SkyWatcher BKP200 (for aperture 200mm) binary hologram apotizer free shipping

Eligible models: Newtonian or Cassegrain telescopes with a 20 cm aperture and four spokes. Different apertures cannot be used. Orders for desired apertures are also available. Please contact us and we will manufacture the desired aperture.

Applicable models Reflecting telescopes such as Spyder's Cassegrain Rich-Claretin, Newton, Dobsonian, Astrograph, etc.
With instruction manual
Mounting method: neodymium magnet
Surface treatment: anti-reflection rubber paint
Warranty period: 2 years

By shifting the phase of the wavelength of light, spikes generated by the fixed spokes of the secondary mirror of Newton and Cassegrain reflecting telescopes, which were previously thought to be impossible to eliminate, can be prevented. The binary appotizer technique, which superimposes the maximum and minimum values of two nearby diffraction patterns, has been further improved to such an extent that some people wonder why telescope makers do not use it.

It eliminates telescope spikes during observation and photography, making stars appear round like in a refracting telescope. The bad diffraction caused by the spokes reduces the contrast of the telescope and increases the glare, but with this on, the glare is reduced, which in turn allows you to see previously unseen areas and stars such as double stars that are close together.

The effect of this apotizer is a 12% reduction in light collection due to the shielding of the four wings used, but it improves the dispersion caused by the diffraction ring by 30-50%, thus improving contrast and resolution more than without it. Especially in photography, the diffraction of the spider disappears and fine structures such as areas that were previously blocked can be captured.

As can be seen in the Bubble Nebula provided by AM in Gunma, the inside of the bubble can be seen more delicately, and in all the star images, the spikes have disappeared and the stars are circular. Thanks to the reduced glare, faint stars are also clearly visible.

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We received this review from Mr. KI in Shizuoka, Japan. (Aperture 150mm Skywatcher BKP150) --------------

Thank you very much for your recent creation for BKP150. I made a few adjustments to the installation. I recently observed Jupiter and Saturn. I was particularly impressed with the improved contrast of Jupiter, which was difficult to observe with the white cast of the image, but after installing this product, I was able to see the Great Red Spot. It is a wonder! I am very satisfied with this product, even though I am only an ocular photographer. I will contact you as a review of the use of this product. Thank you very much. -Thank you very much.

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We received this review from SK in Shizuoka, Japan. (Aperture 200mm Vixen RS200SS)

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When I took a picture, the diffraction of the spider was no longer visible. Thank you again for the opportunity.

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We received a review from KS in Hyogo, Japan. Aperture 250mm

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Last night, it was clear and sunny, so I did a live-action test in my yard. I photographed Antares and it disappeared almost perfectly. However, I took one frame at a time under the same conditions for comparison. The fine spikes are likely to remain on fairly bright stars, but it works well enough. Thank you very much. Please plan and sell new products again.

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We received a review from YK in Toyama, Japan. (Aperture 200mm Skywatcher BKP200)

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I am xx@Toyama, who had the BKP200 reflector made for me last time. Thank you very much. The other day, I checked the spider light stripes disappeared in the actual shooting, and I realized again how effective it is. Therefore, I would like to bid for the BKP300 and F5 reflector, which are not used as often as I would like to use them. Thank you very much.

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We received a review from UH in Saitama, Japan. (Takahashi, E180ED)

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The spikes are gone when I visually peek at them. Photography has not been done yet, but I am looking forward to the future.

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We received a review from Mr. NK in Aichi, Japan. (Aperture 350mm Skywatcher Flextube 350P)

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Sorry for the delay in reporting. I finally confirmed the effect a while ago. Indeed, the diffraction image caused by the secondary mirror support spoke disappears. Interesting! Maybe some fine tuning is still needed, but it looks like I won't have to worry about the direction of the diffracted image when observing Sirius B, etc., which I always worried about (I haven't seen it yet because of the season). Seeing was not so good today, so I will check the effect on resolution another time, but Hercules' ζ star, Antares' companion, and the scorpion's ν quadruple star were visible without problems.　I'm an old reflector telescope user, so it's odd, but I feel a little sad without the diffraction image. 。。。。

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We received a review from MM in Tokyo, Japan. (20cm aperture, Skywatcher BKP200)

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The diffraction crosses that appeared in Sirius are gone. Thank you very much.

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