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Ball Mill

Ball mill has been used in many industries for a long time, the technology is quite mature already. But there are still some problems, such as, lots of investors expressed…

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MTM Series Trapezium Mill

Raymond mill is ever one classic powder grinding machine in the past. And most of modern mill are from it and MTM series milling machine is the most successful one. It optimized…

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LM Vertical Roller Mill

Vertical Roller Mill is our newly-launched product which is applied as a solution to the technical issues such as low output and high energy consumption in the ordinary industry.…

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MTW Series Trapezium Mill

MTW Series European Trapezium Grinding Mill (MTW Raymond Mill) is developed on the basis of our experts' long-term R & D experience, structure & performance analyses of traditional…

Telescope Mirrors & Prisms for sale | In Stock | eBay

⑴ High efficiency: roller compacted materials directly onto the grinding disc, so power consumption is low. Compared with ball mill, it saves energy consumption by 30% ~ 40%. ⑵ Less wear and tear: As the roller is not in direct contact with the disc, and material of the roller and liner is high quality…

40+ Epic Homemade Telescopes (w/ How To Make Guides ...

I have posted an updated page showing my current method for fusing thinner sheets of glass together to make high-quality telescope mirror blanks. Over the last couple of years I have really perfected this method. I am can turn out as many as two blanks per week using this technique. It is easy and economical. Check it out.

Buying the Glass - Astronomy

What Focal Length and type lens do you want to build. Grinding start: Initial hogging of the glass and making grinding tools. Correcting for center and wedge: What Focal Length and type lens do you want to build. Polishing the Lens: Polishing out the lenses and notes on milling rouge. Figuring the Lens: Figuring and initial testing of the lens.

Build Your Own Lenses - DIY Photography

The Orion StarBlast II 4.5 EQ Reflector Telescope Kit is the best general-purpose telescope for novice star-gazers. It's a decent option for younger members of the family, or those showing a ...

The best wide angle lenses for astrophotography 2020 - DIY ...

Nikon, Canon, Leica, Pentax, Sigma, Tokina, and a host of other lens makers are all striving to bring you the sharpest lenses with all optical aberrations reduced to the minimum. That's too bad! Because with lenses, as with life, sometimes it's the imperfections that make things interesting. The image on the left was shot with the imperfect optics of a homemade lens. Exploring the soft, dreamy ...

CSO high accuracy Aspherical parabola primary mirror for ...

Usually wide angle tends to refer to a lens that is wider than 50–25mm. I like ton consider any lens that is wider than 35mm a wide angle. For full frame cameras, most wide angles are somewhere in the 14–30mm range, with anything wider than 14mm generally being considered a "fish eye".

Telescope Mirrors, Blanks, Secondaries, Grinding Materials ...

Telescope eyepieces that excel at both use complex lens systems of the highest quality and these do not come cheap. Using a premium eyepiece cannot always guarantee that you will see more, but using a premium eyepiece will always bring out the best in your telescope and will always make your telescope more enjoyable to use.

Diy Grinding High Quality Telescope Lens

The lens now would work, but it would have an impressive chromatic aberration. So I decided to add a solid diaphragm (cardboard ring) to reduce aberration.( wider hole = +light and +aberration, tighter hole = -light and -aberration) To increase focusing precision i tried milling a small helical rail in the maintenance joint(the part inside the pipe), and i put a screw through the outer pipe in ...

Mike's Telescope Workshop

Torricelli started his lens-making work in 1642, and it did not take him long to achieve full mastery of his craft. To this day, optical testing is still carried out on some of his remaining lenses. Making large high-quality, long-focal-length lenses was a significant task at that time.

Homemade 280mm Telephoto Lens : 6 Steps - Instructables

Amateur Telescope Making Volume 1, 2 & 3 $70AUD Build Your Own Telescope Complete plans for 5 high quality telescopes $70AUD The Dobsonian Telescope A practical manual for building large aperture telecopes $82AUD How To Make a Telescope 2nd Edition $70AUD: ALL ABOUT TELESCOPES: HOME PAGE INDEX Contact Us - [email protected]: SITE MAP ...

Telescope Eyepieces Guide: 12 Important Tips You Should Know

By the way, you can use each Alluna RC telescope at f 8,0 and with a reducer and fast f 6,0 aperture. There are no restrictions at f 6.0, the high image quality without astigmatism and field curvature are retained. The spot size In advertising Dall Kirkham are often compared with corrective lenses with the Ritchey-Chrétien without corrector.

Ask Ethan: Why Don't We Build A Telescope Without Mirrors ...

The benefits of this quadruplet-lens telescope are the lack of need for a field flattener, and the high-quality "astrograph" level focuser. Without being able to use each and every telescope on this list first hand, it is impossible for me to provide a complete review of each model.

The best wide angle lenses for astrophotography 2020 - DIY ...

Jan 22, 2013· The largest reflecting telescopes currently have objectives larger than 10 m (33 feet). The 20th century also saw the development of telescopes that worked in a wide range of wavelengths from radio to gamma-rays. The first purpose built radio telescope went into operation in 1937.

Roger's Refractor Building Page - Astronomy

Obsession Telescopes chooses to work with Optical Mechanics and Ostahowski Optics - as these two companies have proven to be reliable and responsive to the needs of our customers. We do this to insure that every Obsession Telescope customer receives the finest optics and customer support available.

Obsession Telescopes / Optics

DIY Mirror Grinding and Telescope Making. ... The last grit on the list was 5 micron. I did not use the grit that came with the mirror kit. Instead, I purchased some high quality, 5 micron "Microgrit". I wanted to avoid seizing and scratches and learned that Microgrit would help. ... Homemade Refractor Telescope Lens...from a bottle bottom. In ...

What are the best sources for mirror blanks? - ATM, Optics ...

Mar 09, 2019· Adam's DIY pinhole camera and finished zoom lens were made entirely from scratch. It's absolutely incredible to watch someone mine, extract, and melt down copper, and then use borax, sand, and soda ash, all of which Andy collected himself, to make glass, but damn...knowing that it took months of grueling work, dozens of attempts, and over 30 ...

Dick Parker's Telescope Mirror Workshop: Refractor ...

Zambuto Optical Company is a full service custom manufacturer of premium Newtonian primary telescope mirrors from 7" through 24" diameter. Special Notice-We want to let our customers know that during this timeframe we continue to do business as usual. There may be delays with regard to shipments due to outside circumstances beyond our control ...

Telescope Making Supplies

Jul 25, 2019 - Explore hemantgadkari's board "Telescope" on Pinterest. See more ideas about Telescope, Amateur astronomy, Telescopes.