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Test of K&F Concept Filter Holder & squared Filter

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    Posted: 19 October 2019 at 20:10
Hi everyone,

I would like to share here with you my thoughts on a filter solution I adopted recently.

So I am a circular filters user, nothing special here with that. My main concern comes from the fact that I own various lenses with different thread filter sizes from 55mm to 77mm. Obliging me to buy filters for each of those sizes if I really felt the need.

Moreover 2 months ago I got a new ultra wide angle lens, the tamron 15-30/2.8 and this lens can't have any circular filter on it due to its huge bulbous front element.
So I had a look at the different solutions for this very lens. Seeing the prices of the filter holder system for this lens and the prices of the 150mm filters themselves, I ended-up wondering myself:

1) If I really want to go this route ?

2) Why not to try something cheaper on my other lenses with a 100mm filter system and see how it goes with my workflow ?

So I had a look here and there on the web and found that K&F concept were proposing a 40 in 1 solution: The filter holder with multiple adapting rings and 40 filters colored, ND and GND for less than 50 bucks... I was a bit surprised so I had a closer look and understood that the filters were made out of plastic, which is not I want ==> https://www.kentfaith.com/filter-sets/AMSKU0487_40-in-1-graduated-nd-filter-set

In the end I also found that they propose GND filters and ND filters in 100mm.

So I decided to give a try to their filter holder with the soft GND 3 stops filter.

First off the filter itself is coming in a pouch of pretty good quality, sort of leather and inside the textile is protecting the filter from scratches. I admit I was gladly surprised by this. It also has a magnet to keep the pouch closed, pretty neat.

Concerning the filter itself. I see it as a good piece of glass indeed.

The filter holder is the element that I had the least expectation due to its price (around 20 bucks) but it is made out of metal composites, so I didn't expect that at all. The adapter rings are also made out of metal. So there is very little chance that anything could break easily. None of the part is flimsy so yes that's a definite positive here.

Now concerning the installation of the filter:
Pretty classic you screw the adapter ring onto your thread being the lens or your CPL and good to go. I did put it on my CPL no problem with that.
You slide your filter in one of the brackets. The filter holder is able to support up to 2 filters at once.

Obviously when we are on the market for filters, we always want the best for our lenses, which is normal. Well I made a couple of tests shots, at sunset, sunrise, during the day and even timelapses. I didn't find that it impacted the sharpness of my images, nor introducing color shift of any kind.

To conclude, I want to say that if I hadn't bought the tamron 15-30/2.8, I don't think that I would even have educated myself concerning squared filters. Fact is now I really see the investment into this kind of filters. I mean I see myself taking a 100mm ND64 and/or ND1000 now and I know that I will invest into something for the tamron too in the 150mm ( my eyes are towards the Haida system for this one).
I find it more useful and in the time easier to consolidate with whatever lens I could buy without having to care about its size for filter thread.

Hope you liked this review of the KnF Concept filter holder and their soft GND8 100mm filter and if you feel tempted don't hesitate to have a look at the links below to have some discounts.

Filter holder:
On KnF Concept web site: K&F Concept Filter Holder With Adapter rings
On Amazon: K&F Concept Filter Holder With Adapter rings / 10% off Coupon Code: RV29IQ65

Filter soft GND8:
On KnF Concept web site: K&F Concept Soft GND8 100mm squared filter
On Amazon: K&F Concept Soft GND8 100mm squared filter / 15% off Coupon Code: XOJVNGHY

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