I would like to share with all of you here on the so called Cokin Wide Angle P-Holder which is not so wide after all cos it has hard vignette on my Tokina 12-24mm f4.0 at 14mm and below. There are 2 flaws in its design, one, the thickness of the holder and the unnecessary space between the holder and the Cokin filter and two, smaller than 77mm hole infront.
A simple mod with just a simple tool will correct the flaws in its design. A sand paper and patience are all you need to mod the original NOT SO Wide Angle P-Holder to REALLY Wide Angle P-Holder.
Mount Type 1
The main cause for the vignette is due to the smaller than 77mm hole infront. I have used a sand paper to make a bigger hole. After sanding, the label Dia 77-France on the Cokin ring can be seen after mounting. The P-Holder is mounted on the lens the usual way without any 77mm filter infront. And the result is that I can now shoot at 12mm on my Tokina without any vignette. I am not sure whether this will work for Sigma user at 10mm, but if it doesn’t, can always try Mount Type 2
Mount Type 2
This is my favorite cos it is the most convenience of all. The hole had been sand to the exact diameter to fit into my Hoya HMC filter. I can just snap it on to my Hoya without the hassle of removing the Hoya filter and screw in the Cokin ring. As you can see from the pic below, the edge of the filter ring is flushed with the Cokin Holder. If there is any vignette, it can only be caused by the filter. It can also be mounted on a CPL the same way as well if you need the polarising effect with the Cokin filter.
Mount Type 3
If you think Mount Type 2 is insecured or you have accidentally sand the hole bigger than the exact diameter, you can place the Cokin ring infront of the P-Holder which acts like a screw with washer. The only problem is that it might take a while to screw in the Cokin ring with the P-Holder into the 77mm filter.
Mount Type 4
If sanding a round hole isn’t your cup of tea, you can always to do a reverse mount of the P-Holder to get the same vignetteless pic at 12mm. But you still have to sand down protruding Cokin label at the back, in order for the Cokin filter to slide all the way down.
Happy Shooting after Sanding!
A simple mod with just a simple tool will correct the flaws in its design. A sand paper and patience are all you need to mod the original NOT SO Wide Angle P-Holder to REALLY Wide Angle P-Holder.
Mount Type 1
The main cause for the vignette is due to the smaller than 77mm hole infront. I have used a sand paper to make a bigger hole. After sanding, the label Dia 77-France on the Cokin ring can be seen after mounting. The P-Holder is mounted on the lens the usual way without any 77mm filter infront. And the result is that I can now shoot at 12mm on my Tokina without any vignette. I am not sure whether this will work for Sigma user at 10mm, but if it doesn’t, can always try Mount Type 2
Mount Type 2
This is my favorite cos it is the most convenience of all. The hole had been sand to the exact diameter to fit into my Hoya HMC filter. I can just snap it on to my Hoya without the hassle of removing the Hoya filter and screw in the Cokin ring. As you can see from the pic below, the edge of the filter ring is flushed with the Cokin Holder. If there is any vignette, it can only be caused by the filter. It can also be mounted on a CPL the same way as well if you need the polarising effect with the Cokin filter.
Mount Type 3
If you think Mount Type 2 is insecured or you have accidentally sand the hole bigger than the exact diameter, you can place the Cokin ring infront of the P-Holder which acts like a screw with washer. The only problem is that it might take a while to screw in the Cokin ring with the P-Holder into the 77mm filter.
Mount Type 4
If sanding a round hole isn’t your cup of tea, you can always to do a reverse mount of the P-Holder to get the same vignetteless pic at 12mm. But you still have to sand down protruding Cokin label at the back, in order for the Cokin filter to slide all the way down.
Happy Shooting after Sanding!