?

Although i have the uncanny ability to hold a binocular of this mag steadily most cannot.  I do not have six fingers, but  i must be some kinda mutant. A tripod is an absolute necessity. I recommend the Slik Pro 700 DX AMT. Adorama has them for $129.95 although they are out of stock at present. www.adorama.com

Clear skies

Thanks! Do you think another tripod the Slik Able 300DX weighing
about 2 Kg on  www.adorama.com is also great for Fuji binos?
Do they accept ordinary overseas VISA card?

Jeff,

I will leave this last call to you. Get them ordered and enjoy.

Clear skies