Cheap 200mm Antlia dual ERF (group buy)

[minhlead]

Hi guys,
I have a source of the 200mm Antlia dual ERF that is very reasonable priced, but the seller requires volume so i think i'd put up an ads here to pooling up anyone interested. The price is filter with aluminum filter cell (see below). The filter has 2 transmission lines at Ha and CaK each with 25nm bandwidth and T% above 90%.
The filter is 10mm thick and promised better than Lambda/4 surface figure. (I heard they aim for Lambda/10 when figure the glass but only promise Lambda/4).
The price are as following:
1700$ for the 200mm (8 inches) Antlia dual ERF filter with the aluminum filter cell, shipping excluded. (I can ship worldwide from Vietnam), estimated shipping to US takes about 100$ for expedited shipping (7-10 days, subjected to change, this is just a ball park, I'll quote the shipping later but I do not think it'll be 2-3x more expensive.).
Antlia is a big name in filter industry and their product is of very high quality (I used their DSO filter and they are very good for the price).
There are another smaller brand (also Chinese) that is selling a 130mm filter single band Ha ERF for just 500$ (shipping excluded). Anyone who wants one I can buy and ship it to you too.
If you are interested, please fill this order form
https://docs.google.com/forms/d/e/1FAIp ... sp=sf_link