Using the Neewer Ring Flash with the Sigma 180mm macro lens
Jul 18, 2017 23:18:33 #
Jerry Green
Loc: Huntsville, AL
The largest filter adapter that comes with the Neewer Ring Flash is 77mm. The Sigma 180mm uses an 86mm filter. Would there be a problem using a 86mm-77mm step down ring?
Jul 18, 2017 23:55:26 #
Vignetting is always at play when using a step down ring. However, you might be able to use the center portion of the lens with cropping in mind.
Jul 19, 2017 08:14:22 #
Maybe another way to use this ring flash with this lens is to no longer use it as a ring flash. There is this solution:
Jul 19, 2017 08:42:20 #
You must have the f2.8 unit, I have the 3.5 and it's only 72mm and fits well. As mentioned above you might get a vignette but you won't know till you try it. Unfortunately, as good as this ring light is, it's limitation is it's size but I don't know of one that will fit on an 87mm lens.
Jul 19, 2017 08:54:37 #
Crop camera or Full Frame ? If a crop camera you might be OK...
Jul 19, 2017 15:01:16 #
Screamin Scott wrote:
Crop camera or Full Frame ? If a crop camera you might be OK...
Wouldn't it be the opposite? The full frame would give you a "wider view" which you could crop--including any vignetting.
Jul 19, 2017 15:05:02 #
LoneRangeFinder wrote:
Wouldn't it be the opposite? The full frame would give you a "wider view" which you could crop--including any vignetting.
The "crop" camera only utilizes the central portion of the lens. Vignetting would be more likely on a full frame camera as it would capture info from the entire field of view, not a cropped portion. Thus cropping out vignetting would likely not be needed to be done when using a crop sensor camera.
Jul 19, 2017 18:22:27 #
IDK. Still not computing with me. I see it like this: any vignetting would occur on both a full frame and a cropped sensor. The crop on a full frame (to remove the shading from the vignette) would effectively become more like the view,from a cropped sensor. The ASPC sensor would also require cropping to remove the vignetting.
Not trying to be argumentative....
Not trying to be argumentative....
Jul 19, 2017 21:18:03 #
I think Screamin Scott is right. I am not fully versed in the facts (heck, I know he is more experienced in this stuff than I am), but I am pretty sure I have read in many places that a crop sensor gives an image that is a bit more 'zoomed in' than a full frame b/c it 'sees' only a smaller central area of the image that is seen by a full frame. That is an advantage of a crop sensor for close photography, but a disadvantage for wide field photography. So if you mount this ring flash on your lens with a step down adapter on a crop sensor camera, you should either have no vignetting or less vignetting.
Jul 19, 2017 21:38:22 #
Jerry Green
Loc: Huntsville, AL
Thanks for your help and comments. I will use the lens on FX and DX cameras and maybe CX. I think now that the vinetting would only be an issue on FX
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