Good focal reducers for Quark?

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Brett
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Good focal reducers for Quark?

Post by Brett » Tue Jul 28, 2015 1:54 pm

There are a couple of cheap brand focal reducers on the market to use with the Quark, but are there any reducers that will be better in terms of dispersion and spherical abberation that would go well with the Quark and a cmos camera? Also, would a 1.25 inch or 2 inch reducer be better fitted to the Quark?

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grimble_cornet
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Re: Good focal reducers for Quark?

Post by grimble_cornet » Tue Jul 28, 2015 10:22 pm

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Valery
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Re: Good focal reducers for Quark?

Post by Valery » Wed Jul 29, 2015 7:39 am

There are really no good reducers for Quark. Most of them are just a achromat doublet lenses with their own
sets of aberrations. The worst are field curvature, field astigmatism and spherical aberration.

I noticed that if I focus the system for the center, then field edges are softer and wise versa.

And the slower the telescope you do use with Quark, the better a given reducer works - as expected.



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Astrograph
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Re: Good focal reducers for Quark?

Post by Astrograph » Wed Jul 29, 2015 5:11 pm

As I have told many customers, the cheap reducers are not made for tele-centric beams like the Quarks. The only one I know of is the Baader 0.7x Tele-compressor. These are not cheap (£209) but work. They have 2" threads. Unfortunately they are very hard to get hold of

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marktownley
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Re: Good focal reducers for Quark?

Post by marktownley » Wed Jul 29, 2015 5:56 pm

I have and use the Baader Solar Telecompressor. It is great and shows none of the uneven field illumination, curvature and softness towards the edges like the cheapy 0.5x version I first tried. I whole heartedly recommend it.
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Dennis
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Re: Good focal reducers for Quark?

Post by Dennis » Thu May 02, 2019 7:39 pm

Hi,
what about this for the Quark? anybody tried the daystar 0,5x / 0,33x reducer with 4 lenses? sounds like a relevation for Quark users..

https://www.astroshop.de/flattener-korr ... r_0_select

skyhawk
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Re: Good focal reducers for Quark?

Post by skyhawk » Fri May 03, 2019 12:36 pm

grimble_cornet wrote:
Tue Jul 28, 2015 10:22 pm
This might be of interest: http://solarchat.natca.net/viewtopic.ph ... al+reducer


Link does not work please check it when posted thanks
Just for info, if I ever come over as "blunt" or upset it is not intentional, I am AUTISTIC, I have Aspergers, and ADHD, Autism, so my apologies if I ever sound, unintentionally confrontational. Thank you

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Dennis
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Re: Good focal reducers for Quark?

Post by Dennis » Fri May 03, 2019 3:09 pm

the link works fine for me..

here is another one:

https://www.bhphotovideo.com/c/product/ ... 0_33x.html

but can also be found on google: "daystar reducer 0.5x"

skyhawk
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Re: Good focal reducers for Quark?

Post by skyhawk » Sat May 04, 2019 8:41 am

Many thanks

Looks good but a high cost
Just for info, if I ever come over as "blunt" or upset it is not intentional, I am AUTISTIC, I have Aspergers, and ADHD, Autism, so my apologies if I ever sound, unintentionally confrontational. Thank you

Esprit 120mm triplet refractor
Celestron Evolution Edge HD 8"
72mm Ed Skywatcher for Solar

SkyTee 2
Sky-Watcher SolarQuest
Gitzo Systematic Series 5

ASI 178MM
Daystar Quark Ha
WO Binoviewers
Many eyepieces 2"

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