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Old 26-02-2013, 03:29 PM
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Baader MPCC Mark 3

Hi,

Has anyone used the MPCC mark 3 version for imaging?

I have a 10inch F4 reflector and use the MPCC and it works well, but reading the description on improvements made on the M3, I'm tempted to try it out.

http://www.baader-planetarium.de/sek...cc-mIII-en.pdf

Any test reports would help

Cheers
Alistair
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Old 26-02-2013, 03:57 PM
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I have had two(one for a mate) for a while now but sadly have had no chance to use one. I'm hoping to do a side-by-side with the mkII when time permits. The mkII still had a very small amount of coma at the corners of an APS-c frame at f3.9
The mkIII is supposed to produce tighter stars too.
We will see, eventually.
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Old 26-02-2013, 09:17 PM
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Hi,
It will be good to see the difference.
I was a bit surprised to see that my MKII works really well even at 58m as opposed to 55mm.
one plus on the MKIII would be the 44mm clear aperture as opposed to the 38mm of the MKII. not sure if that would reduce vignetting on an F4 and if so, by how much.
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Old 27-02-2013, 11:14 AM
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Quote:
Originally Posted by alistairsam View Post
...
one plus on the MKIII would be the 44mm clear aperture as opposed to the 38mm of the MKII. not sure if that would reduce vignetting on an F4 and if so, by how much.
Yes it has 44mm clear aperture at the front, however it still has 38mm at the back to suit the M42 T2 thread, tho I'm not sure whether this will be an issue.
Infact, I measure the new mkIII as slightly narrower than the old at 37.75mm vs 38.05mm
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Old 27-02-2013, 11:54 AM
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Hi Simon,

isn't the T2 nosepiece / thread removable as in this pic?
this is the side that would face the camera.
http://www.alpineastro.com/optical_a..._ExplodeLg.jpg
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Old 27-02-2013, 12:25 PM
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Quote:
Originally Posted by alistairsam View Post
isn't the T2 nosepiece / thread removable as in this pic?
Oh! duh! hahaha
Upon further investigation, yes, yes it is!
I knew the stopper ring was removable, but not the T-ring.... cheers!

Note that it was VERY tight and at one point when it wouldn't budge, I had my doubts.

Last edited by MrB; 27-02-2013 at 12:42 PM.
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Old 12-03-2013, 01:26 PM
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Got one from the TS-Shop last week so should be receiving soon and will post some shots with my small 5" Newt when done. I'm interested in seeing if they've improved their elements coating. I used to get some internal reflections with the older model and the field was corrected probably close to 98% but not 100%. I see the spacing is the same so it should fit my old adapters. Just swap and go. It's also a little cheaper than the previous model when it first came out.
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Old 16-03-2013, 10:55 PM
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Interesting read, all; as I've yet to try my new MKIII yet ? used to borrow an older one (not sure if a I or II, Prob a I) with the 8" F/4, which still left very minor coma at the extreme edge of frame !

I just now also removed the Stopper and 'T' rings, as a matter of curiosity, but then the other thread left on the MPCC MKIII does not match the Dlsr T adapter thread, this also are interchangable as there are three grub screws which hold it in place, therefore, can remove it and change to another with matching thread size ? (I assume) why else would they come out, one thought was, that its holding the lens in place, not much else there holding the lens ?

BTW, Not sure if you guys are using Dslr's or ccd's, the latter may also have interchangable thread options ?

Anyway, I also attempted to mount the MPCC with out the thread in the Dslr T, and secure it with the three grub screws, but they only bite on the very edge of the MPCC, there is a small lip there, but the grubs dont get behind it, Lol ,, besides, prob not good practice, clamping down on an alluminium lens assembly in three places, undue concentrated pressure might stress or worse still, crack the lens : )
Also, Taking the mpcc T-ring off, will alter the distance of the corrector lens to the chip, only a few to 5mm, in this case, not sure if this is critical tho ? ?
Just some thoughts ,,

Last edited by astronobob; 16-03-2013 at 11:07 PM.
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Old 17-03-2013, 03:01 AM
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Quote:
Originally Posted by astronobob View Post
I just now also removed the Stopper and 'T' rings, as a matter of curiosity, but then the other thread left on the MPCC MKIII does not match the Dlsr T adapter thread
It is an M48 thread. I believe it is the 2" filter thread, originally intended to allow you to screw 2" eyepieces directly to the mkIII... in which case one of these EOS adaptors should work.
However, a 2" filter thread is M48 x 0.75mm pitch, I have a set of thread pitch gauges here and the M48 thread on the mkIII has a best fit on the 0.6mm pitch gauge. I am not sure what to make of this. I have also read elsewhere of M48 x 0.6mm used for 2" filter thread.
I do not have anything else at hand this size to try it with, so if you do, be very careful... if you feel any resistance, don't force it.

Quote:
Also, Taking the mpcc T-ring off, will alter the distance of the corrector lens to the chip, only a few to 5mm, in this case, not sure if this is critical tho ? ?
Yes it is critical. The lens to sensor distance is 55mm +/-1mm, which doesn't sound too critical with a 2mm range, but I have read of people "fine-tuning" this distance with spacers to get optimum correction, suggesting there is a sweet-spot.
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Old 19-03-2013, 11:27 PM
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Thats great info thanx Simon
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