Why do I get dark corners with my filter (vignetting)?
The GT lens has a front thread of 49 mm, but since it’s a very wide zoom, it’s very sensitive to additional filters that are put in front of the lens. The filter can cause darkening of the corners (vignetting) where the camera ‘sees’ the filter. Some users report no vignetting even with 49mm filters at 4mm thickness + thread, eg Hoya 49mm HMC UV(0) filter. Others need to use a slim filter that is 3mm thick, eg Hoya 49mm Super HMC Pro1 UV(0), or use a 49-62mm step-up ring and mount a 62 mm filter (see step-up ring FAQ). Bear in mind that if you stack filters, (i.e. use more than one at once), you are more likely to see vignetting in your images. This is especially true if you stack the circular screw-in type, or use the square system on top of a circular UV. For example, with the square Cokin P series, you will see vignetting below about 35mm (film SLR equivalent) if you use the Cokin polariser and holder on top of a screw-in UV. Bear in mind also that different users see varying amount
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