Update
In January 2018 I wrote a post about becoming a Brand Ambassador for Formatt-Hitech filters - I Am a Formatt-Hitech Ambassador! I resigned as a Brand Ambassador in July 2018.
Some background
In July 2017 I contacted Formatt-Hitech to see about getting a filter kit to review on this blog and my YouTube channel. They weren't able to provide me with a kit but did offer to have me as a Brand Ambassador which entitled me to a discount and allowed me to offer discounts to my followers. I purchased my filter set in July 2017 and used the filters, sparingly, over the past year. I am going to write a brief review in the second half of this post. The kit I bought came with .3 to .9 (1 to 3 stop) solid and graduated neutral density filters. I also bought 1.2 (4 stop) solid and graduated filters. The filter holder is aluminum and I bought 2 rings - 67mm and 58mm. The filters I bought are
resin filters and not glass, the glass filters are considerably more expensive.
As I mentioned, I didn't use them a lot but was happy with most of my results but when I tried to use the 3-stop solid filter I realized I had a second 2-stop filter. This was the case for both solid and graduated. I wrote to the company and the filters were immediately replaced with the proper 3-stop. Their customer service is quite good and they were very responsive - I don't know if this is because I was an Ambassador but I don't think so. Everyone that I have dealt with at the company has been very helpful and friendly.
The Review
How I Tested
So, I know all about scientific methodology and controls but I don't have that kind of time. I wanted to put the filters thru their paces in somewhat "real world" conditions, with my main concern being "color cast". Neutral Density filters should be just that - neutral. I wasn't overly concerned with how accurate the "density" was - I wasn't measuring to see if the 1-stop was, indeed, a full stop.
I wanted to keep the number of variables to a minimum so I picked a cloudless, windless day and shot under full sun at noon. I taped a white card with the density of the filter onto a piece of white foamcore. The camera was mounted on a tripod and all exposures were at f/16, ISO 100 and "auto" white balance. The only thing that changed from exposure to exposure was the shutter speed. The camera was a Canon EOS Rebel T3i with a Canon EF-S 18-135mm lens @ 95mm. I set to "manual focus" and turned off image stabilization - the image quality was "RAW+L" - I wanted to shoot both RAW and JPEG. The images shown here are the JPEG images and are all "out of the camera" with no post-processing whatsoever.
The Test
The idea was to test each filter separately (solid and graduated) and then "stack" them to achieve greater densities. The filter holder has three (3) slots, so that was the maximum number of filters for any given exposure.
I started with the 1.2 and worked down to the .3, each a single shot with a single filter. Next, leaving the .3 in the holder, I paired it with each of the other filters - .6, .9 & 1.2. The next step was to test combinations with the .6 and I tested it with the .9 & 1.2, finishing up the initial round of tests with the .9 & 1.2.
After running through all of the combinations with the solid filters, it was time to try the soft graduated - I did each separately and then paired them with the corresponding solid filter, ie .9 soft grad with .9 solid. I didn't bother to run thru
all of the combinations.
The last test I did involved only the .9 filter - I wanted to see if there was a "right way" to put it in the filter. I put it in with the engraving facing the lens and then facing away from the lens - there was no difference in the resulting image.
The Results
The results were a mixed bag - some of the filters were truly "neutral" while others were not. The .9 (3-stop) solid filter was the least neutral of them all, in fact, it really wasn't "neutral" at all - there was a distinct magenta cast to the image. This was more pronounced when stacking filters with the .9. This was true of the .9 soft grad, too.
The Bottom Line
If you are looking to open up your lens by 1 or 2 stops to get shallower depth of field, you can get by with these filters. The same can be said if you need to tame a sunset (sunrise) sky a bit - 1 or 2 stop soft grad should do well for you. If, however, you want to be able to use the filters for long exposures or need to open up the lens by more than a couple stops - my recommendation is that you look elsewhere.
