TAK TSA102s Yellow Green Fringe around Moon
Posted 14 July 2013 - 12:08 PM
One thing, if I moved my eye around the eyepiece, it disappeared. I've used this ep with my SCTs and did not see this. I also tried a 31mm Plossl and also saw the yellow-green fringe.
Is this common for this scope or do I have an issue that I need to take up with TNR.
Posted 14 July 2013 - 12:16 PM
Posted 14 July 2013 - 12:41 PM
Posted 14 July 2013 - 03:00 PM
I have never seen that in my TSA 102. I could check my notes but I think I would remember seeing color while in focus on any object. I've noticed that some eyepieces - even quality eyepieces - may produce a bit of color fringe on the Moon when you move the Moon's edge near the edge of the field of view. Perhaps that's what was happening?
Does this happen at the center of the field of view?
Posted 14 July 2013 - 03:11 PM
I will try again tonite, 1st making sure everything is in thermal equilibrium, and the if I see anything, I'll move the image within the FOV to see if anything changes. The only curious thing was that the colors disappeared when I adjusted the angle of my eye to the eyepiece.
Guess should also try looking with the other eye to rule out my right eye from being an issue.
Posted 14 July 2013 - 03:52 PM
Posted 14 July 2013 - 03:56 PM
Posted 14 July 2013 - 04:12 PM
Posted 14 July 2013 - 04:47 PM
In my TAK FS 128, I notice the following:
I see such a fringe with my 13 mm nagler type 6, less so in my two Panoptic eyepieces, not there in my Tak LE's. So, maybe it's a function of design/no. of elements in an eyepice.
In all the ones it does show up in, I don't find it objectionable; just noticable. I have yet to try out my new Delos 4.5 mm on the Moon. Will report when I do. I've had this scope for 10 yrs. now and still marvel at the quality of images.
Posted 15 July 2013 - 10:47 AM
this seems to be an eyepiece problem otherwise the fringe would not disappear if you look from another angle into the eyepiece.
Posted 15 July 2013 - 12:53 PM
Did you perform a star test? When performing a star test you need good seeing. And give the scope enough time to cool down.
As Art suggested, you can also call TNR. I'm sure they can help you out.
Posted 15 July 2013 - 01:55 PM
Try something like an UO HD ortho and you'll get the best view of the moon, less scatter, no lateral color, and more contrast than an 8-lens wide field in my experience. My XW's add a tiny bit of color error on bright objects as well.
Posted 15 July 2013 - 02:21 PM
Posted 15 July 2013 - 03:11 PM
Posted 15 July 2013 - 03:43 PM
I hereby register my *extreme* exception against the notion that a lack of thermal equilibrium will introduce any perceptible amount of longitudinal chromatic aberration in the objective! Other aberrations will rear their heads *long* before color error.
Posted 15 July 2013 - 03:47 PM
Posted 15 July 2013 - 03:53 PM
Posted 15 July 2013 - 03:59 PM
Posted 15 July 2013 - 04:08 PM
Posted 16 July 2013 - 12:58 AM
Posted 16 July 2013 - 09:31 AM
Glenn - I agree with you...I don't see how thermal equillibrium could induce lateral color. Like atmospheric seeing, I can see how it might induce axial chromatic aberration, but not just lateral chromatic aberration.
Posted 16 July 2013 - 03:22 PM
my TSA 102. My Vixen LV eyepieces showed a colour fringe.
Posted 21 July 2013 - 10:52 AM