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Filter sizes?

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Bob T View Drop Down
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Post Options Post Options   Quote Bob T Quote  Post ReplyReply Direct Link To This Post Topic: Filter sizes?
    Posted: 20 November 2019 at 21:34
I'm using a Sigma 24 - 105 f4 Art lens with 82mm filter ring, on A99. Currently I'm using 80mm slot in filters (Cokin type). I find that with the focal length wider than about 45 - 50 mm, I get vignetting. If I move up to 100mm filter system, will I still get vignetting? Any suggestions for a brand of filter to change to? Kase are getting good reviews for being hard to break, hard to scratch and very easy to keep dry in wet weather

Edited by Bob T - 20 November 2019 at 21:38
 



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waldo_posth View Drop Down
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Post Options Post Options   Quote waldo_posth Quote  Post ReplyReply Direct Link To This Post Posted: 20 November 2019 at 22:20
Although the Cokin P system maxes out at 82mm it is not recommendable to use with that combo (I have the same). The only improvement here is to use the Cokin P wide angle lens filter holder - since it is the filter holder which creates most of the vignetting.

The Cokin Z system (for 100mm square filters) works without problems - that's what I use, but I have modified the original holder by using longer screws and butterfly nuts (you want to have a tight filter packet when creating long exposures - seals for the ND filters are also important in that case). The Lee system's holder is a bit different. For both, Cokin and Lee, there are cheap Chinese copies which work well (enough).

I use 100x100mm Haida ND filters (6 stop, 10 stop, 15 stop). The stacking of filters is another cause for vignetting. Usually I do not use more than two filters in the holder (mostly a ND and a GND filter). I have reduced the size of the holder to two slots.

See here for some long exposures created with that lens (different camera, though) and the Cokin Z system.
"Stare, pry, listen, eavesdrop. Die knowing something. You are not here long." (Walker Evans)   http://www.flickr.com/photos/waldo_posth/
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whiteheat View Drop Down
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Post Options Post Options   Quote whiteheat Quote  Post ReplyReply Direct Link To This Post Posted: 20 November 2019 at 23:24
Any 100mmx100mm would do just fine in that you won't get any vignetting. However, I suggest reasonable quality glass filters as opposed to cheaper resin/plastic filters, is the way to go.
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Macca View Drop Down
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Post Options Post Options   Quote Macca Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2019 at 12:37
If you go 100mm you can build yuor kit up gradually through sales and warehouse deals at amazon and such like.I got most of my 100mm filters half price or less and they`re all good makes, Nisi, Rollei, Haida, the new ones from K and F concept are good quality too and can be had direct from China via the likes of Ali Express, a little cheaper than ebay.All glass, all good image quality.

Try the Sioti holder on amazon its about £25,it`s aluminium and not plastic and and has a variety of filter ring holders up to 82mm with no vignetting (wide angle versions), you get your preferred one free with it but need to pay for other filter ring sizes, a few pounds. Its on a par with the lee filter holder but much cheaper.As Harald says sometimes replacing the screws of the filter clips improves grip.

I`ve ordered the new magnetic strips and magnetic filter holders from H and Y filters to replace the filter clips on mine and all being well will do a short write up on them, from what i`ve seen round the net so far they look a quick and easy solution to changing filters in the field and not running the risk of filter clips getting loose over time. they are having sale just now on bundles of magnetic filter holders and the magnetic clips for your system.

Think long term and do it gradually rather than buy cheap and pay twice.

Edited by Macca - 22 November 2019 at 12:51
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Macca View Drop Down
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Post Options Post Options   Quote Macca Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2019 at 12:47
On a side note I acquired the Zeiss 15mm 2.8 whilst on hopliday in the US via a great deal at KEH 2nd hand ($800). It has a 95mm screw filter thread and mine has had the built in hood factory removed.I would very much like to use my 100mm system on it without vignetting and am exploring options just now.i don`t ant to run 2 filer systems if i can help it.

The irix filter holder for it`s own 95mm filtered lenses doesnt` get good press and others like Bombo similar but I`ve noted a few solutions for wide angle zooms for 100mm and have sent some emails and see what they reply.

There are 95mm filter ring holders for the likes of Lee 100mm systems but I strongly suspect they vignette and haven`t purchased any yet. If I can rig up the H and y magnetic ones to something or one of their holders I`ll write that up too as it`s a more common problem now with newer UWA lenses.
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Bob T View Drop Down
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Post Options Post Options   Quote Bob T Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2019 at 20:13
Thanks for all the replies folks. It appears that I'll be ok with the 100mm system. I'm currently using the entry level Formatt Hitech filters in Cokin style Chinese holders and like a lot of other people, I've bought cheap and paid twice. Going by the online reviews, I'm leaning towards Kase. They are glass and appear to be hard wearing and more scratch resistant than other brands. They don't appear to have the same problems with colour cast.
 



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