Epilogue
I contacted Formatt-Hitech about my findings and gave them access to the JPEGs - this is when I was told the
resin filters are not suited for stacking or exposures greater than one or two seconds. I have done some longer exposures in the past - 15 to 20 seconds - in lower light situations and didn't notice a strong color shift when using a single filter but did notice some when stacking. The factory did offer to put my filters thru tests to determine if they were faulty but the packaging and shipping was to be at my expense. The factory is located in Wales. It seemed a fool's folly after learning about the limitations of the filters; from what I had learned thru our emails, even a 100% flawless filter in this series was not going to produce the desired results.
The company does produce a line of glass filters called "Firecrest" - they are quite expensive. I don't know anything about this line, other than what is written on their website but would suggest you look into this line if you are interested in Formatt-Hitech and long exposure photography.
As I mentioned earlier, this was an informal test to see how the filters perform in real life. Your results may be radically different than mine and I cannot vouch for how the filters perform under different lighting conditions. I also based my opinions on the "out of the camera" JPEG images. I decided to bring some of the images into Photoshop and use "Auto Tone" to see how the images would look - most of them were acceptable after applying "Auto Tone" but any combination of filters that included the .9 soft grad still had a distinct color cast on the area covered by the graduated ND. I took five of the test images, brought them into Photoshop, made a duplicate layer, applied "Auto Tone" to one layer and left the other "as-is". Using a layer mask, I created a side-by-side composite - the left side of the image is the edited side while the right is "out of camera". You decide which is more suited for you. I tried using "Auto Tone" on the RAW file using Adobe Camera RAW - the results were not as pleasing and would have required much more work to get a pleasing effect.
When I finished writing this review, I sent a copy to the company asking them for input. I wanted to make certain that I properly represented what they had told me. I have included their feedback below.
from Formatt-Hitech
The following is an excerpt from an email I received after sending them my review:
I have attached a screenshot from our website below, you can reach this page yourself using the following link: https://www.formatt-hitechusa.com/neutral-density
This section of the Learn area of our website deals specifically with ND’s and their relative uses.
Under Popular Uses we state that;
4-6 stop ND filters create a moderate lengthening of exposure time to create a misty effect in moving water. Usually around 1 second.
(Unless I have missed it, you have not included in your blog or any earlier emails how long an exposure you were attempting, but as I said in my earlier email, anything up to 2 seconds should be ok, anything over that will give a colour cast). (Authors note – as stated above, the exposure ranged from ¼ to 1/500 sec, well within the 2 seconds mentioned here.)
The second thing to notice from this section is, under Choosing a ND;
Standard ND are professional quality resin ND filters available between 1-4 stops of ND. Standard NDs don’t block infrared, but they only go up to 4 stops of density, so infrared is not an issue because there is not enough filter factor to overwhelm the digital sensor. With standard NDs, you get a professional quality ND at a really low price.
So we do make it quite clear that the resin filters do not block infrared. This would make them unsuitable for long exposure work. (Authors note – while it does, indeed, state that it doesn’t block “infrared”, I had no idea up until now what that meant. I also don’t know the relationship between that and exposure length. It does state that a 4-6 stop ND will give you an exposure “usually around 1 second.” But doesn’t warn against longer exposures.)
With that being the case, as the results of your blog are that you are experiencing a “distinct colour cast”, I would appreciate if you could refer to this section of our website (maybe include the link) and advise what length exposures you were trying. With anything over 1 second being beyond the bounds of the recommended use. (Authors note – as stated above, the exposure ranged from ¼ to 1/500 sec, well within the 1 second mentioned in this paragraph.)
UPDATE - 3 August 2018
Formatt-Hitech offered to test the .9 ND filters - both solid and graduated - to see if they may be defective. I was going to send them back but there was some initial confusion and then I decided to sell the set so I decided not to return them for testing. If you are interested in purchasing the filters, leave a message in the comments below with contact information or send me an email at valencia32photo@gmail.com and use the subject line "Formatt-Hitech filters". I can also give you the contact information for the people I was dealing with and you may be able to get the filters tested and replaced, if faulty.
See for yourself
If you are interested in seeing ALL of the images, you may check them out at this location - https://drive.google.com/file/d/1jI4YgWncegz-JQ9sW_lbLtxV4fdNOdDR/view?usp=sharing. I don't know how long I will make them available - if this link doesn't work, let me know and I can reactivate it. I can also make the RAW files accessible, upon request.
