On Chinese ZWB1, ZWB2, ZWB3 lens filter problems

[Dr Klaus Schmitt]

Bought a few of those cheap Chinese Filters for reflected UV photography, to see if the rumor about their not so good Quality Control (QC) is true..





Well, those two out of eight filters had prominent glass striae ("streaks" commonly called)!

Read more about it here: https://photographyoftheinvisibleworld.blogspot.com/2019/10/on-chinese-zwb1-zwb2-zwb3-filter.html

[Akira]

Wow, you could use them only for the light sources then...

[Dr Klaus Schmitt]

Wow, you could use them only for the light sources then...

Even better, I get them replaced... ;-)

[Akira]

Even better, I get them replaced... ;-)

Hope you will get the proper replacements!  They seem to be equivalents of Hoya U-3X0 series.

[arthurking83]

.....

Well, those two out of eight filters had prominent glass striae ("streaks" commonly called)!

....

Does this mean that the other 6 filters were properly OK?
Or did they just suffer to a lesser degree, not worthy of commenting upon?

If the former, then 1 in 4(25% failure rate) is probably too high a risk to take.