Flashes make a picture darker

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Jemby
Posts: 2
Joined: Tue Mar 23, 2021 7:08 pm

Flashes make a picture darker

Post by Jemby »

Hi. I am not good at taking pictures.
But I take pictures of extremely small insects to publish a scientific article.

A few days ago, I set new pieces of equipment.
Canon 90D + Canon 70-200mm + Mitutoyo 10x, 50x, 100x

I tried to use new ones.
However, when I took a picture using two strobo flashes with a camera flash, it was too dark even more than using the camera's flash only.
So I tried to use only one strobo in 1/128, then it worked. but when I tried with 1/16, it was darker than the latter.

How could this happen?
p.s. I used Manual mode. So It would not be from camera mode.

Please answer me

MarkSturtevant
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Joined: Sat Nov 21, 2015 6:52 pm
Location: Michigan, U.S.A.
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Re: Flashes make a picture darker

Post by MarkSturtevant »

That is a puzzle! But here is a discussion about a similar problem, and maybe your answer is in here:
https://photo.stackexchange.com/questio ... darker-why
Mark Sturtevant
Dept. of Still Waters

Jemby
Posts: 2
Joined: Tue Mar 23, 2021 7:08 pm

Re: Flashes make a picture darker

Post by Jemby »

MarkSturtevant wrote:
Thu Mar 25, 2021 5:37 pm
That is a puzzle! But here is a discussion about a similar problem, and maybe your answer is in here:
https://photo.stackexchange.com/questio ... darker-why
Thank you, MarkSturtevant.
I read some posts in the link.
I figured out what was the problem.

I had no idea about TTL mode. In this mode, the flash fires twice very quickly. so, the strobes don't have enough time to recharge.
I turned off TTL mode, and it is fixed.

Thank you.

rjlittlefield
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Location: Richland, Washington State, USA
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Re: Flashes make a picture darker

Post by rjlittlefield »

Good catch! That was a tricky problem, and I wondered what the solution would turn out to be.

--Rik

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