Originally posted by SweFin THank you all for your inputs. The hat seems to lean towards the 15/4 much due to what seems extraordinary flare resistance.
Paul: I was a bit unclear there, appologies. I find it suprisingly good at walkarounds in the city, museums and just amazing at closeups att all ranges, but my attempts with shots near infinity has not rendered as good as it does at other distances.
---------- Post added 07-15-14 at 09:18 AM ----------
This i must learn more about i see. But now when i think about it, was the some issue using filters on the 15/4? I realy want to be able to use ND filter. Or perhaps i just remember it wrong.
Ventzy: Some nice shots there!
Not so much any issue with using round filters on the DA15 except note that some of the "slim design" meant for wide angle lenses can foul with the sliding hood scraping the felt lining.
If I remember correctly I think it is the B+W slim filter in particular and a couple of other brands too. (it would also scrape on the sliding hood of the DA35macro and FA77).
The normal design of the 49mm filters are OK and do not appreciably cause more vignetting in the corners of the frame than there already is at f4.
see pic attached to see how the frame of the filter (a normal thickness polariser) fits with the lens with the hood extended. The filter is only just into the corner of the hood profile. The other filter pictured is an ND400x which is a bit thinner frame.
As mentioned by others, the square filters are a little extra challenge due to the hood design.
For landscapes both work great and especially the DA15 with "classic" (cliche?) wide angle composition with foreground subject and background both in focus - hey it works.
For people shots I think the DA21 works better. I use the DA15 a lot and take it always. The DA21 reasonably often but admittedly this is mainly when I'm not wanting to carry around a 18-135.