Oh... i see, i see... It is unfortunate that the reflection should happen with your main imaging lens.. (i guess i should think about things before jumping on a high horse and shooting my mouth off..)
And yes.. my spelling is average, especially with similar words...... abrasion aberration... Damnit!! you know what I ment
> I don't think it is an internal reflection issue but vignetting. It may be an issue of faster f-ratios with such an interface filter; light farther off
> axis is getting clipped. Experiment by stopping it down to see if it
> dimmishes or goes away with something like f/6.
but really... you dont want to stop down to F/6 if you dont HAVE to... although it would make focusing easier (if you're not auto focusing on a bright star..)
Seriously though I've never really liked the idea of the internal clip filters.
I think on paper they're a good idea if one uses a number of imaging systems with the one camera - saves buying multiple filters or a variety of step rings.
And, in theory they should protect your sensor from gathering dust too!
I've yet to try mine with my 50mm lens. I've concentrated on my L glass as that's my main system. If I can't sell mine I won't be too fussed - it can sit in my kit and wait to be coupled with that ED triplet that's got my name on it
The problems I have encountered are I believe specific to my particular imaging rig - but let's face it there are lots of imagers using similar types of rigs, so it's a wee bit of a disappointing outcome for such high end expensive gear. $350+ for a filter is a hefty price tag innit!!??
Dealer swapped Front Filter for 72mm screw in type - outside imaging with it right now...all subs look free of any vignetting/reflections and I'm pushing 10min exposures too!
Had to purchase a 67-72mm step up ring to get it to fit on my 70-200mm f4L lens ($10 from ebay) and another on the way to try out on my nifty fifty!
One downside - a 72mm filter collects dew quickly!!!
POSTED SOME IMAGES NOW, 72mm Filter First Light!!!
single subs, Cats Paw - 5mins, SMC - 10mins, both iso1600.
200mm f4
Not too bad - longer exp looks like some vignetting creeping in, fixed by flats hopefully - otherwise OK!
Off to bed now - knackered!
Not Quite!!!!!!!!
Returned front filter to Hong Kong dealer, but have to make up the balance of $310HK for the 72mm filter.
Unfortunately, plummeting money markets means that 310 will cost me a bit more than it would have a month ago when this crap started!!!!