richandtd Loc: Virginia

Been thinking of getting Firecrest Ultra ND filters for time exposure and their available as both a screw in 77mm and a system with 100mm slide in filters in to a holder. What is the advantage of of either? Looking at 6, 10, and 16 stops. The camera I use is a D810 with 17 - 35 mm 2.8 and a 70 - 200 mm 2.8 both 77mm filter size.

rgrenaderphoto Loc: Hollywood, CA

I have multiple Lee 100 mm rectangular grad NDs, and a 6x and 10x ND for use in screw on filter holders.
I find greater flexibility with the ND grads to adjust the separation line based on my composition.

For the 6x, 10x and 16x, do yourself a favor and use the Breakthrough Photography X-100 holder and adapter rings. Reasonably priced, excellent performance.

Regardless, download the Lee BigStopper app for exposure timing based on filters used. Has a handy countdown timer for longer exposures.

The att image combined a 6x and an 10 x Lee for a 2½ minute exposure. There was a constant stream of beachgoers passing in front of the lens who never showed up in the final exposure.

(Download)

juan_uy Loc: Uruguay

I am pretty new on photography and even more on filters. So take my reply just as a first comment and let's see what the experts have to say.

For ND, I ended up with screw in one (bought for lens with biggest diameter and use step rings as needed for the rest). I like that they take less space (no need of special adapter/holder) and less risk of vignetting (at least against cheap holders).
Personally I think I would use slide filters only if I wanted graduated ND.

The main advantages of slide ones that I can think are:
- Easier to stack multiple filters, and probably less risk of vignetting when stacking them
- Once the holder is set up on your lens, is faster to remove/re-add the filter or to stack additional ones
- Not sure on this one, but I think there are better quality filters than the screw ones.

Hope more users join to give more useful advice :)

EyeShootWideOpen Loc: Florida

Thanks for sharing this.