With the recent purchase of a 2nd ten stop filter I finally had a chance to compare 2 of the them side by side. My original filter, a Heliopan ND3.0 has been well used and was a very good buy. However, the screw in can be cumbersome especially if you recompose for any reason.
The big problem with a screw in 10 stopper is that with it in place you can’t see anything at all through the viewfinder. This means you need to remove the filter to recompose and attach again for the shot. Either that or guess the composition, ramp up the ISO, take a test shot of a few seconds and adjust till you get the composition and then drop down to a low ISO and take the shot. Neither that handy if I’m honest.
Hence, the attraction of a slot in 10 stopper. In a perfect world I’d have bought a Lee Big Stopper, a proven product. Sadly, the Lee filter is almost impossible to get hold of right now thanks to supply issues at Lee and 2nd hand items are going for nearly double the price on ebay. Facing either nearly £200 for a Lee or a 6 month wait I opted for the new Hitech Pro Stopper.
Hitech claim this filter is made of a new IR resistant resin and they also claim to have fixed the light leak issues of the old filter by adding a 1.5mm gasket (for Lee holders, 3mm for Hitech holders). The filter comes in it’s own pouch and does seem pretty well made. Price is reasonable at £72 from TeamworkPhoto. TeamworkPhoto also supplied by Heliopan at a cost of £92 for the 77mm version.
So, how do they compare side by side?
This was a shot taken one after the other in dull conditions. Both shots were 90s exposures with a Hitech 150 0.9 GND in front of the 10 stopper. Same ISO, same lens, same f setting etc etc. The shot is a straight conversion of the RAW file to jpg for each with no PP applied.
As you can see, the Hitech does have a pronounced blue cast compared to the Heliopan which has a slightly warm cast but much better colour reproduction. Casts are not that hard to remove but obviously there is a lot less work to do with the Heliopan. The blue cast however, might be desirable in seascape type shots.
The Hitech also seems to let in slightly more light that the Heliopan, maybe not quite a full 10 stops? Other than that, all other areas of performance seem fairly equal.
So, it comes down a choice between the convenience of the slot in filter vs the colour reproduction of the screw in filter. Shooting for B&W, the slot in will be fine. Shooting for colour, I’d go with the fiddly screw in every time.
I’m going to keep the Hitech filter though, it’s got a place to be used where the screw in maybe isn’t convenient. The Hitech too unlike the other popular 10 stoppers in the market isn’t glass, it’s resin which should make it far less likely to end up in a million bits on some slippy rocks somewhere!