2mm ZWB2 filter tested (visible light blocking filter suitable for 365nm UV flashlights)

Odd, when I signed in to Ali it took me to this page:
http://www.aliexpress.com/item/uv-pass-filter-sample-it-is-free-but-pls-pay-for-the-freight/32311011318.html

and also this: http://www.aliexpress.com/item/2pcs-10mm-ZWB2-Glass-Ultra-Violet-UV-Filter-Pass-Ultra-Violet-Block-visible-light/32410736012.html
two 10mm filters

That must be a medieval type of not so smart advertising: when several people suddenly start viewing a page (like when a thread is started on BLF about a product ;-) ) everyone else is offered that page immediately.

Thanks djozz. Do you know if the shop takes PayPal?

Being an Ali-Express store, they do not accept Paypal. I understood that Simon from Convoy flashlights on Ali-Express does Paypal if you mail him, but I doubt that these guys do that, the filter came with an all chinese business card from Beijing

Thanks for posting that. I did some searching a few weeks back for a small UVA bandpass filter but didn’t have much luck. They were either too large or too expensive for my experiment, or the pricing wasn’t transparent and I didn’t want to give out my email address just to get a quote.

I’m testing an ML8511 UV sensor to help indicate when a 6000 watt mercury vapor lamp is at the end of its life. I was looking for a filter that will reduce some of the UV radiation getting to the sensor and this little filter might be perfect.

@djozz
I was planning to shoot a video in the forest at night and i want to use IR LED light but which spectrum is good at it? 850nm or 940nm?

Nice review djozz. It just seems like it was last week when we were talking about this filter. It’s nice to know that it can filter out that visible light from the RP-3535 and the LED ENGIN.

After looking around I found another store with a good deal. Is 3mm too thick? Too bad it’s not 1.5 or 2mm.

2pcs 20mm ZWB2 Glass Ultra Violet UV Filter Ultra Viole high transmittance

Price: US $19.90 / lot
2 pieces / lot , US $9.95 / piece

Shipping: US $2.51 to United States via ePacket

Total Price: US $22.41

2pcs 20mm ZWB2 Glass Ultra Violet UV Filter Ultra Viole high transmittance

Description:

Diameter: 20mm

Thickness: 3mm

Material: glass

Quantity: 2 pieces

Spectrogram is as follows (Please see the green line ZWB2):

Ah, I’d managed to forget about this being 20mm — the right size for Convoys, thanks for the reminder.

I’d guess the 3mm filters would be significantly worse (perhaps why they’re on sale).

Anyone seen 1mm filters anywhere?

I have ordered two 10mm x1mm filters, but they are still in the mail. I will give an impression when they arrive!

Somebody is going to build a UV pen light before I do. I was thinking of using a Hugsby as my host. They come apart easy.

My host will be this AAA light , but you still may be faster than me because I do not have an emitter for it yet:

but, see also next post..

A few days ago two 15mmx2mm diameterxthickness ZWB2 filters arrived. When I ordered them I did not know of a host yet with 15mm lens, and there appear very few of them! Today I rembered I had an old Romisen AAA RC-F7 (build quality=crap) with a blown switch that might be the right size. Took me half an hour to find it in my rubbish and indeed the lens diameter was 15mm. Managed to repair the switch and mod the light with a led4power 365nm led and ZWB2 filter. Used an ordinary 14mm aluminium MCPCB that I had around and the stock 1 mode little boost driver. It draws 700mA from a partly drained Duracell alkaline AAA, so there's maybe 150mA current leftover through the led. But it works fine, perhaps 1/5th the output of the BLF-A6 that I modded with the same led at 700mA led-current and 20mm ZWB2 filter, best light I have ever seen for banknotes and it is even a bit throwy because of the small die :-)

I just gave this info to Karen from Gearbest to see if they could start carrying this. With the new Convoy S2+ being released soon, this would be a popular and inexpensive item. Maybe twice the cost of a 20mm AR lens ? Banggood also has been given the info a while back.

ZWB2 光学玻璃 滤光片 紫外线透过玻璃 紫外滤光片 20*2mm ¥ 25.00 ( 约USD 3.93?)

More sizes here.
http://world.taobao.com/item/9864926212.htm?fromSite=main&spm=a1z10.3-c.w4002-2181631375.33.7VUEqi

That would be great, and if they go for it, I wonder what they charge. :-)

The first link has a price and says that it is a ZWB2. The other link only says IR, so I’m not sure about that one.

Don’t forget to send me a coupon for the group buy.

I’d buy one!

An affordable filter and the new Convoy S2+ with Nichia UV would be a great combination. Banggood should include one for free with every one of those old stock Convoy S2 with Chinese UV emitter. If they don’t, they will never get rid of them after Simon releases his new UV lights.
Convoy S2 365nm UV Single/3/7 Modes SMO Reflector LED Flashlight

any cheap/english websites selling those filters ? i am looking for 18mm lense.

http://www.gearbest.com/led-flashlights/pp_266823.html

I have seen them in 10mm, 15mm and 20mm, unfortunately not in 18mm yet :-)