This 4-stop, 49mm Tiffen Graduated ND Filter 49mm 4-Stopfrom Tiffen Graduated ND Filter 49mm 4-Stopis densest at one edge where it corresponds to a reduction of light entering a lens by 4 stops and tapers to clear at the other edge. Its gradation can be used to selectively darken an image from edge to edge, allowing for wider apertures or reduced shutter speeds. While this graduated attenuator/blender's 1.2 density can be applied to bright skies, the remaining regions of the image are exposed with a progressively decreasing effect.

This filter is constructed using ColorCore technology, a process that involves laminating the filter substrate between two pieces of optical glass, grinding flat to a tolerance of 1/10,000th of an inch, then mounting to precision metal rings.

1.2 Optical Density    Optical Glass Construction    Aluminum-Alloy Filter Rings    Rotatable Ring for Gradation Positioning    Graduated Effect Over Entire Image    No Line of Transition    Edge-to-Edge Exposure Reduction    49mm Front Filter Threads    Reduce Shutter Speeds, Widen Apertures    ColorCore Technology

• Densest at one edge where it corresponds to a reduction of light entering the lens by 4 stops and tapering to clear at the other edge
• Darkens bright areas of an image, such as skies, while the remaining regions of the image are exposed with a progressively decreasing effect
• Maximum 1.2 density corresponds to a 16x filter factor and 4-stop exposure reduction
• Constructed from optical glass for clarity
• Noncoated
• Aluminum-alloy filter ring assembly for durability while remaining lightweight
• Rotatable filter ring assembly allows for gradation positioning along the horizon line
• 49mm front filter threads allow for use with other filters
• Plastic case included for storage and transport

Related Questions and Answers

Q: 1. Does this fit on a Sigma 17-50mm f/2.8 EX DC OS HSM Zoom?

A: Yes, the Sigma 17-50 you've described is a 77mm diameter lense. This filter will fit.

Q: 2. I'm looking for a 62mm polarizing filter for a 18-250 zoom I recently bought at B & H, on top of wanting a decent one I want one with a solid lens cap, I will be leaving this on the lens allot and a good filter is not much use if it is dirty or scratched. I previously bought B+W that had a useless plastic cap that would not stay on. Will the sigma lens cap attach to this or does it come with a decent one?

A: The Tiffen 62mm Digital HT (High Transmission) Circular Polarizing Multi-Coated Filter is front threaded at 62mm's so you will be able to use the Sigma lens cap as designed.

Q: 3. Is this filter made in Japan?

A: As per our records, the Hoya ProND EX 1000 Filter (82mm, 10-Stop) is currently made in Japan. Please note that this is subject to change at any time.

Q: 4. What is the thickness of the 77mm Digital HT (High Transmission) Circular Polarizing Multi-Coated Filter by Tiffen? I plan to use it on a 17MM lens and want to make sure there is no vignetting.

A: The Tiffen 77mm Digital HT (High Transmission) Circular Polarizing is about 3mm thick.

Q: 5. What are the filter and stop factors for this filter?

A: The filter factor is 3 and the stop loss is 1 and 2/3 stop

Q: 6. Does this come with a lens cap?

A: Unfortunately, a cap is not included with this filter.

Q: 7. I have this filter in the 55mm size but the lens caps that I have will not stay on for more than a few seconds, the slightest pressure on them pops the cap off the lens. Anybody find a lens cap brand/model that works with this filter?

A: The Sensei 55mm Center Pinch Snap-On Lens Cap is compatible with the Tiffen 55mm Digital HT (High Transmission) Circular Polarizing Multi-Coated Filter.

Q: 8. Does this filter have front threads that will accept a screw-on lens hood?

A: Yes, it does. I use it with a lens hood often.

Q: 9. What is the Low Profile Titanium Lock Ring? Is this a way of locking the filter, to stop it rotating?

A: The lock ring holds the glass in the main filter ring. It is low profile to avoid vignetting. This has nothing to do with the rotation of the filter for polarization.

Q: 10. Looking for a 77mm lens filters for my new nikon 70-200 f2.8. I'll be using in Iceland in winter when it might be gray overcast with lots of white snow? any suggestsion? on d750 camera

A: We recommend this circular polarizing filter, which will help you to eliminate any reflected light when shooting around water. It will also make blue skies pop and white clouds pop if you happen to encounter those conditions. We also recommend a protection filter such as a href= https://www.bhphotovideo.com/c/product/533244-REG/Tiffen_77HTDUC_77mm_Digital_HT_High.html target= _blank https://www.bhphotovideo.com/c/product/533244-REG/Tiffen_77HTDUC_77mm_Digital_HT_High.html/a