Analyzing of vignetting of my lenses and telescopes

[Astrofriend (Lars)]

Hi,

I spend a day here to analyze my master flats and what vignetting I have on my lenses and telescopes. It's very simple done but still interesting to set figures on it.

It's done on a full frame camera and I use the values from the center and the corner of the sensor. The corner is 22 mm of from the center on a full frame sensor. I never liked to have strong vignetting in my optics, and in the future I want to go for bigger size than full frame.

I have put together a page over the vignetting I got:

http://www.astrofriend.eu/astronomy/...ignetting.html

Maybe interesting for some of you to have a look at.

My telescope shall handle a medium format sensor of the size 48 x 36 mm with the setup I have now. My medium format optics already do it. Just missing the medium format camera.

/Lars

[Astrofriend (Lars)]

Here are some examples from old astrophotos I have taken with different equipment.

TS130 APO f/7
Pentax 500 mm f/4.5
Pentax 67 f/2.8

Canon 6D
Canon 5D (Mk I)

The object is the open cluster M44, Beehive:
http://www.astrofriend.eu/astronomy/...n-cluster.html

/Lars

[Wavytone]

No surprises there. Camera lenses aren't as good as 'tog's like to think they are... Try the TS130 APO's natively - without the compressors - and they'll look a lot better.

[Astrofriend (Lars)]

There are already TS130 with 1x corrector there. It's not the telescope that is the problem, big city from balcony :-(

/Lars