Can I check image flatness with Flat frame?

[RayD]

I now have my new TS 80mm refractor and field flattener.  I have pretty much sorted out the spacing to within 0.5mm and would like to check it, but like many at the moment "I ain't got no stars" as they say in Bermondsey.

Question is do I need a star field image to check the flatness with CCD inspector, or can this be done with a flat panel image?

[Davey-T]

No idea Ray but forecast says clear tonight, mind you it says clear now and it [ain't] 

Dave

[RayD]

3 minutes ago, Davey-T said:

No idea Ray but forecast says clear tonight, mind you it says clear now and it [ain't] 

Dave

Oooh does it?  Ok cheers Dave I'll keep an eye out as I'd rather do a real world test 

[Xplode]

No a flat frame won't help you, flat frames are for fixing vignetting/dustmotes and have no stars so there's star diameters to measure to see if you got a flat or curved field.

[RayD]

3 minutes ago, Xplode said:

No a flat frame won't help you, flat frames are for fixing vignetting/dustmotes and have no stars so there's star diameters to measure to see if you got a flat or curved field.

Perfect thanks 

[RayD]

On second thoughts Dave I've just checked the temperature and it's -2 feels like -6 here at the moment!  Maybe I'll just look at the vignetting 

[Davey-T]

49 minutes ago, RayD said:

On second thoughts Dave I've just checked the temperature and it's -2 feels like -6 here at the moment!  Maybe I'll just look at the vignetting 

C'mon Ray man up, i've been out and set up ready 

Dave

[RayD]

1 hour ago, Davey-T said:

C'mon Ray man up, i've been out and set up ready 

Dave

Oh.....erm....well..... it's me gout ya see, the cold plays havoc with it 

[Davey-T]

7 minutes ago, RayD said:

Oh.....erm....well..... it's me gout ya see, the cold plays havoc with it 

Better lay of the Port and red wine then 

Dave

[RayD]

19 minutes ago, Davey-T said:

Better lay of the Port and red wine then 

Dave

And cheese