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False colour visual tests on 5 apos

Highburymark
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Deadlake

Deadlake

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The other trick to bear in mind is that a scopes performance will change with temperature, performance  can vary with temperature something that an optical bench measurement does not capture. In addition the early TOA’s would pinch the lens with a fast temperature change until Takahashi resolved the lens cell design issue.

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Highburymark
Highburymark

I have owned five apo/semi-apo refractors over the past decade. From the start, I’ve subjected them to the same rudimentary visual tests, one of which is to determine how well they control false colou

Stu
Stu

Interesting comparison @Highburymark. A smaller aperture will always show less false colour than a larger one so I guess the 60ED with fpl-53 glass can be expected to perform well. The 80ED being wors

Mr Spock
Mr Spock

The TSA 120 is a real beauty. I wonder how good the 150mm is? When I get my lotto winnings I'll let you know 😜 With my 102mm Starfield f7 ED fpl-53 I've yet to detect any false colour. The moon i

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