Lens hoods
Dec 18, 2019 19:20:36 #
Yes I know dslr's and video cameras can use both round or rectangular lens shades but why are round type basically found on DSLR and rectangular basically found on video cameras?
Dec 18, 2019 19:34:03 #
Don't know for a fact, but I suspect it is because video cameras generally shoot 16:9 aspect ratio as compared to 3:4 for DSLRs.
A round lens hood that worked for the 16 side would not be very effective on the 9 side.
A round lens hood that worked for the 16 side would not be very effective on the 9 side.
Dec 18, 2019 19:41:57 #
mas24
Loc: Southern CA
I have noticed that TV video cameras have square lens hood. I remember when HD TV was in its infancy. That, a selling point for that TV, was that they had a 16.9 screen format. Makes sense to me. I'd like to hear an alternative reason though. If there is one?
Dec 18, 2019 20:00:28 #
rwilson1942 wrote:
Don't know for a fact, but I suspect it is because video cameras generally shoot 16:9 aspect ratio as compared to 3:4 for DSLRs.
A round lens hood that worked for the 16 side would not be very effective on the 9 side.
A round lens hood that worked for the 16 side would not be very effective on the 9 side.
I agree with this and will add that rectangular is the most efficient shape for all formats . I also think round is easier to make and cheaper so appeals to a broader market (DSLR)
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Dec 18, 2019 20:04:57 #
GENorkus wrote:
Yes I know dslr's and video cameras can use both round or rectangular lens shades but why are round type basically found on DSLR and rectangular basically found on video cameras?
That is just not so, round or rectangular lens shades are found equally emong those cameras! The lenses used are what dictates the shapes of the hoods!
Dec 18, 2019 20:34:36 #
In modern video, the format is 16:9 and a round shade would vignette into the image area. Otherwise, it makes zero difference as both block the unwanted stray light equally well. Just comes down to your personal preference.
Mark Lent
Mark Lent
Dec 18, 2019 21:10:57 #
The shape of the sensor dictates the shape of the petal shaped hoods. It blocks as much stray light as possible without darkening the corners. I made this sketch once for an article in my camera club's newsletter.
Dec 18, 2019 21:16:58 #
Dec 18, 2019 21:19:51 #
The rectangular petal style hoods are used on wide angle lenses, especially wide zooms, while the circular ones are used for longer lenses.
Dec 18, 2019 21:20:13 #
My Hasselblad lenses all use square filters, as do my Bronica SQ lenses.
I agree that a rectangular lens hood on a camera with rectangular image dimensions is the best way, probably the second is the dedicated tulip type.
I agree that a rectangular lens hood on a camera with rectangular image dimensions is the best way, probably the second is the dedicated tulip type.
Dec 18, 2019 21:26:00 #
pendennis wrote:
My Hasselblad lenses all use square filters, as do my Bronica SQ lenses.
I agree that a rectangular lens hood on a camera with rectangular image dimensions is the best way, probably the second is the dedicated tulip type.
I agree that a rectangular lens hood on a camera with rectangular image dimensions is the best way, probably the second is the dedicated tulip type.
Yes, most upscale camera/lenses use rectangular hoods ...
Dec 19, 2019 05:39:56 #
It's all relative to the angle of incoming light combined with the shape of the sensor (rectangle). So the petal-shaped hoods are used on fixed wide angle and zoom lenses that can go wide. If they didn't have the cutouts on the hoods you'd end up with corner vignetting on the photos.
That's why all the long lenses all have round hoods...they don't need the cutouts.
That's why all the long lenses all have round hoods...they don't need the cutouts.
Dec 19, 2019 06:14:08 #
billnikon
Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
GENorkus wrote:
Yes I know dslr's and video cameras can use both round or rectangular lens shades but why are round type basically found on DSLR and rectangular basically found on video cameras?
Not totally correct. Many of the newer Nikon lenses have them, Nikon 18-80 2.8-4 for example.
Dec 19, 2019 06:37:35 #
I bet it's because they're easier to make and less bulky to carry. Try reversing a rectangular shade on a lens.
Dec 19, 2019 07:23:59 #
GENorkus wrote:
Yes I know dslr's and video cameras can use both round or rectangular lens shades but why are round type basically found on DSLR and rectangular basically found on video cameras?
I don't know either but I have a collection of old vintage lenses and love the old metal rectangular hoods they came with back in the day. I will say that one possibility is that the old rectangular hoods are actually much larger than the circumference of the lens, they extend out on all sides, the petal hoods of today are designed with different sized sides and use cutouts so as to not interfere with the image where the rectangular hoods were simple extended out on all sides to avoid blocking or shading the image.
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