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Best Focal Reducer for Meade 2120 (Old 10" SCT)

astrophotography cassegrain Meade optics SCT
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#1 Mduehmig

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Posted 19 February 2019 - 10:06 AM

Hi. I am about to inherit a 30ish year old Meade 2120. I'm going to pick it up this weekend. Fingers crossed for good condition. 

 

I am getting more and more into astrophotography and naturally want to be able to knock down the focal length of this monster for larger objects. So, I'm planning to order a f/6.3 focal reducer. I've read many great threads about them here but most discuss the pros and cons of using a focal reducer in general. And most people seem to use the Celestron. So my question is;

 

Can I use Celestron or any brand on my new Meade?

They all seem to be within about $30 of each other, which is "best?"

Is the f/6.3 really the only option or are there some that will even stop down the focal length more? I can fix the vignetting later...

 

Thanks in advance!

Mark

 

 



#2 Ishtim

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Posted 19 February 2019 - 10:28 AM

There are others that may be applicable depending on your intended use...

For example Meade also has an f/3.3 version, but its usefulness is limited to small imaging sensors.

Do you have a camera you want to use on your scope?


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#3 DuncanM

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Posted 19 February 2019 - 10:43 AM

Good all round reducers: Starizona SCT reducers:

 

https://starizona.co.../focal-reducers (last two items)

 

which are much superior to the Meade/Celestron F6.3 reducers.

 

Optec also has series of reducers suitable for "classic" SCTs:

 

https://www.optecinc...compressors.htm (much data is availble here on SCT reducers in general)

 

 

In all cases it's a good idea to study the specs especially the maximum camera size that the reducer is designed for.


Edited by DuncanM, 19 February 2019 - 10:55 AM.

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#4 Mduehmig

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Posted 19 February 2019 - 11:54 AM

For example Meade also has an f/3.3 version, but its usefulness is limited to small imaging sensors.
Do you have a camera you want to use on your scope?

 

Viking,

 

I do. I'm using a Nikon D3X which has a full frame sensor. I'm guessing I'd only be using the middle section of the sensor?

 

Mark



#5 Mduehmig

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Posted 19 February 2019 - 11:55 AM

In all cases it's a good idea to study the specs especially the maximum camera size that the reducer is designed for.

 

Thanks Duncan! I'll check out these links!

Mark


Edited by Mduehmig, 19 February 2019 - 04:27 PM.


#6 tomwall

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Posted 19 February 2019 - 01:51 PM

I have and old Meade 10" SCT and an 8" Celestron SCT. From what I've read the Meade and Celestron reducers are fairly equal. Check this with others first. Some people use a 6.3 in combination with a .5 reducer. For examples of how well this works, I'd suggest watching this guys observing sessions. He uses this mix to achieve an f3.3 fr.

 

https://www.youtube....9zLyvaQIGrdaDHg

 

Good Luck

 

Tom


Edited by tomwall, 19 February 2019 - 08:41 PM.

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#7 Mduehmig

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Posted 19 February 2019 - 04:29 PM

Some people use a 6.3 in combination with a .5 reducer. For examples of how well this works, I'd suggest watching this guys observing sessions.

 

Which guy Tom? Did you mean to put in a link or a CN member?

Thanks,
Mark


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