ZWO Filter Mask for 7x36 EFW

These ZWO Filter Masks come with M2 screws for attachment to 7-Position EFW Electronic Filter Wheels for 36 mm Filters. Here are some detailed instructions regarding how to achieve this:

• Remove the screws securing the back cover and remove the back cover.

• Place filters in their filter positions.

• Use the included M2 screws and masks to secure the filters in place.

• Replace the back cover and tighten the screws.

• Heating band for use with Orion Dew Zapper Pro 4-Channel Dew Prevention System and medium aperture telescopes
• Sized to fit 150mm (6") to 203mm (8") telescope optical tubes to prevent dew accumulation from disrupting view quality
• Features 6' cable with right-angle connection for snug fit
• Made in the U.S.A.
• Requires Orion Dew Zapper Pro 4-Channel Dew Prevention System Control Module (sold separately) for operation

تابع القمر عندما يكبر ويذوي خلال مسار الشهر القمري وتلمس طريقك على سطحه الرائع من الفوهات البركانية. إن دليل مراقب القمر عن دار فيليب للنشر يحتوي مذكرة يومية معمقة تخبرك متى تبحث وعن أية ملامح. ترافق النص خرائط مفصلة ، تمكنك من التخطيط لاسكتشافاتك الخاصة للقمر. المخططات الملونة والصور القريبة المذهلة والنص المباشر تفسر أصل ومظهر الانواع المختلفة لملامح سطح القمر

Optolong L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.

• Isolates emissions of nebulae into H-Alpha and OIII
• Compatible with DSLR, color/monochrome CMOS, and CCD cameras
• Muli-layers of anti-reflection coating
• High density sponge carton lining

• The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas.
• Isolates H-alpha, H-beta, and Oxygen iii Nebula Emission Lines
• The bandwidths are 24nm for OIII and H-beta, and 10nm for Ha
• Maximum Transmission of up to 90%

• Inspire young stargazers with this beautifully illustrated children's astronomy book
• Join our astronaut guides on a tour through the Solar System and beyond
• Learn about constellations and the mythology behind them
• Amaze friends and family with fun astronomy facts
• 48 pages packed with colorful illustrations, seasonal star charts, and interesting information all about space and the stars!

The Celestron USB cable is compatible with all Nexstar controllers. It enables control of your mount from PC, Mac, or StellarMate. Simply connect the RJ9 plug to the RS232 port on the Nexstar handset and then connect it to your device via USB. You can use any planetarium program (e.g. KStars) to control the mount to slew to any object.

1.Plug: 12v DC (5.5mm DC
plug) to 5v type c
2.Cable: UL 2464 20awg/2c
3.output: 5V 3A
4.Cable length: 2M
5.Color: Black
6.Pure copper

• An indispensable reference guide for observing the "Red Planet"
• Identifies Martian features using classical albedo and modern nomenclature
• Second Edition lists Mars opposition and observable conjunction events from 2020 through 2026
• Recommends best filters for visual observation and astrophotography of Mars
• Plastic-laminated for durability, measures 25.25" x 11" when fully unfolded, and folds up to 8.5" x 11" for easy portability

• The meticulously detailed MoonMap 260 is a must-have for any backyard astronomer
• Map identifies over 260 lunar features including craters, valleys, ancient lava flows, mountain ranges, all successful US and Soviet lunar mission landing sites, and more
• Conveniently laminated for protection against dew, dirt, and the elements
• Measures 25.25" x 11" when fully unfolded, and folds up to 8.5" x 11" for easy portability
• Includes both correct-image and reversed "mirror image" maps of the Moon for easy use with binoculars, unaided eyes, or any telescope

• An ideal reference for observing ringed Saturn and its brightest moons
• Identifies atmospheric features of Saturn using standard nomenclature
• Updated Second Edition lists Saturn oppositions and observable conjunctions from 2020 through 2026, and shows ring inclination at opposition for each year
• Recommends best filters for visual observation and astrophotography of Saturn
• Plastic-laminated for durability, measures 25.25" x 11" when fully unfolded, and folds up to 8.5" x 11" for easy portability

ZWO Finder Shoe measuring 32 mm in width by 11 mm in height with a 60º angle. This dovetail base is included as standard equipment when you purchase the ZWO Mini Guide Scope. Offered here as an extra or standalone replacement.

المؤلف : د فهد العوضي

وضع كتاب مبادئ علم الفلك ككتاب لطلبة العلوم والتربية الخاصة في كلية التربية الأساسية التابع لهيئة العامة للتعليم التطبيقي حيث يشرح الكتاب أساسيات علم الفلك مثل قوانين الميكانيكا العامة والفلك وقانون الجذب العام لنيوتن وقوانين كيبلر المتعلقة بحركة الكواكب المجموعة الشمسية.

يسلط الكتاب الضوء على إسهامات بعض علماء الإسلام وإنجازاتهم التاريخية لعلم الفلك، بالإضافة إلى أبرز إنجازات علماء العصر الحديث.

This small but powerful device (in short PPBADV) is a welcome addition to our Powerbox product series. Proudly stands between Pocket Micro and Ultimate Powerbox v2. It has been designed to provide more advanced features than Pocket Powerbox Micro and especially a USB Hub that accepts up to 4 USB ports.

Svbony SV118 1.25'' 2x achromatic metal barlow lens for astronomy telescope  

• The QHY294M camera has an 11.7 Megapixel, 4/3-inch, back-illuminated, cooled, monochrome CMOS sensor.
• On-chip binning has been unlocked.
• Short back of focus of 11.5 mm.
• The optical window has a built-in dew heater and the sealed CMOS chamber.
• The QHY294M has an internal 256MByte high-speed DDR3 image buffer.
• Fast 16.5 frames per second at high resolution (11.7 MP) with 14-bit A/D.