Are you getting confused by the different types of glass used in refractor telescopes that are available today? Well, I was too so I did some research. The biggest challenge when building refractor telescopes is to reduce or completely eliminate chromatic aberration which creates 'false' colors when observing or photographing the night sky. In order to do so, good quality refractors use extra low (ED; FPL-51/FK61) or super-low dispersion (SD; FPL-53/FPL-55?FCD-100) glass types. Low-dispersion glass is paired with two or more other glass elements to reduce or eliminate chromatic aberration. The number of glass elements, as well as the type of spacing used, and the build quality of a refractor telescope, ultimately determine whether the telescope is truly free of false color (apochromatic).

Read my somewhat more serious blog about this topic here:
[ Ссылка ]

Join this channel and buy me one cup of coffee per month:
[ Ссылка ]

I'm producing FREE content about astrophotography and space. Any SUPPORT is greatly appreciated! You can support me as follows:

1) Donate (PayPal): [ Ссылка ]
2) SUBSCRIBE to my YouTube channel: [ Ссылка ]
3) Visit my website: [ Ссылка ]
4) Buy some of my merchandise on my website: [ Ссылка ]
5) Use one of my *affiliate links below to buy your Astrogear at your preferred shop. I get a small percentage to keep my YT channel and website going, and you pay the same price.
- Astroshop (EU): [ Ссылка ]
- OPT (USA): [ Ссылка ]
- Amazon (worldwide): [ Ссылка ]

Any support you can give is highly appreciated, thanks!

You can also find me here:
[ Ссылка ]
[ Ссылка ]

свернуть