The problem of urban illumination is becoming more and more important every year – new houses, new roads, illumination, thoughtless design of urban lighting lead to the fact that the sky turns into a solid orange canvas, and because of the bright background it is impossible to capture even bright nebulae. The situation changed dramatically after the appearance of specialized light pollution suppressor filters for astrophotography. The use of interference coatings made it possible to cut off unnecessary regions of the spectrum — for example, the emission lines of mercury and sodium lamps, and to transmit the regions of interest — emission lines of hydrogen and oxygen.
There are several varieties of light pollution filters — broadband and narrowband. In broadband filters include CLS (City Light Suppression), LPR (Light Pollution Reduction), UHC (Ultra High Contrast), UHC-S. They may be under different brands, but they have one task – to weaken the illumination of city. The UHC bandwidth is narrower in the green area, they are more suitable for heavily exposed areas, but it’s harder to get the corrent white balance. The usual bandwidth in the green region is from 20 to 75 nm. The narrower the filter, the darker the background is. Also, CLS UHC filters can pass the red region of the spectrum – this is not important for visual observation, but it is very important for photography, since the emission line of hydrogen nebulae (H-alpha) is in that area.
Perhaps there are not enough people left who have not heard about Aliexpress. The largest Internet site where you can find almost everything – from toothpicks to an airplane wing. Of course, there are also astronomical products there, and even taking into account the delivery, the cost of this or that accessory is less than what it costs in local stores. In this topic, I will try to make a list of interesting astronomical products, useful for amateur astronomers – both beginner and experienced. On aliexpress, I mainly buy small things – eyepieces, mounting plates, lights, adapter rings and much more. When buying, try to choose China Post Registered Air Mail delivery, or ePacket, even if it is paid – such packages are correctly tracked and reach faster.
Warning: I do not bear responsibility for the defective goods and can not vouch for sellers. Carefully read the reviews for the product and choose a seller with a good reputation. But even if an unqualified product arrives or with defects, for these cases there is a “dispute” with the seller (“disput”), during which you can partially or even fully return the money for goods of inadequate quality. It is advisable to remove the unpacking of the parcel on video, so that you can then make a complaint. I also recommend specifying in the comments to the order that the seller check the goods before shipping (for example, “Please check the goods before shipping. There should be no defects”.)
Enjoy the shopping!
New interesting products will be added on top.
Svbony SV182 6×30 right angle finder
Lightweight, compact, good image and most importantly, completely right image. An erecting 90-degree prism is used to break the optical axis. Recommend!
Focal Length Extension Tube Kits М42х0.75 3/5/7/10/12/15/20/30 mm thick. Metal, workmanship is excellent. Useful for selecting the focal length of an astronomical camera. Recommend!
Svbony Adapter M48-1.25″, T2-1.25″, 2″-1.25″ (optional) with quick-release soft clip.Does not leave scratches and damage on the installed accessories.Budget analog of adapter Baader ClickLock. Fixes firmly and securely.I ordered this myself for mounting the QHY5III178m camera, as there is the slope of the sensor plane with a conventional adapter.
Lightweight, compact, metal tripod Q999. I use it with a Sky-Watcher Adventurer mount and lenses with a focal length of up to 50 mm.For a 135 mm focus, preferably a tripod is stronger, but if you take a hike, where every gram of weight is important, then this one will do.Suitable also for small binoculars and spotting scopes.One of the legs is unscrewed and can work as a monopod.Includes a bag and a good ball head.Recommend!
Pocket prism spectroscope.Inexpensive plastic, but works well for its price.Suitable for testing astronomical filters.The case outside is better to glue the black opaque film, so that there is no parasitic flare.The gap is narrow (this is good).There is no enlightenment (and not really needed).Easy to understand, can be upgraded. I bought it from this seller with the delivery of an e-packet, I got it from China in 16 days.
My review: https://www.star-hunter.ru/en/simple-spectroscope-review-aliexpress/
Eyepiece 32 mm 1.25″. Inexpensive viewing eyepiece, which is useful to obtain a minimum increase.
Celestron X-Cel LX 7 мм High-quality and wide-angle (60 °) eyepiece – works great even with fast telescopes.Pleasant pupil removal (14 mm), metal body, excellent blackening is a logical replacement for the short focus plossls.Recommend!
Filter for astrophotography Svbony CLS clip EOS.It works only with Canon mirror cameras (APS-C format).Does not work with Canon EF-S lenses.Excellent suppresses urban light pollution, highlighting the nebula.When using modified cameras and lens optics, it is desirable to use an external IR-cut filter. Link: https://alli.pub/6u8rhb?erid=2SDnje5tzoz