Lens hoods
Dec 19, 2019 09:35:22 #
RWR
Loc: La Mesa, CA
The front of all my lenses are round, and they all project a circular image at the focal plane - round hoods of the proper diameter and length are very efficient.
Dec 19, 2019 09:41:45 #
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.
DSLRs are actually 2X3
Dec 19, 2019 10:23:00 #
Alafoto
Loc: Montgomery, AL
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.
Possibly because both capture images in the square format?
Dec 19, 2019 10:27:15 #
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?
Leica has used rectangular lens shades for years.
Dec 19, 2019 11:01:29 #
A circular hood is mandatory when screwing a a lens hood over filters of any kind.
Dec 19, 2019 11:11:05 #
Kiron Kid wrote:
A circular hood is mandatory when screwing a a lens hood over filters of any kind.
Not so sure that is the case, filters have been around for a long time and I have rectangular hoods that work quite well with filters.
Dec 19, 2019 11:14:11 #
Dec 19, 2019 11:15:00 #
Blurryeyed wrote:
Not so sure that is the case, filters have been around for a long time and I have rectangular hoods that work quite well with filters.
When using a polarizer, etc, you must use round hoods. If using rectangular hoods, you will often be heavily vignetting the corners of the frame.
Dec 19, 2019 11:22:15 #
Kiron Kid wrote:
When using a polarizer, etc, you must use round hoods. If using rectangular hoods, you will often be heavily vignetting the corners of the frame.
Yes, but in your prior statement you said filters of any kind. My old Asahi Pentax hoods actually mount with a tension ring to the outside of the lens barrel, they are not the typical screw on so I am pretty sure that they will work with a polarizing filter.
Dec 19, 2019 11:27:26 #
Dec 19, 2019 11:43:39 #
I don’t have an answer, either, but my P900 had a petal and a round lens hood. No, I had to buy it separately. And the 18-135 lens for my A6300 came equipped with a round lens hood. They all seem to work, though.
Dec 19, 2019 13:24:41 #
Cracker-barrel Philosopher
Loc: Duluth, MN
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.
Hmmm, I thought Dslr's were 2:3. That's what 35 was and I thought full frames were, and even APS-c's.
Dec 19, 2019 13:52:06 #
billnikon
Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
Blurryeyed wrote:
Not so sure that is the case, filters have been around for a long time and I have rectangular hoods that work quite well with filters.
you are spot on.
Dec 19, 2019 15:00:38 #
CO wrote:
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.
Pixeldawg wrote:
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
What also enters into the type of hood is the focal length. Longer lenses angle of view may be narrow enough that a round hood (easier to make) is adequate to shield it from spurious light yet not impinge on the area viewed.
Dec 19, 2019 16:05:52 #
jerryc41 wrote:
I bet it's because they're easier to make
and less bulky to carry. Try reversing a
rectangular shade on a lens.
I bet it's because they're easier to make
and less bulky to carry. Try reversing a
rectangular shade on a lens.
Thaz why Tulip shades ... effectively
rectangular but neatly reversible.
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