| 21. | The earliest recorded working telescopes were the refracting telescopes that appeared in the Netherlands in 1608.
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| 22. | I have a 10x Loupe eyepiece which I am using to make a simple Refracting telescope.
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| 23. | He was the first American to make " very large " professional refracting telescopes.
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| 24. | The stereo camera combined the refracting stereoscope with two separate cameras which were placed slightly apart.
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| 25. | The LHO's primary instrument was a refracting telescope for its entire span of operations.
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| 26. | It also houses a five-inch solar telescope and an eight-inch refracting telescope.
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| 27. | The anti-reflective coating of the telephoto lens with 1.7 times refracting glass.
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| 28. | Binoculars are widely used by amateur telescope makers, essentially using two refracting or reflecting astronomical telescopes.
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| 29. | Refracting telescopes can come in many different configurations to correct for image orientation and types of aberration.
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| 30. | The second instrument is a Takahashi type FS-15, which is a classic refracting telescope.
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