Re: Cokin vs. Jessops P size filters in the UK

[stevet@xxxxxxxxxxxxxx (Steve Taylor)]

One of the things to note with the Cokin holder is that you should rotate it so that the bits that stick out the furthest are along the top and bottom of your lens.  (the holder is being held horizontally and not vertically.)  Using this method I have been able to take potos with a 17mm lens, one filter and no vignetting.  If the holder is attached vertically the vignetting is obvious with or without the filter present.

Cheers    -Steve

>Hi,
>
>I am in the realm of conjecture but perhaps the following might assist you:
>
>The vignetting is likely to come from the filter mounting holder rather
>than from the filter itself. The "P" series filter ought to be large enough
>to avoid  vignetting with a 52mm filter size lens. .  So, to see if this is
>so  conduct a test with the filter mount in place but the filter off the
>camera. Under reasonably bright light conditions-camera on a tripod for
>ease of handling- adjust your lens until it is focussed on target object
>and with lens at the wide end (28mm) of the zoom point .   Then use your
>depth of preview button to stop the lens down at each aperture. If the
>filter mount is the problem you should pick up the vigneting in the
>viewfinder.  This approach will need some patience and willingness to
>really examine the darkened image in the vewfinder for sufficient time to
>allow your eyes to become accustomed to the dim view-particularly at small
>apertures.
>
>If my suspicions are correct the vignetting will appear at the wide angle 
>end of the scale only. 
>
>What to do about it ? Well, if it is the filter  mount accessory it might
>be possible to trim back its front or leading edge which I recall is
>designed to carry  two-three filters all up. Trim back the two (?) filter
>slots that are really redundant  so that the mount   now only takes the one
>filter dedicated to your (mine too ) passion for IR. Your filter mount will
>now not intrude or extend so far out in front of the lens element and thus
>not be "seen" 
>
>Incidentally, because I am essentially a lazy sod I have sometimes simply
>used the Cokin red filter) P series) with HIE-135 by just holding it in
>place taking care to use just finger tips and with hand behind the front
>element alignment of the lens. It works-but no doubt will upset the
>sensibilities of some friends who read this site.  This  approach might
>allow you to avoid vignetting unless of course you end up with superb IR
>shots of your fingers, instead !
>Regards from the Land of Oz- a country specifically designed for IR
>photography
>
>Des
>----------
>> From: JL <jql7285@xxxxxxxxxxx>
>> To: infrared@xxxxx
>> Subject: Re: Cokin vs. Jessops P size filters in the UK
>> Date: Tuesday, March 31, 1998 7:53
>> 
>> > On 30 Mar 98 at 19:19, Spearmint wrote:
>> > 
>> > > Just a quick FYI for anyone in the UK who uses P series filters . . .
>> > >
>> > > Jessops now do their range of filters in P series sizes at
>considerably
>> > > cheaper prices than you'd pay for their Cokin equivalents.  I just
>> > > purchased a graduated orange sunset filter, similar to Cokin 198 for
>> > > 8.99, compared to Cokin's price of 17.99.
>> 
>> Speaking of Cokin filters, the last time I used them, I was disappointed
>> to find "vignetting" around all the corners of my photos, and have shied
>> away from then since. I have a red filter that I'd like to use for IR,
>> but am afraid of this problem again. Any ideas on how to avoid it? I was
>> using a 52 mm on a 28-70 zoom lens with a Nikon.
>> 
>> Thanks,
>> 
>> jackie
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End of Infrared-Digest V0 #469
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