TS-Optics 0.95x Maxfield CC back focus

[barbulo]

Hi all, 

I wonder what’s the real back focus distance for the mentioned coma corrector. 
According to their website, the “working distance” is 55mm from the stopping ring.

However, I’ve read in several sites that this CC is the same as the Sharpstar MPCC 0.95x 2” but re-branded. The Sharpstar page states that the back focus distance is 56mm. 

Are they the same product or not? 
If so, who’s right? 

Thank you very much in advance.

[ONIKKINEN]

The distance is not that strict in mine. I have tried 54, 55 and 56mm with my maxfield and saw no obvious difference in any of them. So with my 8'' F4.4 scope it didn't really matter that much whether it is accurate to some or the other claim.

Your mileage may vary of course, but that's how it was for mine.

[barbulo]

Ok. Then it seems it is very indulgent. 
I am going to try tonight (weather permitting) with 57,3mm, given that I’ve removed the stopping ring and the filters are 2mm thick. 

[Clarkey]

Just try it. It will depend on how fussy you are, sensor size and any minor tilt in the image train. Even where a specific distance is quoted I have always found it an approximation.