hmmm thks..will it be better to use a step up ring and get maybe a 86mm nd filter?
Definitely not...
You are bound to get vignetting if you do that.
Basically, the more you stack in front of a wideangle lens, the more likely and the worse vignetting you will get.
Is it really? For a 86mm on a 77mm, I think You'll need plenty of stacking up b4 the vignetting comes into play. I'd be more concerned with the extra $$$ to get a 86mm filter than a 77mmDefinitely not...
You are bound to get vignetting if you do that.
Basically, the more you stack in front of a wideangle lens, the more likely and the worse vignetting you will get.
Hi,
im thinking of getting an nd filter for my sigma 10-20(77mm).. may i ask what size of nd filter should i get to prevent vignetting issues? help appreciated
Another option is is to get those rectangular or square filters (Slot in) like Lee's or Singh Ray.:devil:
Definitely not...
You are bound to get vignetting if you do that.
Basically, the more you stack in front of a wideangle lens, the more likely and the worse vignetting you will get.
Is it really? For a 86mm on a 77mm, I think You'll need plenty of stacking up b4 the vignetting comes into play. I'd be more concerned with the extra $$$ to get a 86mm filter than a 77mm
no need expensive filters ma. any rectangular ND filter placed smack nxt to the lens will eliminate the vignetting. of course for very long exposures u cannot be handholding it always, and i tried using blue sticky tags to place the filters and lens in close proximity before :bsmilie:
( so much so for taking care of filters and lenses )
ryan
So if i use the 77mm fader filter vignetting wont really be noticeable rite? cuz i saw one in mass sale for $100
It will be visible at 10mm. Because its super thick, easily 10mm or so thick which is the thickness of 2 'regular' filters.
hmmm can tis be solved if i use a "fix-ed" nd filter? like say ND 4 or ND8 i guess that shud be thinner
It doesn't matter how much, or how little one stacks.
What matters is the angle that the stacking creates.
True. But TS was just asking generally......
If it wasn't for the angle, all those square/rectangular filters won't work cos the "mount" is already quite thick. :think:
But generally speaking, the more common step-up rings do introduce vignetting? Please correct if my understanding on this is wrong.
Depends ...
Some of the step rings are fairly slim - around 3mm, and some are thick, ard 5mm.
If you use a direct single 77-86 ring, and the filter is slim, it may work because the ring throws the angle outwards. Should be quite easy to calculate based on thickness and angle, and crop factor of camera, which I assume is 1.5x or 1.6x since TS is speaking of the Sigma 10-20 lens.
If you look at the hard-core bellows type lens hoods used in medium format or cinematic cameras, they kind of look very much like a gazillion step-ring of subsequently larger sizes stacked up.
I guess it depends on one's longer-term objectives, i.e., look at 86mm as a standard to stick to or slim 77mm filters.
i would just choose to get the single 77mm nd filter from dealextreme then only abt 12-13 sgd... qns nw is if i am shooting 30sec long exposure under broad daylight, what kind of nd filter shud i get(number) please advise xiao di