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Focal Reducer For a 150 Mak Cass

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10 replies to this topic

#1 drcsurf

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Posted 04 December 2020 - 05:55 AM

Hey guys. I'm sure this has been asked before but I'm gonna ask it anyway.

 

I have an Orion 150 Mak Cass and I'm currently using it for visual and AP. Is there anybody that has used a focal reducer on theirs? I thought i heard somewhere about the Antares .63 being ok for maks and AP but again that's why I'm asking. Any info or recommendations would be great. Thanks!



#2 Tapio

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Posted 04 December 2020 - 06:03 AM

I guess you need just a reducer and not flattener (because you already have flat field).

Harder to find these (and Antares f/0.63 reducer might not be good choice).

https://www.cloudyni...assegrain-otas/

 

Your scope is f/12 so even with a reducer it still is a pretty 'slow' scope.



#3 photoracer18

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Posted 04 December 2020 - 04:29 PM

Intes made a 0.6x one for their moving primary MCTs a number of years ago although they are very rare (I have one only because I worked for a dealer). I have never used an SCT one but it will probably work depending on the resulting flat field size. One reason the Intes one would be better is it does not need to flatten the field.

Well F7.5 with the SCT one is still better than F12.



#4 SeattleScott

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Posted 04 December 2020 - 05:29 PM

I have used the Antares. Works for visual. Not sure about edge defects with full frame cameras or such.

Scott

#5 wizer

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Posted 04 December 2020 - 06:49 PM

I also have the Antares .63x. Seems to work fine for visual. I actually got it to see if there was any potential AP use for my Meade 150mm Mak-Cass. I havent been happy at all with it for AP, yet this likely has nothing to do with the FR.


Edited by wizer, 04 December 2020 - 06:49 PM.


#6 drcsurf

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Posted 05 December 2020 - 02:05 AM

Appreciate all the replies. I know my mak is slow and not ideal for AP but its all i have for the time being so i want something to help make it a bit faster. I have imaged M31, M42, and M33 with decent results but of course not optimum results. I'll see if i can find that Intes reducer. If not, looks lke it will have to be the Antares. 



#7 drcsurf

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Posted 05 December 2020 - 02:12 AM

But those cheaper 1.25" EP reducers might work as well



#8 wizer

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Posted 05 December 2020 - 03:18 AM

The common answer of course is that the Mak would be too slow for AP. As you though, I certainly tried and wouldnt suggest its a complete waste of effort if its what you currently have.

 

My images with the Mak had a lot of vignetting, and the images were just not sharp. As I mentioned though, unsure how much of this is due to the scope (and maybe I just have a poor scope optically) and how much is due to the FR. With the FR, it makes the scope faster than the native f/10 of a SCT. And people image with that! smile.gif



#9 Tapio

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Posted 05 December 2020 - 04:55 AM

If you can't find Intes reducer this might be good alternative:
https://www.tolgaast...sor-ccdt67.html



#10 drcsurf

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Posted 07 December 2020 - 10:23 PM

Got lucky and found a guy willing to part with an Intes .55

Appreciate all the help and info!

#11 luxo II

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Posted 14 December 2020 - 02:10 AM

I use a 0.5X reducer from TS, it seems to be fine, resulting in f/6 for my 6” and 10”...


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