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Lens Difference.


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Hi I have a Sky watcher.  D=120  F= 600 mm also a Helios.  D= 120 F = 1000. Most likely made by the same Manufacture's.  Will the the Lenses be the same in both scopes ? I ask because the Helios lens is damaged and the Sky Watcher has some C A. I would like to put the Sky watcher Lens in the Helios if it's possible.  

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Hi, I’m a bit confused, why do you want to put the Skywatcher lens in the Helios tube? You’d have to shorten the tube considerably I think and the Skywatcher objective lens would not perform any better. Have I missed something? 

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1 hour ago, Sheffield Col said:

Hi I have a Sky watcher.  D=120  F= 600 mm also a Helios.  D= 120 F = 1000. Most likely made by the same Manufacture's.  Will the the Lenses be the same in both scopes ? I ask because the Helios lens is damaged and the Sky Watcher has some C A. I would like to put the Sky watcher Lens in the Helios if it's possible.  

How is the Helios lens damaged? An edge chip, for example, may not affect performance much if it is blacked out.  David

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On 07/01/2023 at 12:05, dannybgoode said:

To expand a bit on Robert's response. No, the lenses will not be the same as the focal lengths of the two scopes are different so they'll have different properties to get the light to focus at a different point :)

That's why I posted, I wanted to know if the lenses' were different.  Cheers. 

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22 hours ago, Sheffield Col said:

Is it possible to buy a lens to suit my D=120 F= 1000mm. ? 

Sadly no...at least not new anyway.  You’d be better off buying a complete scope, 2nd hand.  

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