Emilo. is it black and have hard plastic head band. If so, its like mine and
I wouldn't trade it for the world.

By the by, hello Fabio.

Aloha, grunge sifter Sid

----- Original Message -----
From: "Emilio F Garcia" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, November 03, 2013 1:29 PM
Subject: Re: [CONCH-L] SS Mosquito Screen ?


> Fabio,
>
> I am sure that OptiVISOR is the trade mark. I believe it is made by
> Donegan Optcal Co. My set is X10 I bought it a long time ago and I believe
> it was aboaroundut $60. I have seen the fancier ones but I don't like
> "things" with too many gadgets; I still keep my childhood flare for
> breaking attachments to objects immediately, if not sooner.This set is
> very solid and I have traveled with it to many countries.
>
> Emilio
>
> ----- Original Message -----
> From: "Fabio Moretzsohn" <[log in to unmask]>
> To: [log in to unmask]
> Sent: Sunday, November 3, 2013 12:33:46 PM
> Subject: Re: [CONCH-L] SS Mosquito Screen ?
>
>
> Dear Emilio and all
>
>
> Good test sieves in brass or stainless steel are expensive and a set can
> easily cost several hundred dollars; a single can cost more than $100. You
> can sometimes find used ones on eBay, or the new, odd-sized ones sold by
> people who don't know the price:
> http://www.ebay.com/itm/Ele-International-Standard-Test-Sieve-1-25mm-Metric-1-0-Inches-Brass-/400271017306?pt=LH_DefaultDomain_0&hash=item5d3203055a
>
> (this one has too large mesh size).
>
>
> A cheaper alternative for collectors might be to make your own, as Emilio
> described, or "educational" test sieves with plastic frame and metal wire
> mesh (not brass or stainless steel), such as this set:
> http://www.amazon.com/American-Educational-Screen-Sieves-Piece/dp/B006582JNC
>
>
>
> I bought a similar set a couple of years ago; it is about 4-5 inches in
> diameter, with four mesh sizes; I've seen sets with 6 mesh sizes. I only
> use it with dry shell drift and it works fine, but you can only work with
> a small volume (I use about 1/2 a cup) at a time. The set is more portable
> than the more standard 8- or 12-in diameter sieves, and thus, easier to
> pack for a field trip. I have a few 8-in diameter brass sieves suitable
> for wet material.
>
>
> Emilio, what model OptiVISOR do you have (or recommend)? I see that there
> are several models with lights, exchangeable lenses, and/or with a small
> loupe on one side. Again, one can find a wide range or similar products
> that vary in quality and price. I advise, from my own experience, to avoid
> products sold as "watch repair magnifier", such as this:
>
> http://www.amazon.com/Magnifier-Loupe-Jeweler-Watch-Repair/dp/B00ARBTLWK/ref=sr_1_15?ie=UTF8&qid=1383502403&sr=8-15&keywords=watch+repair+magnifier
>
> The inexpensive pair I bought (on eBay) works well for one eye, but it
> CANNOT work in stereo, i.e., there is no overlap of the field of vision
> from both eyes to see in 3D because of its poor design. Since I don't use,
> I guess I could try to bend the frame to achieve stereoscopic vision, but
> then the frame would not sit well on my face.
>
>
> Cheers,
> Fabio M.
>
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