OPTOLONG 1.25" 2" L-Pro Astrophotography Nebula Sky Light Pollution Filters for telescope | Инструменты

OPTOLONG 1.25" 2" L-Pro Astrophotography Nebula Sky Light Pollution Filters for telescope | Инструменты

Size

• Clip-Filters - EOS-FF(Canon full frame), EOS-C(Canon APS-C), NK-FF(Nikon full frame)， Sony-FF(Sony full frame)
• 1.25
• 2”
• Other customized size please send email to inquiry

Specifications

• Tpeak: T>90%
• Spectrum: 380-750nm
• Optical Density:  Light pollution emission is blocked 90%
• Surface Quality: 60/40
• Transmitted Wavefront RMS: λ/4
• Parallelism (arcsec): 30s

• Manufacturing Technique

  Fine-optically polishing for double-sides—— Ensure accurate λ/4 wavefront and <30 seconds parallalism over the both surfaces

  Ultrasonic wave cleaning substrate with purified water—— Cleanup by 13 purified water tank to remove inpurities and dust effectively

  Iro source assisted coating—— For durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.

  Constantly stringent quality testing processes—— Each filter was tested by spectrophotometer and laser interferometer testing spectrum and wavefront to ensure market filter is qualified product

  Optolong will spare no effort to serve our customer with outstanding quality products and best servise!

  Our vision is your astro imaging perfection.

   

  Comparison Photos

1. We accept alipay here.

please make payment directly after your winning the item. After the payment cleared, your order will be sent out within 2 business days (not including holiday and weekend) and we will send the  tracking number to your email-box.

2. Generally, it will take about 25 business days to reach the U.S.A. While it will take about 30 business days to reach E.U. But sometimes, the time will be delayed in your local customs or post office. please wait some days with a little more patience. any questions pls let us know in the first time.If there are unexpectable reasons, like customs clearance delay, typhoon, strike, holiday vacations in the passing countries/states/cities and so on, the shipping time will be longer than usual.

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Any questions pls send email to us.We will respond to your inquiry within 24hrs during business hours 9.00am to 6.00pm (Beijing Time) Monday to Saturday. If you do not receive our reply, please kindly re-sent your email and we will reply to you as soon as possible.

•We provide the products for one year warranty.

We promise you that we will check every products when we send it.and Pls us know in the first time if the products has any question within three days after you got it.

•As a responsible seller, we guarantee free exchange or full refund if item is defective. But if you are not satisfied with the goods except defective,you will bear the double shipping and handing charges to send to us.

•For any exchange or refund, we need the original receipt or a record of the purchase in our system, and the product must be in its original condition, including the box, UPC bar code, packaging, and all accessories. Or we can not receive it. 

Notice:

•We are not responsible for any custom duty or import tax. Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility.

•Serious Buyer Only! Please place bid only if you agree with all the terms.thanks for you attention!Hope we can cooperate with all the time in future! 

THANK YOU!