Advice on Flat Frames please

[pmchugh1961]

I have tried to create a set of Flat Frames using a white pillow-case and a lamp with an energy saver bulb.  The result is a curious shade of green!   I suspect I have been  a numpty, presumably I need either a full spectum light source or sunlight.  

Advice welcome

 

Paul

[JemC]

have a look at this link see if it helps

http://www.budgetastro.net/calibration-frames.html

[pmchugh1961]

This really useful, many thanks.

 

Paul

[happy-kat]

Link here

Interesting diy approach

[goose35]

Mine come out with a blue tint i suspect because i have a baader lp filter with the same tint so bear this in mind.

 

And depends on your white balance setting aswell ie Daylight WB and flourescant or tungsten light will produce a color cast.

Dont think i have ever had fully white flats

[happy-kat]

Does it matter though thought that were about helping effectively with gradients and dust spots so white or blue from a dawn sky doesn't matter. 

[goose35]

2 minutes ago, happy-kat said:

Does it matter though thought that were about helping effectively with gradients and dust spots so white or blue from a dawn sky doesn't matter. 

As long as its flat and even i don't think it does. I think maybe white is used as it allows more light transmission and thus shorter exposures. Doesnt mean the image will allways be pure white though