5 or 6 inch achromat refractor performance

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Canopus Lim
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5 or 6 inch achromat refractor performance

Post by Canopus Lim »

Has anyone of you used a 5/6 inch achromat refractor before? How does the sharpness compare with SCT or reflector of similar aperture (ignoring the chromatic aberration)? Also, has anyone used the violet reduction filters to help minimize the violet halo and how does it perform on such achromats?
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VinSnr
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Re: 5 or 6 inch achromat refractor performance

Post by VinSnr »

Canopus Lim wrote:Has anyone of you used a 5/6 inch achromat refractor before? How does the sharpness compare with SCT or reflector of similar aperture (ignoring the chromatic aberration)? Also, has anyone used the violet reduction filters to help minimize the violet halo and how does it perform on such achromats?
I think we will have to wait for WX 120mm. I will be very interested to try them out.
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kochu
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6 inch refractor

Post by kochu »

Performance of 6 in refractor.

I have a 6 inch Celeston refractor and the sharpness and contrast of images is a shade better than SCTand SN . On bright images of planets the CA is present, but by using VR (I think the one I got is minus violet, not sure) filter the CA reduduces to a tolerable level.

Unfortunately so far I did not get any suitable opportunity for imaging using my C6.

Kochu/8-11-05
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Canopus Lim
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Post by Canopus Lim »

What is your refractor's f ratio?
AstroDuck
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weixing
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Post by weixing »

Hi,
What is your refractor's f ratio?
You mean kochu C6... it is f8.

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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VinSnr
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Re: 6 inch refractor

Post by VinSnr »

kochu wrote:Performance of 6 in refractor.

I have a 6 inch Celeston refractor and the sharpness and contrast of images is a shade better than SCTand SN . On bright images of planets the CA is present, but by using VR (I think the one I got is minus violet, not sure) filter the CA reduduces to a tolerable level.

Unfortunately so far I did not get any suitable opportunity for imaging using my C6.

Kochu/8-11-05
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Kochu, any chance to bring it out for me to view through it?
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kochu
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Joined: Tue Sep 30, 2003 9:51 pm
Favourite scope: Sharpstar-107PH Triplet.
Location: Jurong West

C6

Post by kochu »

No Problem Vincent . I will bring it when I meet you to collect the Diagonal or during this week-end if sky clears a bit.

Kochu/9-11-05
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