2
21tones
Guest
I'm using a Cokin P Holder on top of a Canon UV filter on my 18-200 zoom lens.
I'm puzzled why I'm getting vignetting at 18mm when using a Cokin polariser.
I've used the Cokin setup and the same Canon UV filter on my old FD 20-35 zoom in the past and was able to use it down to 24mm before vignetting started. 18mm on the crop format is equivalent to 29mm. It doesn't make sense!
Is it somethng to do with the design of the 18-200?
Of course I could remove the UV filter as it doesn't vignette then, but I'm always concerned about not having some protection on the front of the lens. I sometimes bang the UV filter glass when taking the Cokin adapter on and off if I am rushing to get a shot in changing light. I don't want to be doing that to the front of the lens!
Has anyone tried the slim UV filters like the Hoya Digital Pro 1 on this lens with the same Cokin setup? Does it vignette at 18mm?
What's even more confusing is that I can use a Hoya Circular Polariser on the front of my Sigma 10-20 (with no UV filter on) and then put the Cokin holder on the front of that and not get vignetting until 14mm! The Hoya is the same thickness as the Canon UV.
Do others encounter these problems with the 18-200, or is mine atypical in some way?
With the filter thread on this lens being plastic I wonder how robust it is over time?
I've only just got mine and I put my Cokin filter holder on and off constantly.
Has anyone who has had an 18-200 for a few years found problems with the filter thread e.g. getting worn?
I'm toying with the idea of leaving the Cokin adapter in place all the time and using a Cokin ring cap in lieu of the Canon lens cap.
But then I wonder whether the pressure of putting the filter holder constantly on and off the adapter ring, when its attached to the lens, will cause problems on the lens filter thread.
Any experience or thoughts about this?
Thanks
I'm puzzled why I'm getting vignetting at 18mm when using a Cokin polariser.
I've used the Cokin setup and the same Canon UV filter on my old FD 20-35 zoom in the past and was able to use it down to 24mm before vignetting started. 18mm on the crop format is equivalent to 29mm. It doesn't make sense!
Is it somethng to do with the design of the 18-200?
Of course I could remove the UV filter as it doesn't vignette then, but I'm always concerned about not having some protection on the front of the lens. I sometimes bang the UV filter glass when taking the Cokin adapter on and off if I am rushing to get a shot in changing light. I don't want to be doing that to the front of the lens!
Has anyone tried the slim UV filters like the Hoya Digital Pro 1 on this lens with the same Cokin setup? Does it vignette at 18mm?
What's even more confusing is that I can use a Hoya Circular Polariser on the front of my Sigma 10-20 (with no UV filter on) and then put the Cokin holder on the front of that and not get vignetting until 14mm! The Hoya is the same thickness as the Canon UV.
Do others encounter these problems with the 18-200, or is mine atypical in some way?
With the filter thread on this lens being plastic I wonder how robust it is over time?
I've only just got mine and I put my Cokin filter holder on and off constantly.
Has anyone who has had an 18-200 for a few years found problems with the filter thread e.g. getting worn?
I'm toying with the idea of leaving the Cokin adapter in place all the time and using a Cokin ring cap in lieu of the Canon lens cap.
But then I wonder whether the pressure of putting the filter holder constantly on and off the adapter ring, when its attached to the lens, will cause problems on the lens filter thread.
Any experience or thoughts about this?
Thanks