Help me interpret these curves please

[UlteriorModem]

Played around a little last night with spacing for the RSS-I focal reducer.

I present two curves with descriptions below.

99 mm curve by Tom Whit, on Flickr

This was with a spacing of around 99mm to the focal plane.

96 mm curve by Tom Whit, on Flickr

This was with a spacing of around 96mm

If I am guessing correctly that the 96mm may have moved in a tiny bit to far given the 'hump' in the center?

Which seems kind of odd as Baader states an 'ideal' distance of 94.5 ?

[UlteriorModem]

Okay well never mind. It turns out the second one was an anomaly. Evidently you should not use single frames in ccd inspector

[UlteriorModem]

Okay here is a curve from last night I had ground off 2mm of adaptor length to achieve the prescribed back focus of 94.5. Some improvement but damn!

94.5 mm curve by Tom Whit, on Flickr

There is some improvement but geeze what a curve.

[SkyHiker]

Thanks for sharing that Tom. I hope you can find the right distance, But jeez that's a lot of work to get it right!

When my MIA Newt arrives I was hoping I could just zoom in with my DSLR, try a few rings for the Paracorr and go. This is scary.

[UlteriorModem]

Ive been talking with Kathy. Evidently the paracorr works quite well with a DSLR.

The ccd camera requires a few hoops to jump through.

Frankly I am about to put the astrograph back in it's bag and move on.