14mm pancake and MASSIVE purple fringing

mh2000 wrote:

Paulmorgan wrote:

mh2000 wrote:

Anders W wrote:

mh2000 wrote:

Paulmorgan wrote:

mh2000 wrote:

maljo@inreach.com wrote:

For other applications, it's ok.

not really. I just upgraded my LR and people say that it fixes it... so will give that a chance before dumping the otherwise promising little lens... and LIKE little!

I`m using LR 5.3 and I can`t see any difference, but I don`t get a lot of CA with my 14mm.

Darnit! When I first posted a similar gripe about this lens, everyone here jumped all over me saying my problem was all my fault because I hadn't upgraded my computer/OS so I could upgrade LR. Figured it was probably fanboys, but couldn't call it until I got the newest LR up and running. Haven't gotten my catalog and stuff up on the new computer yet... fingers crossed.

Thanks!

You and Paul are probably talking past each other. The upgrade from LR 4.x to 5.x doesn't change anything with regard to CA correction. The upgrade from LR 3.x to anything later (which is what I think you Mark are talking about) certainly does.

With LR 4.x or later you get the option to correct lateral CA automatically by means of a checkbox labeled "Remove Chromatic Aberration". This type of correction has always been done in body if you use a Pany lens with a Pany body but not for any other body-lens combination (except with the E-M1 which does it for any electrically connected lens). With LR 4.x or later, you can have it done for any body-lens combo, including lenses that are not electically connected to the body. The correction is done automatically and is virtually free of any downsides. You can have that box checked in your import preset (as I do) and you won't even have to remember to check the box for each image.

On top of that, from LR 4.1 on there is also a defringe tool for dealing with any type of CA that the checkbox correction for lateral CA can't cope with. This tool requires a bit of manual work and is not free from downsides. It works by desaturating the offending hues, which means a) that you'll get gray rather than the color that should have been there in the first place when you remove the fringe and b) that you have to watch out so that it doesn't touch colors elsewhere in the frame that are in fact not CA and should be left intact.

The latter problem is more common than I first thought and I now watch for it carefully, which is a bit tedious and time-consuming since there is no sure way of knowing where in the frame it might happen. Sometimes, I see it only later and have to go back and deal with it. In spite of this, I certainly appreciate having that defringe tool available. Earlier, I had to visit Photoshop to do this kind of desaturation and that was even more tedious (less efficient tools plus the need to PP in two stages).

The purple fringing you get with the 14/2.5 on an Oly body, and which sigala1 shows in his OP is a bit special in that it is neither longitudinal CA nor lateral CA of the ordinary kind. It is due to the fact that the lens is designed for Panasonic bodies with stronger on-sensor UV filtering than that used by Oly. As a result, you get a form of residual lateral CA that the LR checkbox correction can't cope with. In order to get rid of it, you have to use either the defringe tool or a 2A UV filter, the effect of which is to bring UV filtering up to the strength the lens is designed for.

The latter solution is better since a) it doesn't result in desaturation artifacts (graying) where the fringe is, b) doesn't cause any problems with unwanted desaturation elsewhere in the frame, and c) gives you one thing less to deal with in PP. But then filters cost a little bit and can sometimes have downsides of their own (flare, loss of light). Yet, based on my own experiences as well as those I hear from others here, these downsides are hardly of the serious kind in this case.

Thanks! Well, I'll see. Hate upgrading computers, so will probably a week or so before everything is restored and setup.

So you had to get or build a new computer then, I hate it when you are forced to upgrade.

Yeah, stupid LR needed something newer than (stable) XP. Have to figure out how to get my Monaco calibration puck to work with it though...

I was out of luck and had to upgrade that as well