Baader multi-purpose coma corrector

Post by **acc** » Tue Aug 17, 2010 5:53 pm

Anyone has experience using one with a 20mm or above eyepiece in a F5 reflector? How does it perform?

rlow · Post by **rlow** » Tue Aug 17, 2010 8:44 pm

Check with Wxg, he used the mpcc in his R200ss

Post by **weixing** » Tue Aug 17, 2010 10:00 pm

Hi,
I'm using a Pentax XL 21mm with the MPCC on my F4 Vixen R200SS... look ok in my standard, but you must get the spacing right which is quite troublesome if you got eyepieces of different field stop position. Also, most review said that the MPCC is not good for high magnification (I never test it as I don't use it for high magnification), so I think it still better to just get the Televue Paracorr for visual on fast Newtonian.

Have a nice day.

Post by **acc** » Tue Aug 17, 2010 10:16 pm

Thanks guys.

Yes I did read about how it is not suitable for high mag but I intend to use it only on my 28mm UWAN which happens to not require any adaptors to achieve the right spacing. Weixing, how well do you find the MPCC in correcting coma? I can't get the paracorr as the paracorr + UWAN combo will topple my portaball.

rlow · Post by **rlow** » Tue Aug 17, 2010 10:52 pm

Well... we did try out once with the mpcc vs paracorr on the r200ss, and the paracorr gave slightly better optical performance. Compared with mpcc, the paracorr is easier to use too, as Wxg stated.

Some people find that they do not require coma correction on their f/5 dob, but for some eyepices and targets on my f/5 dob, I find the paracorr improves the view, and I do use it. Do note that your view may vary.

Post by **weixing** » Tue Aug 17, 2010 11:07 pm

Hi,

acc wrote:Thanks guys.

Yes I did read about how it is not suitable for high mag but I intend to use it only on my 28mm UWAN which happens to not require any adaptors to achieve the right spacing. Weixing, how well do you find the MPCC in correcting coma? I can't get the paracorr as the paracorr + UWAN combo will topple my portaball.

You mean the distance is correct when you screw in the MPCC on your 28mm UWAN eyepiece filter thread??

Hmm... can't remember how good does the coma correction visually on my F4, but the coma correction look good on the image I took.

By the way, I can pass you my MPCC for you to test lor... I don't need it at the moment as my scope is in separated mode... [smilie=sweetdrop.gif]

Please note that my MPCC is the old version, so it cannot insert into the drawtube of the focuser. As a result, some scope might not reach focus. Let me know.

Have a nice day.

Post by **acc** » Tue Aug 17, 2010 11:09 pm

Yes apparently the mpcc is at the correct distance when screwed into the UWAN. Okie will contact you; thanks!

orly_andico · Post by **orly_andico** » Wed Aug 18, 2010 9:32 am

but the MPCC is also usable for photography right? AFAIK there is a separate version of Paracorr for photo use..

cloud_cover · Post by **cloud_cover** » Wed Aug 18, 2010 9:35 am

The MPCC will not affect the f ratio and provides an additional 10mm of back focus, for what its worth.
Its also cheaper than the paracorr

Canopus Lim · Post by **Canopus Lim** » Wed Aug 18, 2010 12:41 pm

Since it is just used for the 28mm eyepiece I would think the Baader corrector suffice as the eye will not be able to resolve the Airy Disc. Since there will be some spherical aberration from the corrector, it will not really impact the image on-axis since it is beyond the eye's ability to discern the difference.

For higher magnification and frequent changes of eyepieces, Paracorr is recommended.