The Filters We Need With Digital...

Started Oct 5, 2008 | Discussions thread
OP Joseph S Wisniewski Forum Pro • Posts: 34,130
Don't think Tiffen HT are "dirt resistant"...

jk wrote:

hoya and tiffen now have th same idea as b+w tiffen calles them dht
or digital ht

Tiffen does not promote their "Digital HT" filters as being water, oil, dust or dirt "resistant", or as being any easier to clean than a conventional coating.

http://www.tiffen.com/products.html?tablename=digitalht

They promote them as resistant to abrasion (a "certified" pencil eraser test), brief (24 hour) exposure to humidity, and resistance to damage from adhesive tape (I've never seen a filter that could be damaged by such, adhesives are often used for cleaning optics).

Additionally, as far as coatings go, theirs appears to suck (to use the technical term).

"The Titanium coating consistently reflects less than 1% of the imaging light hitting the front surface of the filter while transmitting nearly 99%"

As has been mentioned elsewhere in this thread, the current Schott (B+W and Heliopan) claim 0.4%, and Hoya coatings are down at 0.3% reflection.

http://www.hoyafilter.com/products/hoya/hoya-02.html

Tiffen reflections are over twice (and possibly 3x) as bad. I take anything Tiffen says about coatings with a grain of salt. I've 30 years of Tiffen telling us that the most demanding professionals didn't want coatings. And I'm not impressed by a 24 hour humidity test. Two of the only three polarizers I've ever had die are Tiffen. The polarizing plastic layer failed (on filters purchased years apart).

and hoya calls then hd or high density

The weird thing is that I found info about the Hoya "HD filters" at a dealer that I trust, the "Filter Connection", but I couldn't find any on Hoya's own site.

http://www.2filter.com/hoya/hoya_hd_filters.html

http://www.hoyafilter.com

The Hoya sounds like it has some of the features of a B+W Kaesemann (better polarizing film, oil resistant coating) but still not the brass rings or the sealed edges of a Kaesemann. Since the Hoyas are considerably higher priced than the B+W ($199 for the 77mm circular polarizer) and they only have the HD version in one of the "big six" filters, the circular polarizer, I don't see them as a true alternative just yet.

They are something to keep an eye out for, though.

either way they all have the
new titanium or whatever resistant coating making them easier to clean

Again, the Tiffen filters are not promoted as "easier to clean",

I don't trust Hoya's claims about the new HD filters. They still promotes their original "Super Multi Coating" filters as "easy to clean":

http://www.hoyafilter.com/products/hoya/hoya-02.html

"In 1996 Hoya introduced the line of Super Multi-coated filters. Consisting of a Skylight, 1B, UV (0), ND 2X, ND4X, and a low profile circular polarizer, this line of filters has a 5+1 layering system on each side of the glass: 5 layers of anti-reflective coating and a transparent easy-clean top coat."

I have Hoya SMC Skylights (from my film days), several UV(0), and two low profile polarizers. They are most certainly not "easy-clean". They are at least as difficult to clean as my Nikon and B+W multicoated (that's pre-MRC B+W multicoating). And I believe they are actually more difficult to clean than competing multicoated filters.

Tiffen calls their coatings "titanium". The Schott filters use a fluoride compound. Don't know what Hoya uses, yet.

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Rahon Klavanian 1912-2008.

Armenian genocide survivor, amazing cook, scrabble master, and loving grandmother. You will be missed.

Ciao! Joseph

http://www.swissarmyfork.com

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