The B+W 58mm Cross Screen Filter 4xis designed to be used perpendicular to a point light source such as the sun, a light bulb, or a candle. Within the filter's surface is a combination of fine, etched line types that help to create a starburst effect with four primary diffraction spikes that extend from the light source.

This filter is most effective for pictures where the light source used to generate the starburst effect is a highlight with a significant degree of contrast from the rest of the image. The B+W 58mm Cross Screen 4x Filter is constructed from optical glass for clarity as well as color fidelity, and features an F-Pro brass filter ring for durability as well as jamming prevention. The filter ring can be rotated in order to adjust the direction of the diffraction spikes and overall orientation of the starburst effect.

Starburst Effect from Point Light Source    Four Primary Diffraction Spikes    Spikes Extend From Light Source    Optical Glass Construction    F-Pro Brass Filter Ring    58mm Front Filter Threads    Plastic Case

Creates a starburst effect from point light sources within an image

Starburst effect features four primary diffraction spikes which extend from the light source

F-Pro brass filter ring helps to prevent jamming and provides additional strength

Filter ring can be rotated for direction control of the diffraction spikes and overall orientation of the starburst effect

58mm front filter threads allow for use with other filters

Plastic filter case for storage and transport

Related Questions and Answers

Q: 1. What are the disadvantages of this filter compared to the Sigma Ceramic Protection Filter?

A: The Sigma Ceramic filter is basically the higher-end version of the standard Sigma 82mm protector; while the standard protector is pretty great by itself, the ceramic filter's ceramic-glass substrate has a much greater hardness value against bangs, scratches, etc., and the water-repellent coating makes it excellent during inclement weather.

Q: 2. Does 4X powermate, 2 , fits in to SCT rear cell adopter(2 ) or directly in to SCT rear cell(I have 8 SCT). In other words how do I hook up this 2 powermate to rear of 8 SCT.Second Question: I have a cannon DSLR with T ring and 2 adopter. Does this works with this?.

A: 1) The bare end of the 4x Powermate barrel does slide into the 2 adapter that screws onto the SCT rear cell.You'll need to make sure the 4x Powermate is firmly secured into the 2 adapter since the 4x Powemate is a bit heavy (especially with the camera attached!).2) No, the camera cannot be attached to the 4x Powermate by simply using a 2 adapter and Canon T-Ring.To place an SLR camera onto the 4x Powermate (unfortunately) another adapter is necessary, which is the TeleVue 4x Powermate T-Ring.The 4x Powermate has to be partially disassembled then the Televue 4x Powermate T-Ring gets screwed onto the 4x Powermate. Then, the Canon T-Ring is screwed onto the 4x Powermate T-Ring. Then the camera can be attached to the Canon T-Ring.

Q: 3. Hi can someone help me, I have Tele Vue 85 - 600mm and will connect this to a Canon 5D M4 that I have, and then insert. Tele Vue 4x Powermate (2 ") (PMT4201) + Tele Vue SLR prime focus camera adapter for 2" focusers (ACM2000) + Kowa TSN -CM2 T- Mount camera adapter ring Canon EF (CM2-CE) + Canon 5D M4. Will this work regarding focus?

A: That would be the best combination I would try.

Q: 4. Any vignetting when mounted on a Zeiss 15mm lenses on Nikon D810?

A: You may experience vignette due to the wide angle of the lens.

Q: 5. What is the equipment weight capacity for this rail?

A: You're safe up to 5 pounds. Anything more than that you might want to check with Novoflex: mail@NOVOFLEX.com

Q: 6. I have a 2x Powermate and mount it directly to the 90 degree Televue Everbrite dielectric on my TV-85 for viewing with both the eyepieces and attaching my DSLR via the Powermate adapter with T-ring. Is this how the 4x mounts as well?

A: If I undestand your question correctly, I say YES. I have used my 4x Powermate on my Meade 7 LX200 Mak-Cass with a 2 Diagonal. I dont really need that much magnification on my scope when viewing VISUALLY, why I bought it was for shooting Prime Focus using my Canon T3i DSLR. For this it performed flawlessly. Im pretty sure you are aware these Powermates are a step up from the lowly Barlow and its quite noticable once you've used both and compared the differences ! Just be sure you have the 2 adapter if you are using this 2 Powermate. Aside from that, keep looking up ! :-)

Q: 7. How do I clean this filter? I tried a fresh microfiber cloth with a little water and isopropyl alcohol, but it leaves streaks.

A: We, hIghly suggest zeiss cleaning solutions the gentle formulation is free from alcohol, ammonia, and fragrances but still cleans all devices thoroughly. ZEISS Lens Care Kit BH #ZELCK2 • MFR #000000-2127-990 https://www.bhphotovideo.com/c/product/1097470-REG/zeiss_2127990_lens_care_kit_2oz.html

Q: 8. Does this fit the Sony SELP18105G lens?

A: Yes, perfectly fitted

Q: 9. Will it affect the AF features of the lens at all?

A: This filter has no affect on auto focusing. The AF should work seamlessly when using this filter.

Q: 10. can I use 1.25" pieces with this ?

A: Yes, the Tele Vue 4x Powermate (2"), comes with a 1.25mm adapter allowing you to use a 1`.25 eyepiece with it.