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Alternative Imaging Methods
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Old June 23rd, 2008, 04:37 AM   #31
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Join Date: Nov 2006
Location: Hannover, Germany
Posts: 400
Hi Guys,
well I had a couple of hours spare this morning and re built the unit and set detail back to normal. There was a noticeable difference in the right direction unsurprisingly but chromatic aberation became more noticeable.

Lighting conditions were not perfect at the time of the test, but good enough to shoot in. There could have been a couple of other factors to explain the aberation now I think about it but I'm in too much of a hurry to investigate further.

Having improved the focus a little we are going to take it out and shoot some stuff with it on Thursday.

I'll post some results when we get back.

(still no contact from Letus. pretty poor customer service in my book!)
Stuart Campbell is offline   Reply With Quote
Old June 23rd, 2008, 07:04 AM   #32
Join Date: May 2005
Location: Allen, Texas U.S.A
Posts: 1,114

take note that CA in this setup can be caused by two things.

1. your stock fujinon when its aperture at f2 and wider. you can isolate this by going for at least f2.8 or lower. Also the CA exhibited by the fujinon has the tell tale color of green and magenta.

2. the achromat. in my observation of the brevis and sgpro, this is tinted towards the blue and yellow colors. Not so sure about the CA from a letus achromat.

also , better edge to edge sharpness is achievable when your, at least, at f8 on the fujinon.
Ted Ramasola is offline   Reply

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