The HiTech 100 Pro Stop 10 Filter is not strictly billed as a neutral density filter as it gives pictures a slight blue cast, whereas ND filters should give perfectly natural colours. The filter is a slot-in type rather than a screw-on and this makes it a bit easier to use when shooting – although it’s too dark to compose or focus with the filter in situ, the slot-in style is quicker to change in and out than a screw-on type and with the foam gasket attached it’s just as light-tight. Made from CR39 dyed substrate resin rather than glass, it’s also less prone to shattering if knocked, but you should still be careful as it will scratch just like glass which will cause flare and spoil your pictures.
After some initial light-leaking problems, which we fixed by adjusting the spacers in the filter holder, we found the Pro Stop 10 performed very well and consistently gave us shutter speeds 10–11 stops slower than normal. There was no discernible softening from shooting through the filter and our images came out sharp and clear, while the inherent blue cast was easily fixed during a RAW conversion. Available in two sizes – 100mm or 85mm – priced at £75 or £50 respectively, you can also choose 5 different densities from 6 stops to 10 stops. The filter comes without the modular holder, but this can be purchased separately for £50 or alternatively you can use any 100mm or 85mm square filter holder.
- Filter price (without holder): £89 (As of June 2016)
- Light stopping power: 10 stops
- Visit: www.formatt-hitech.com
This review was first published in the August 2012 issue of Digital Photo - download back issues here.