Top Variable Filter Reviews

JONGSUN 82mm Variable ND Filter, S-Pro MRC 16 Layers Nano Coatings, More Than 10 Stop ND2-ND1000 Stepless Adjustment Graduated, Lens Cloth Kit, Camera Neutral Density Filter

82mm Variable ND Filter Features Optical Glass Made in Japan, 16 Layers MRC and Nano Coatings..
82mm Variable ND Filter Uses 2 Pics 16 Layer MRC CPL Filter of Different Diameters(79mm and 92mm, A Total of 4 Optical Glasses), So That Vignetting Does Not Appear in the Picture..
82mm Variable ND Filter Unique Framework Design,Use Interval Adjustment Locking to Avoid Cross-over..
82mm Variable ND Filter More than 10-Stop ND2-ND1000 Stepless Adjustment Makes Photography More Convenient and Faster..
We Laser Engrave Lettering Into Each MRC 82mm ND Filter Traction Frame to Ensure That The Lettering Won’t Ever Fade or Come Off After Aonsistent Use..

4 Ohm: 60 watts x 4 ch. + 275 watts x 1 ch. | 2 Ohm: 90 watts x 4 ch. + 450 watts x 1 ch. | 4 Ohm Bridged: 180 watts x 2 ch..
Frequency Response: 20Hz - 20,000Hz (Main Channels) + 20Hz - 250Hz (Subwoofer Channel) | High Pass Filter (Variable): 40Hz - 250Hz 12dB/Oct | Low Pass Filter (Variable): 40Hz - 250Hz 12dB/Oct.
Subsonic Filter (Variable): 20Hz - 50Hz 12dB/Oct | Bass Boost (0 - 12dB): 45Hz.

...ects such as waterfalls, streams, waves, clouds or any fast moving subject.
Eliminates buying many fixed ND Filters as it is designed with a built-in rotating ring that controls neutral density ranging from ND2 to ND2000 (1 to 11 f-stop). The heavier the density, the slower your shutter speed will be.
When using this variable ND filter at high ND values (9 f-stop or above) on wide angle lenses, it would appear "X" cross mark, vignetting, reflections or blur in the picture, this is unavoidable according to the structure and operating principle of a variable ND filter. If this is not acceptable to you, please go for a non variable ND filter, for example, a popular JJC brand fixed ND1000 10 f-stop ND filter.
The filter is constructed from German famous brand optical glass that features 9 layers of anti-reflection coatings on each side(total 18 layers), making the filter anti-scratch, anti-static, oil and water-resistant.
Compatible with any lens with 52mm diameter filter thread - This variable ND filter is double threaded, has 52mm inner thread(male) and 55mm outer thread(female), this design allows you to put on any 55mm thread accessories such as lens cap, screw-in type lens hood to the front of the filter.

Specifications: 1-Ohm stable. Mono - block hybrid amplifier. Max power @ 1 ohm: 4800 watts. RMS power @ 1 ohm: 2200 watts. Low levelInput & output. Frequency response: 20hz ~ 250hz.
Input level: 0.2v ~ 6v. Variable subsonic filter: 10hz ~ 50hz. Variable low pass filter: 35hz ~ 250hz. Varaible bass boost: 0 ~ 9db at 45hz. Variable phase shift: 0 ~ 180 degrees.
Remote gain controller. Two amplifiers linkable connector & selector. Fuse ratting: 120a. Linked fuse: 240a. Dimensions: 13.26 length x 6.5 width x 2.25 height.

Portable air scrubber and negative pressure machine with two-stage filter system and variable air flow control of 250 to 500 CFM for mold and sewage....
First stage standard paper pre-filter captures large particles, second-stage primary HEPA filter rated to capture 99.97% of remaining particles down....
Generate cleaner air for any environment..
250-500cfm variable speed switch, including hepa filter change light.
Pre Filter 16*16*1inch, Hepa Filter 16*19*2inch, Same as Drieaz HEPA 500.

Package Includes: (1) ALPINE X-A90V 900 Watt 5-Channel X-Series Car Audio Amplifier Class-D Amp. (1) ALPINE RUX-KNOB.2 Remote Control Bass Knob For....
Remote Bass (RUX-KNOB or RUX-KNOB.2) Compatible. Specifications: CTA-2006 Power Rating: 100W RMS x 4 + 500W x 1 (2.
Dual speaker terminals simplify the hookup of multiple speakers. Heavy duty aluminum alloy heat-sink. Input sensitivity: High level: .5 - 10V Low....
Variable high-pass filter: 50 - 400Hz, -24dB/octave. Variable low-pass filter: 50 - 400Hz, -24dB/octave. Subsonic filter: 8 - 40Hz. Variable Bass....

Specifications: 1-Ohm stable. Mono - block hybrid amplifier. Max power @ 1 ohm: 4800 watts. RMS power @ 1 ohm: 2200 watts. Low levelInput & output. Frequency response: 20hz ~ 250hz.
Input level: 0.2v ~ 6v. Variable subsonic filter: 10hz ~ 50hz. Variable low pass filter: 35hz ~ 250hz. Varaible bass boost: 0 ~ 9db at 45hz. Variable phase shift: 0 ~ 180 degrees.
Remote gain controller. Two amplifiers linkable connector & selector. Fuse ratting: 120a. Linked fuse: 240a. Dimensions: 13.26 length x 6.5 width x 2.25 height.

Linkable function (2 amplifiers) master/Slave, 86% efficiency.
Variable bass Boost: 0-18db, variable lp filter: 30Hz - 300Hz, variable phase Shift: 0-180 degrees.
Damping factor: +350, adjustable 10Hz - 60Hz subsonic filter, RCA input w/ 150Mv (8V) sensitivity.

Portable, lightweight, variable self-contained speed dust collector.
Ideal for carving, sanding, grinding, woodburning, and many small tabletop woodturning projects.
Dust is drawn in by (3) computer-grade, quiet, maintenance free fans.
Each fan runs on a 110V variable speed motor.
Adjustable clear polycarbonate plastic top hood and side doors direct air flow for maximum suction.
Includes (2) grounded 115V outlets on side panel.
Variable speed adjustment control knob on side panel.
Dust is captured by a 2" x 10" x 20" filter.

10-Inch glass-composite low-frequency transducer.
power: 100-120V 50/60 Hz or 220-240V 50/60 Hz.
Input gain control (-30 dB to +6 dB, continuously variable) and continuously variable low Pass filter (50 Hz to 140 Hz).
Switchable high pass filter removes frequency content below 80 Hz from the full-range signal sent to the main monitors.
Momentary footswitch (included) Bypasses the subwoofer, high pass filter, and sub out.
Left and right, balanced XLR and ¼” TRS and unbalanced RCA main inputs.