B&W 110 ND filter.

[Photo550D]

I apologies if this topic has been covered before, I did attempt to search for it but to no avail. (it was more likely human error!)

I am after some advice regarding the B&W ND 110 filter (58mm threaded). Firstly, can anyone offer their feedback / views on this make and if it is a wise investment (i appreciate it is an entry /lower end of the budget filter but this suits my budget for the time being)

I would also be grateful if someone can point me in the right direction with regards to calculating exposure times using such filter.

Finally, are these double threaded ( so that I can add a C/Pol if desired!)

Sorry for all the questions and I appreciate in advance, those that take the effort to assist.

[Alex]

Chris, after buying the square filter system it would be wise to purchase the square 110 and polariser to suit this. Most scenes through the day will still require a ND grad to balance the exposure along side the 110 grad.

[Photo550D]

Unfortunately, I ordered the circular 110 some time ago, wish I had waited. However that said, I really only intend to use the 110 with a CP to create long seascape exposures. In time, no doubt I will feel the frustration somewhere and will likely end up with a square 110 ND for the P series holder. I never realised how much of an investment landscape photography could be :-) that said, I would rather have decent equipment, at least I can't blame my tools for poor quality images!