about to buy a7s. best ND set (or variable)?

it's all in the subject.

Looking for something with good quality light transmission but no outrageously expensive. anybody have experience? reviews?
 
I've got a Genius variable ND.
I hardly ever use it, but it tends to add a vignette to the image.

I hardly use it, because I normally use cameras with built-in NDs, so I can't give you a real verdict :P
 
The only NDs I would recommend are
Tiffen
Schneider
Formatt HiTech

And the best ones are

Tiffen Water white
Schneider True Match
Formatt Hitech Firecrest

They're not cheap - but look at it this way. If you're going to put a $2000 lens on your camera, why would you then 'ruin' it by putting a $30 piece of glass on the froint??
 
I recently got the Tiffen variable ND filter. It's fair to say I did a bit of agonizing over what filter/s to buy. If you go through the reviews of that filter on B&H and Amazon (I don't recall there being many reviews on Adorama), you'll see that most buyers/users report being happy with it, while there are some who report being quite unhappy with it. I'm glad to report I'm in the happy-with-it group. Though I've only used it for one day -- for a wedding.

Of course Jax is right, and I'd love to get one or more of the better performing and more expensive filters. But they are a lot more expensive. And I don't have anything like L glass or such. I was trying to talk myself into getting multiple and more expensive Hoya and B+W fixed ND filters. But that was going to be more expensive, too expensive. And because my priority was going to be trying to keep up with the fast paced demands of shooting a wedding, I went with the variable. There are plenty of reports of vignetting and the X-pattern problem on that filter (which it sounds like is just going to happen with the variable NDs because of how they work, at least with the cheaper ones) at it's darkest settings, but that's apparently (I don't know this to be true for sure) with stills, not video. And video was my main concern. I think it worked out well for me.

Be aware, if you go with a circular filter that just screws onto your lens, you may need or want to buy a larger lens cap to fit it, depending. For example, I bought the 58mm Tiffen variable to fit my 58mm Canon EF lenses. But I had to buy a larger additional lens cap to fit the filter's outside diameter (a 67mm Canon lens cap for about 10 bucks). And because being able to put a cap on the filter to protect it while on a lens was important to me. Tiffen does send along a nice enough pouch-thing with some tissue paper to store it in though.
 
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Single stop NDs will also, in general, give you better IQ than vari-NDs - it's a trade off of image quality vs versatility.
For narrative shooting, single NDs are fine, but for events etc. you might need a vari-ND.
 
it's all in the subject.

Looking for something with good quality light transmission but no outrageously expensive. anybody have experience? reviews?

Hope you held off a week on the a7s purchase, now that the a7sii is announced with some great new features.

They also are shipping the a7rii, and despite not being as good at video, I probably want one of those.
 
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