ASI034MC/ASI290MM Parfocal?

mktmgrjrm

I'm considering adding the ADC to my imaging train which includes the EFW and the ASI290MM-Cool camera. I do not have a color camera to set the ADC, so thought I might be able to use an ASI034MC to help with that task. In order for this to work, the ASI034MC and the ASI290MM-Cool would need to both have the same distance to the focal plane, right? Assuming that this is the case, are these two cameras parfocal?

Thanks!

Sam@ZWO

not exactly, you may still need to adjust little

mktmgrjrm

Sam:

Thanks for the response. I decided to buy the ASI120MC rather than the ASI034MC, as I am also going to use it as a guide camera. Is the ASI120MC closer to being parfocal with the ASI290MM than the ASI034MC, or will adjustment still be necessary?

Sam@ZWO

I think still necessary

because sensor's thickness is difference