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Godox Flash/80D
Nov 24, 2022 16:10:39   #
Amadeus Loc: New York
 
I have a Godox 860 I use on my Canon 80D. In TTL Auto mode the flash recognizes the lens on the camera. So a 50 mm lens shows 50mm in the display. Does the flash know it’s a crop sensor camera and adjust to 80 mm? Or does it have to? Should I be using the flash in manual mode and setting it to 80 mm.

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Nov 24, 2022 17:54:53   #
BebuLamar
 
I don't think the flash knows that your camera is a crop sensor camera. You can use it just like that but if you manually set the zoom to 80mm you would have a longer range.

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Nov 25, 2022 06:49:04   #
f8lee Loc: New Mexico
 
The flash needn't care - your lens is still a 50MM lens. Focal length does not change on a "cropped" camera, only the angle of view (which is why the marketing wonks created the shorthand of the "1.5 crop factor" - to make it easier for folks who were used to 35MM film have an idea of what kind of view the lens would give them).

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Nov 25, 2022 10:24:17   #
Amadeus Loc: New York
 
Ok. Thank you.

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Nov 25, 2022 10:47:49   #
JohnSwanda Loc: San Francisco
 
f8lee wrote:
The flash needn't care - your lens is still a 50MM lens. Focal length does not change on a "cropped" camera, only the angle of view (which is why the marketing wonks created the shorthand of the "1.5 crop factor" - to make it easier for folks who were used to 35MM film have an idea of what kind of view the lens would give them).


It does matter because the flash uses the lens setting to change the angle of coverage of the light. If you are using a 50mm on a crop camera, the flash covers the angle of view of the lens on a full frame. Setting it on the effective crop factor of length of the lens gives you more range on the flash.

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Nov 25, 2022 11:19:50   #
Amadeus Loc: New York
 
JohnSwanda wrote:
It does matter because the flash uses the lens setting to change the angle of coverage of the light. If you are using a 50mm on a crop camera, the flash covers the angle of view of the lens on a full frame. Setting it on the effective crop factor of length of the lens gives you more range on the flash.


So you’re saying I’m better off manually setting the flash to 80 mm. Sometimes I’ll get a severely over or under exposed shot. Thought that might be the problem. But generally the exposures come out ok. I’ll experiment with manual settings.

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Nov 25, 2022 13:52:56   #
BebuLamar
 
Amadeus wrote:
So you’re saying I’m better off manually setting the flash to 80 mm. Sometimes I’ll get a severely over or under exposed shot. Thought that might be the problem. But generally the exposures come out ok. I’ll experiment with manual settings.


Over exposed shot that isn't the problem. Under exposed could be the problem for the zoom setting wider than needed. In general setting the flash zoom head wider than needed doesn't hurt but it reduces the maximum distance you can shoot. If you bounce the flash I found somehow it doesn't make a difference.

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Nov 25, 2022 14:00:13   #
PHRubin Loc: Nashville TN USA
 
Amadeus wrote:
So you’re saying I’m better off manually setting the flash to 80 mm. Sometimes I’ll get a severely over or under exposed shot. Thought that might be the problem. But generally the exposures come out ok. I’ll experiment with manual settings.


While setting it manually to compensate for the crop factor would give more range, unless the distance is near the limits of the flash, I wouldn't bother, or if I were using a zoom lens. It would be more of a bother than it is worth. All that would be accomplished is a little longer battery life. However, if it is a fixed focal length lens, sure, it shouldn't hurt and saves batteries.

Severely over/under exposures are a different matter.

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