ฟิล์มฟิลเตอร์ส่องดวงอาทิตย์ Thousand Oaks Optical Solarite Filter Sheets ขนาด 8.5x11" (216x279mm), OD 5.0

• ฟิล์มคุณภาพสูงระดับโลก ในรูปแบบที่ให้มือสมัครเล่นสามารถนำไปทำฟิล์เตอร์ส่องดวงอาทิตย์ด้วยตัวเองอย่างง่ายๆและปลอดภัย ในราคาประหยัด
• ใหม่! รุ่น Solarite คงคุณภาพของภาพของรุ่นกระจก + จุดแข็งที่เหนียวและเบาของ polymer เข้าด้วยกัน จึงมีความคงทนมากที่สุดรุ่นนึงในตลาด
• กรองแสงดวงอาทิตย์ที่จะเข้าสู่หน้ากล้องได้ 99.999% หรือ 1/1000 ของ 1% (Optical Density 5) เหมาะสำหรับใช้สังเกตด้วยตาและการถ่ายภาพ
• วัสดุฉีกขาดยาก ทนต่อการเป็นรูหรือรอยขูดขีด น้ำหนักเบา ไม่ต้อง rebalance กล้องหลังสวมใส่
• คงสีเหลืองส้มของดวงอาทิตย์ตลอดทั้งพื้นที่
• ถ้าใช้งานอย่างระมัดระวัง ฟิลเตอร์ Thousand Oaks Optical รุ่นนี้สามารถอยู่ได้ไม่ต่ำกว่า 20 ปี และอาจนานชั่วชีวิตคน
• สินค้าแบรนเนมคุณภาพจาก USA; รับประกัน 2 ปี

Made in the USA

ก่อนส่องดูดวงอาทิตย์ทุกครั้ง กรุณาปฎิบัติตามนี้เพื่อป้องกันการสูญเสีย

1. ก่อนส่องดูดวงอาทิตย์ทุกครั้ง ควรตรวจให้แน่ใจว่าฟิลเตอร์ส่องดวงอาทิตย์สามารถใช้กับกล้องได้อย่างกระชับ ไม่หลุดง่าย ถ้าจำเป็นควรติดเทปเพื่อป้องกันการหลุดออกจากหน้ากล้อง
2. ห้ามใช้ฟิลเตอร์ส่องดวงอาทิตย์รุ่นที่ติดกับ eyepiece ควรใช้รุ่นที่ติดด้านหน้ากล้องเท่านั้น มิเช่นนั้นความร้อนที่เกิดจากแสงอาทิตย์อาจจะทำลายกล้องดูดาว ฟิลเตอร์ส่องดวงอาทิตย์ และดวงตาของใช้งาน
3. ถ้าใช้กล้องสองตาเพื่อส่องดวงอาทิตย์ ควรติดฟิลเตอร์ส่องดวงอาทิตย์ที่หน้ากล้องของเลนส์ทั้งสองข้าง สำหรับกล้องนำหรือกล้องเล็ง (finderscope) ควรปิดให้สนิทและงดการใช้งาน หรือถอดออกไปจากกล้องหลัก เพราะการมองผ่านกล้องนำที่เล็งไปที่ดวงอาทิตย์มีผลเสียหายไม่แตกต่างจากกล้องหลัก!
4. ฟิลเตอร์ดวงอาทิตย์ที่ทำจากฟิล์มจะไม่หล่นแตกง่ายเหมือนฟิลเตอร์ที่ทำจากกระจก แต่ก็ควรระมัดระวังเกี่ยวกับของแหลมหรือมีคมที่อาจทำให้ฟิล์มฉีกขาดได้
5. ควรให้คำแนะนำกับผู้คนที่ใช้กล้องดูดาวร่วมกัน (เด็ก เพื่อน ญาติ หรือผู้อื่น) เกี่ยวกับข้อควรระวังในการส่องดูดวงอาทิตย์ โดยเฉพาะเด็ก การจงใจดึงฟิลเตอร์ออกเพราะความซุกซนหรือเพื่อความสนุกสนานของเด็กโดยรู้เท่าไม่ถึงการณ์อาจทำให้เกิดการสูญเสียการมองเห็นอย่างถาวร คำแนะนำก่อนการใช้งานเป็นสิ่งจำเป็น และไม่ควรทิ้งกล้องดูดาวไว้นอกบ้านตามลำพังในตอนกลางวัน!

