Hoya comes with few grade of UV filter ranging from Hoya normal blue cover, Hoya HMC - grey and orange, Hoya Pro 1 - dark blue and now Hoya HD - black cardbox.
The diff? try to get the range that you can afford. At lease HMC, personally I cant see any diff Between Pro 1 and HD from the photos. But what you can feel is the price different between these two. The diff is actually at the frame and the lenses. Please read more about it at Hoya website Here.
Some photographers don't even use a filter reason is degrade the image quality. They prefer to use with lens hood. Remember not all lenses comes with hood but you can buy them separately eg. Nikon 50mm f1.8 and f1.4 and 80-200mm doesn't come with lens hood. Lens hood can serve as protection to the front outer most glass at your lens but it has another purpose of its own, which is to prevent flare, which can seriously degrade the image quality of photographic lenses.
If you ask me any diff with and without UV filter, that's depend on the range. If you are using cheaper filter it will block some lights entering. Remember camera is about capturing lights. You can try it with and without your filters see any diff at your shutter speed.
I have not tried other popular brand like B+W because Hoya is already good enough for me and my wallet.
finally for me filter act as a protection to my lenses and not so much about the UVs. So if you want to get a filter like I said at least Hoya HMC or better PRO 1.
photo by "noelbynature" from photomalaysia - credits to the owner. Dare you walk out in the street without a filters!
guess which one is Hoya HMC and Leica UVa? Does the color reflected off from the filter mean anything to us?
When I put on the Leica filter on my lens - no vignetting!
and if you ask me any diff between these two models but same brand I would say NO NO NO, the only this you will feel is the price diff.so what is Hoya HD?
Hardened optical glass that has 4 times the breaking strength in ANSI standardized testing (ANSI Z80.3 : 2001) where a steel balls of varying size and weight were dropped from a height of 50 inches onto the glass.
HARDENED 8 LAYER WATERPROOF MULTI-COATING THAT IS SCRATCH & STAIN RESISTANT
Newly developed industry leading 8-layer multi-coating yields an average light transmission rate of 99.35% between 400 and 700nm (visible spectrum). These coatings greatly reduce reflections off the surface of the glass allowing you to capture more light in your photos.
As with all HOYA multi-coatings,HD HMC is applied in a furnace at high heat, bonding the coating to the surface of the glass. This process is called "hard coating" and it is far more durable than other coating techniques. The chemistry of the top layer is formulated not just to be more durable but to be resistant to oil stains. This means that finger prints and other oils are much easier to remove.
In short Hoya HD =
• High Density Sharp Cut UV Glass
• Chemically Enhanced Optical Glass is 4x Stronger
• 8-layer Anti-Reflective Multi-Coating
• Water & Oil Repellent, Scratch & Stain Resistant
• Wide-Angle Lens Compatible Ultra Thin Frame - same frame thickness to Hoya PRO 1 also
• Glass Mounted with High Pressure Press Technology
My really conclusion to Hoya HD filters is I will get only if I have extra $$$ to spend and want to protect my filter from knocking. FYI the diff between Hoya PRO 1 and Hoya HD 77mm is RM100.
Optically I cant see any diff from my images result. Cheaper range you might get vignetting and ghosting effects.
As you start to stack anything over the cheaper range of UV filter, meaning place another PL-CIR over you will get vignetting.
I'm thinking now what am I writing here!@!@#!