Learning Photography - A question about Shutter Speed and F Stops

6 months 2 weeks ago - 6 months 2 weeks ago #659631 by BlurredLines
Hello,
As I casually meander down the road of learning photography I find the journey very enjoyable, still I'm occasionally finding pot holes that trip me.

Right now I'm using a Fuljifilm HS10 and a Canon SX20is.   Older, but all I can handle right now.

What I'm wondering is about MANUAL Mode.

When I'm in Manual Mode, I was under the (obviously false) impression that I could "Manually" set the ISO, f/Stop(aperture?) and Shutter Speed where ever I wanted to but all too often I find this not the case and I'm already sure there is a perfectly good reason, but I've not risen to that level.....yet.

Specifically, why is it that in Manual Mode if for example the shutter speed is set to 1.6 and ISO is set to 800 that I cannot set the aperture to less than 3.6?
(I can raise the Aperture all the way to 8.0, but it refuses to allow a lower Aperture number (Larger Aperture opening?)

Thanks.  This is one of those things I have not been able to resolve through my own research.


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6 months 2 weeks ago #659645 by Shadowfixer1
Most likely due to where you have set the focal length on the lens. On the Fuji the widest focal length would allow an aperture of f-2.8. The more you zoom to a longer focal length, the minimum aperture increases. At the maximum telephoto end your minimum aperture increases to f-5.6. Generally the minimum aperture increases quickly on these type of cameras. I would say as soon as you start zooming the lens the minimum increases from f-2.8 rather quickly.  
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6 months 2 weeks ago - 6 months 2 weeks ago #659647 by BlurredLines

Shadowfixer1 wrote: Most likely due to where you have set the focal length on the lens. On the Fuji the widest focal length would allow an aperture of f-2.8. The more you zoom to a longer focal length, the minimum aperture increases. At the maximum telephoto end your minimum aperture increases to f-5.6. Generally the minimum aperture increases quickly on these type of cameras. I would say as soon as you start zooming the lens the minimum increases from f-2.8 rather quickly.  


Thank you ShadowFixer.   In this case, I was not using ZOOM at all.  But I did find that if I changed the ISO to 1600, then it allowed me to change the Aperture to it's most open setting (lowest available number).   Being so new to this all, I'll have to ponder that a while.

So is it safe to say the camera will prevent you from making settings that are way off, even in manual mode?


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6 months 2 weeks ago #659662 by Shadowfixer1

BlurredLines wrote:

Shadowfixer1 wrote: Most likely due to where you have set the focal length on the lens. On the Fuji the widest focal length would allow an aperture of f-2.8. The more you zoom to a longer focal length, the minimum aperture increases. At the maximum telephoto end your minimum aperture increases to f-5.6. Generally the minimum aperture increases quickly on these type of cameras. I would say as soon as you start zooming the lens the minimum increases from f-2.8 rather quickly.  


Thank you ShadowFixer.   In this case, I was not using ZOOM at all.  But I did find that if I changed the ISO to 1600, then it allowed me to change the Aperture to it's most open setting (lowest available number).   Being so new to this all, I'll have to ponder that a while.

So is it safe to say the camera will prevent you from making settings that are way off, even in manual mode?

I'm not familiar with these cameras but they shouldn't prevent you from setting what ever you want in manual mode. I have no other answer, sorry. 

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6 months 2 weeks ago #659684 by garyrhook
I'm not familiar with either of those, but I can say this:

The maximum aperture (lowest f-number) is dependent upon the lens. Some lenses have a constant maximum aperture, some have variable. When the aperture is variable, it depends upon the focal length (as stated above). If you want to play with manual mode, suggest you pretend you have a prime lense and set your focal length to one value, and leave it there. Then experiment with aperture/SS/ISO. Once you have those concepts in your head, introduce the lens variable and learn how that affects things.

As for why there would be a limit to the aperture based on settings other than what then lens is capable of, search me. That would be new and unique.


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