Adding filter focusing off-sets .... what are the best options???

[MikePaling]

Hi folks .... I hope that have posted this in the correct section.

 

I have been merrily taking LRGB images for a few months now and generally getting used to how things work. I would now very much like to improve my set-up by adding the focusing offsets for my filters .... but I after reading up about this I am getting somewhat confused :-(

 

In addition to my refracting scope my set-up is as follows:

 

(A) Moravian G2 8300 CCD with internal 5 position filter wheel with all slots filled.

The order that my filters are set up (starting from position one) as follows ..... R,G,B,CLS,Ha.

 

( B ) Autoslew, Optec Focus Lynx focuser, MaximDL and Sequence

 

I have already carried out a preliminary V-curve focusing run for the R,G,B,CLS filters to see what focusing differences there are with each filter. I have not tried the Ha filter yet.

I do know that I need to do more runs and take the average value for each filter to work out the best fit offset.

I understand that it is NOT normal to have negative off-sets. At the moment, using my preliminary results, starting with the lowest figure set at zero, the order that my filters come in at is: G, B, R, CLS.

I am not sure if these results are "normal".

 

However, assuming that I do get a full set of offset figure when the skies permit .... I now am trying to understand how to add these filter focusing off-sets into my system.

 

There seems to be 3 options here and I do not know which is the correct one.

 

Option One:

I can see that I can put them straight into my Moravian CCD ... there is a file in the software to allow me to do this.

 

Option Two:

I can see that there is a section in the focusing area of MaximDL where I can type the data in.

 

Option Three:

I can see there is a place in Sequence where I can put the data in .... or does Sequence read this from the CCD anyway ... or even read it from MaximDL ????

 

There is another fly in the ointment for me which adds to my confusion ....

Looking at Sequence .... I can see that my Red filer is set to "Zero" .... and the off-set for this filter looks as if it cannot be changed.

Does this mean that I have to set up some filters with a negative value??? I am not sure if this is possible. How do I get around it if it is not possible?

 

Any help and suggestions to get rid of my "confusion" would be very much appreciated.

 

Regards Mike

Edited November 5, 2017 by MikePaling