Diamond cut from crystal-clear, water-white optical glass, Schneider filters are ground and polished to a precise flatness and planeparallelism (exact parallel relationship between front and back filter surfaces). Then, to ensure perfection, this is verified by a laser interferometer. Schneider filters are then checked with a densitometer for consistent density, and tested with a spectrophotometer for proper light transmission. It's due to this ultra-high consistency, that allows cinematographers to swap like filters mid-shoot with no discernible variation in color or effect. What's more, the unprecedented purity, color saturation and repeatability of Schneider filters virtually eliminate the need for lab color timing correction.

• Consistent precision
• Ultra durability
• Schneider filters work with long lenses

Diamond cut from crystal-clear, water-white optical glass, Schneider filters are ground and polished to a precise flatness and planeparallelism (exact parallel relationship between front and back filter surfaces). Then, to ensure perfection, this is verified by a laser interferometer. Schneider filters are then checked with a densitometer for consistent density, and tested with a spectrophotometer for proper light transmission. It's due to this ultra-high consistency, that allows cinematographers to swap like filters mid-shoot with no discernible variation in color or effect. What's more, the unprecedented purity, color saturation and repeatability of Schneider filters virtually eliminate the need for lab color timing correction.

Schneider filters stand up to the most rigorous demands on set or location. Many feature Schneider's specially formulated hard anti-reflective (AR) coating to resist flaking, peeling and scratching. This proprietary coating also reduces light loss and flare to less than 1% per surface, compared to untreated glass that has a light loss of 4% per surface. Schneider screw-in filters feature virtually jam-proof brass precision mounting rings, while unmounted Schneider laminated filters are protected against delamination and edge-chipping by Schneider's unique Edge Seal, which also reduces edge reflection and edge flare.

The common perception among photographers and cinematographer's is that filters should not be used in front of long length lenses, due to the critically short depth of field of these lenses. This belief is often confirmed when poorly made glass or "plasticresin" filters are placed in front of a long lens, and the degradation of the image is visible simply by looking through the viewfinder. This degradation is caused by poor quality control, low-quality glass and poor glass grinding and polishing techniques used in the manufacture of such filters. Schneider filters have no such problems, and can be used in front of even the longest lens. Diamond-cut from high-quality optical glass, then ground and polished to precise lens-making standards, Schneider filters offer unsurpassed clarity, light transmission and color saturation with absolutely no visible compromise of image quality. Even when stacked, they are the clear choice for use with any lens.

Related Questions and Answers

Q: 1. Can this unit be used with film cameras?

A: Yes, really no different than a digital camera but if you have them I'd recommend staying within parameters established for a like focal length and ASA/ISO value just for ballpark exposure.

Q: 2. Does this package include a dovetail plate for mounting camera/optics?

A: The Sky-Watcher Star Adventurer GTi Mount Kit does not come with a plate.

Q: 3. Does it come with carrying case?

A: No. It doesn't.

Q: 4. What's the cable model to connect tracker to camera to user with intervalometer?

A: The cable will attach to the camera body directly. Need to know make and model of the camera.

Q: 5. Is this compatible with the Sony 28-135 mm lens which has a 95mm thread?

A: No, The SmallRig Star-Trail Lightweight Multifunctional Modular Matte Box VND Filter Bundle is designed for smaller lenses that have 67,72,77 or 82mm filter threads. The opening is 95mm but would not work with a 95mm filter.

Q: 6. Does this have a built-in intervalometer?

A: Sky-Watcher Star Adventurer GTi Mount Kit (with Tripod and Pier Extension) intervalometer is available in the app that you run on your smartphone. You also need to purchase a shutter release cable separately that connects from the camera to the tracker.

Q: 7. How tall is the tripod?

A: The Sky-Watcher Star Adventurer GTi Mount Kit (with Tripod and Pier Extension) BH #SKSAGTIMK • MFR #S20595 has a Height Adjustment Range of 26.8 to 44.5" / 68.1 to 113 cm

Q: 8. Does this item ship to UK with no tax fee's ? Also do I need to buy the Equatorial Wedge Base for taking astro photos with my DSLR's photo tripod ? or do I need any other accessory for DSLR astro photography? Than you.

A: Can't help on UK taxes. You can use a regular tripod, but you need to point the axis of the mount at Polaris, which may be harder without the wedge. The wedge has a knobbed gear wheel for the elevation. You may also need a ball head to pint your camera at what you want to track. If so, get one with at least a 46mm head.

Q: 9. If I have a standard camera tripod and DSLR, can I go straight into photographing the Moon, Orion Nebula, etc., without purchasing *anything* else, or must I also get the counterweight, any kind of wedge, ball head, etc. for it to be a complete setup? I am comparing this to iOptron and need to know what else is required.

A: Using a DSLR should not require you to use a counterweight unless the camera and lens combo approaches the 11 pound threshold. I purchased all of the accessories just in case they were needed I'd have them to use. I only use the counterweight when affixing my ETX to the ball head. Depending on the total weight of the camera and lens, coupled with the stability of the tripod you have, you may want to have some form of counterweight, even if just for the tripod itself, to ensure steady images.

Q: 10. only black color?and only Dec BracketPolar Scope Illuminator ?

A: The illuminator is a poor design. You need to remove the bracket to use it on the polar scope. With a mount this light (and the non-heavy duty tripod I supposed most people will be using), re-attaching the bracket and camera will require you to do PA again.