After years of R&D we have developed a new solar film that has the optical quality of glass with the advantages of impregnated polymer. Will never develop pinholes or scratches that can let in light and ruin a filter. Other advantages: lightweight and does not require re-balancing tube assembly, will not break, consistent yellow-orange solar image, even density with any aperture, flat surface compared to other thin film filters that have wrinkles and creases. Will not tear or puncture. Stronger than any other solar film on the market. Also available in sheets.

Who said you have to be in the dark to do astronomy? Turning your telescope to the Sun is fun and educational. Watch the march of giant sunspots, the clouds of glowing vapor in the photosphere, and solar "granulation" detail. But be sure to protect your precious vision with a safe Thousand Oaks solar filter! Looking at the Sun without one, even for an instant, can permanently damage your eyes.

Solarlite: NEW (Best Value)
After years of R & D Thousand Oaks Optical have developed a new solar film that has the optical quality of the glass with the advantages of impregnated polymer (Thousand Oaks Optical Black Polymer). Will never develop pin holes or scratches that can let in light and ruin a filter. Other advantages: Light weight and does not require re-balancing tube assembly, will not break, consistent yellow-orange solar image, even density with any aperture, flat surface compared to other thin film filters that have wrinkles and creases. Will not tear or puncture. Stronger than any other solar film on the market. Also available in sheets. Guaranteed 15 years.

Each Thousand Oaks filter is mounted in an aluminum cell that slide-fits over the front of your telescope. Size shown in the chart below is the ideal diameter of front of telescope; filter will fit diameters up to 1/4" smaller with foam tape liner supplied.

CAUTION: Never look at the Sun, even for an instant, without a protective solar filter. Doing so can permanently damage your eyes.

Pinholes and Minor Scratches

Pinholes and minor surface scratches are common in solar filters, however, Thousand Oaks Optical's multi-coating technique keeps them to a minimum. A "bright" pinhole may cause "ghosting" due to scattered light. If this is seen during observation, the pinhole(s) should be blocked out. Blocking out any pinholes should be done on inside coated surface. Hold filter 1-2 feet in front of a standard 60-100 watt "soft white" light bulb. Blocking can be done with a fine point felt marker, small drop of paint, typing correction fluid etc. The touch up procedure will not degrade the optical performance. It is not necessary to touch up any small pinholes that do not cause image problems. There is no danger if some small non light scattering pinholes or minor scratches are present. All filters are tested for safety before shipment.

Frequently Asked Questions (FAQs)

ARE THE FILTERS COMPLETELY SAFE? All of Thousand Oaks Optical Glass 2+, Solarite, RG-Solar Film & Silver-Black Polymer filters are completely safe for unlimited visual use. If handled with care and common sense, all will last a minimum of 20 years to life.

DO THE ALUMINUM CELLS COME WITH THUMB SCREWS? Thumb screws may seem like a good idea, however, our extensive testing found that in most cases it's actually less secure than a felt lining which covers a lot more surface area for a secure friction fit. If the tolerance is within a few thousands of an inch such as with eyepiece holders, it would be fine, but this is rarely the case. Thumb screws can also dent and scratch the tube and put strain on the filter glass. Thumb screws are simply a "one size fits many" manufacturing shortcut and provide a false security.

CAN THE TELESCOPE OPTICS GET HOT OR DAMAGED? No, all the heat and intense light is blocked before it can enter the telescope. Your telescope may get warm from sunlight shining on it, not from the small amount of visible light transmitted through the filter.

WHAT DETAIL IS VISIBLE? Sunspots and surface granulation are the two main features. The only detail that cannot be seen with a standard filter (commonly called white light filter) are prominence and flares which require our highly specialized H-Alpha filter system.

WHY ARE THREADED CAMERA FILTERS ONLY AVAILABLE IN BLACK POLYMER? RG and Glass filters have highly reflective coatings that can cause internal reflections between the filter and camera lens since the filter and lens are in close proximity. This problem is less likely to occur with telescopes, however, mounted telescope filters can be tilted slightly to move any internal reflections off axis and out of view.

