The 49mm Ice Slim MC LiPo Filter 49mm for Night Sky Starfrom Ice Slim MC LiPo Filter 49mm for Night Sky Staris designed to reduce the appearance of light pollution in images or videos that include the night sky and illumination from artificial light sources. Light pollution occurs in areas of the night sky that are above or near concentrated and intense sources of artificial light such as cities. These light sources can include exterior and interior lamps for commercial or residential buildings, brightly lit advertisements such as billboards, streetlamps, as well as sports and entertainment venues.

High Quality Optical Glass    Nano Multicoated, 16 Coats    No Color Cast    Water Resistant

Blocks out skyglow without changing the entire color spectrum.

Superfine matte black frame.

Double threaded metal frame for additional filters or hood.

Ideal for wide angle lenses.

Related Questions and Answers

Q: 1. Is there an alternate counterweight that is LESS than the 5.5 lb. supplied that will fit the shaft? If yes please provide link

A: The Sky-Watcher Star Adventurer GTi Head Kit does not have any optional counterweights.

Q: 2. Does it come with carrying case?

A: No. It doesn't.

Q: 3. Is this compatible with the EQM-35 Pro mount? Will other adapters be required?

A: The Sky-Watcher Star Adventurer GTi Head is not compatible with the EQM-35. This tripod would be recommended instead: https://bhpho.to/2xCHOap

Q: 4. what's in the box - is it everything except the tripod? does it include the counterweight kit too?

A: Sky-Watcher Star Adventurer GTi Head Kit (Head Only) BH #SKSAGTIHK • MFR #S20590 Counterweight (2.5kg - 5.5 pounds) . Counterweight collar . Counterweight shaft . Counterweight safety screw Azimuth screws . Dovetail locking screw . Polar scope cap

Q: 5. can you point me to a telescope to use with this package? thank you

A: Hello. I would recommend a small diameter refractor, such as an Orion. You must consider the weight of the telescope because the capacity of the guider is limited. For heavier scopes, such as the smaller SCTs, I would purchase the 1 kg counterweight. I'm currently using a Canon DSLR with a 200 mm telephoto lens + 1.4x extender and use the counterweight to minimize torsion stress on the guider.

Q: 6. 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.

Q: 7. Most telescope mounts rate the load to include the expected counterweights (without showing the additional mass in the load rating). Since this mount is also for camera/lens, does its rated load the absolute max? This is significant because the moment arm on the counterweight needs to be equivalent to the moment arm of the scope and accessories, and that can double the final load.

A: I bought this item for deep sky astrophotography. It is rated for 11 pounds, but for photography this is not realistic. With a wide angle lens on a light load it works very well. For heavier lenses it is very poor. I had 8 pounds with 300mm focal length, perfect alignment and excellent balance, and it in unable to consistently produce pinpoint stars at exposures over 10 seconds. At 30 seconds to a minute the keeper rate drops to 30% with pinpoint stars in only about 10% of images. I would not recommend this unit for photography. For a telescope and viewing it might be sufficient, but not if you want to do any exposure with long/heavy scopes or lenses. Hope this helps.

Q: 8. What else do I need to buy to be able to do Ap with long exposures? 5 min

A: People mentioned a ball head. I don't have one and wish I did with this tracker. Also, for aligning with Polaris, being able to keep my tripod stationary and spin the tracker on top would make it SO much easier to align. These are my two suggestions. Get the wedge too, that's a must.

Q: 9. In the image, is the tripod extension (black pc) included?

A: The Sky-Watcher Star Adventurer GTi Head Kit (Head Only, Skywatcher part #S20590) does not come with the tripod. Here is the link for the kit with the tripod and the pier extension (the black piece, Skywatcher part #S20595): https://bhpho.to/3MjW7lv

Q: 10. Which plate will my Sony Alpha A7RIV or A7RV require to adapt to dovetail?

A: The original Star Adventurer and 2i included the "Sky-Watcher Star Adventurer Ball Head Adapter", which worked with any DSLR or mirrorless camera: bhphotovideo .com /c/product/1092110-REG/ I have a Tamron 150-600mm lens with arca-swiss compatible grooves, if it doesn't work when I get this tracker, I'll tell you, I guess you have to get a Vixen type (V-type) dovetail plate to DSLR.