Reducing CA to a minimum in BIG APERTURE REFRACTORS

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AGMI
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Reducing CA to a minimum in BIG APERTURE REFRACTORS

Post by AGMI »

How to reduce chromatic abberation in 120mm and bigger aperture scope..well some will not like this idea but it seems a stopper ring works..like in your scope is 120mm, you can stop it down to 100mm. only some light loss but seriously it works and after that, you can use a minus violet filter.
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weixing
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Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
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Post by weixing »

Hi,
How to reduce chromatic abberation in 120mm and bigger aperture scope..well some will not like this idea but it seems a stopper ring works..like in your scope is 120mm, you can stop it down to 100mm. only some light loss but seriously it works and after that, you can use a minus violet filter.
The light loss is not a bit, it is a lots... around 30% light loss!!! I don't think anyone will buy a 120mm refractor and use it as a 100mm refractor... than might just get a 100mm refractor. The better way is to get a Chromacor to convert your 120mm achromat refractor to a 120mm APO!!
:k-happy:

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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swee sin
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Post by swee sin »

i don't think Chromacor can "convert" achromat to APO! maybe just up to near APO quality level. :D correct me if i'm wrong.
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weixing
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Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster

Post by weixing »

Hi,
i don't think Chromacor can "convert" achromat to APO! maybe just up to near APO quality level. correct me if i'm wrong.
Yes, I also think it'll not convert your achromat refractor to a real APO... but it should be near enough and should be better than those low cost APO... :)

Have a nice day.

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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MooEy
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Post by MooEy »

there are many ways to take care of CA, but cost is another story. few feel the need to spend that crazy usd6k to buy a 6" apo.

~MooEy~
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