SOLAR FILTERS White Light  (580-630nm)

Printable SolarLite Filter Instructions

TECHNICAL DETAILS:

Glass 2+:  High quality hand selected glass with metallic coating on inside surface facing optics.

SolarLite Film:  Metallic coating outside surface & absorptive material within substrate.

Silver-Black Polymer Film:  Metallic coating outside surface absorptive material within substrate.

All filters block 99.999% of the energy from entering the instrument. For visual and photographic use.

IMPORTANT:

• Check the solar filter for damage before each use.
• The filter must be FIRST in-line between sun and instrument. Do not use filter behind any lens.
• Truss design telescopes must NOT be used without covering the open section of tube. Sunlight entering from the side will reflect off mirror and damage the solar filter.
• Secure filter properly. (See mounting instructions)
• Do not leave instrument unattended where a child or inexperienced adult could point it at the sun without the filter properly attached.
• Keep the finder-scope covered if not equipped with a proper solar filter.
• Point the instrument away from sun when attaching and removing solar filter.
• Do not place the filter up against a smaller instrument. The end of the tube will damage the filter.
• When looking through the focusing tube without an eyepiece, there may appear to be small defects in
• the coating that are not seen when observing through the eyepiece. This is normal and is not a coating defect or safety concern.
• “Ghosting” can occur due to internal reflections (glass filters only). If this is a problem, simply tilt the filter slightly.
• Filter may absorb solar energy and get hot during use. Use extra care when removing.

Pinholes and minor surface scratches are common in glass solar filters; however, our multi-coating technique keeps them to a minimum. A “bright” pinhole in the coating may cause “ghosting” due to scattered light. If this is seen during observation, the pinhole(s) should be blocked out. Block out any pinholes on inside surface facing telescope. Hold the filter 1-2 feet in front of a 50-100 soft white light bulb. Blocking can be done using a fine point felt marker. There is no danger if a few pinholes or minor scratches are present. The touch-up(s) will not lessen the optical performance. Small pinholes need not be blocked if not causing an image problem.

MOUNTING:

If your filter is too loose, it can be custom fitted using the extra felt included. If the paper backing is difficult to remove, dampen with water or alcohol using a wet sponge or fine spray mist. Peal backing off slowly. Let dry if necessary before installing on inside of cell. Extra felt can be added over any existing felt. Test fit before removing the backing and permanently installing the felt. We cannot exchange for another size if the felt is installed.

TIPS:

• Allow instrument and filter to equalize to the outside temperature for at least 15 minutes.
• If possible, do not view over pavement or buildings. Viewing over grass or water will help avoid heat currents that will degrade the image.
• Cover dark colored instruments with a light colored cloth.

CLEANING:

Glass: Loose dust can be blown off with up to 15 PSI. Clean with Isopropyl (rubbing) alcohol and a soft tissue. Do not use a cloth. It’s best to mist the filter with a spray versus soaking the tissue. Use a 3 inch or larger circular wad of tissue and lightly rub across surface using long strokes. Lightly wipe dry with a fresh dry tissue.

SolarLite & Silver-Black Polymer Film:  Same as glass, however, polymer is more susceptible to small surface scratches, so extra care should be taken. Surface scratches will not compromise the safety.

Please observe the following safety precautions with EVERY solar observation

1. Prior to each and every solar observation session, check the filters fit and - if necessary - tape it to prevent slipping. Never use the filter at the eyepiece, only attach it onto the front of the objective, in front of the Schmidt-plate (SC-owners) or in front of the tube of a Newtonian-telescope. Otherwise it can become dangerously hot inside your instrument and inside your eyes.
2. If you use a binocular, protect both objectives with a filter. Also make sure, that the viewfinder of your telescope is properly covered, either with foil or with the original dust cover. Unprotected views through your finderscope would have the same catastrophic consequences for your eyes as a look through the main telescope itself !
3. A filter made of film is relatively resistant to breackage in comparison to a glas filter. However, care should be taken with sharp pointed objects.
4. Emphasize the importance of caution to those observing with you, especially children. Intentionally removing or damaging the filter can endanger their eyesight. This is no place for jokes. Never leave the telescope outside unattended during the daytime ! 

CAUTION: Never look at the Sun, either directly or through a telescope, without a professionally made protective solar filter installed that completely covers the front of the instrument, or permanent eye damage could result.