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Old Mar 9, 2011, 11:36 PM   #1
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Default How much better is f1.8 over f4? See yourself...

Saw few red foxes in the parking lot this evening and took some pictures with 50mm f1.8 and then with the 55-250mm lenses.
These are not good shots by any means but they demonstrate the aperture and amount of light coming through them.
Only re-sized and slightly sharpened.

IMG 1797 (darker one) is taken with the 55-250mm at f4 which is it's widest aperture.
1/30s, ISO-1600, Exp +5, no flash, 55mm, 6:22pm.

IMG 1793 (brighter one) is taken with the 50mm at f1.8 which is it's widest aperture.
1/30s, ISO-1600, Exp +5, no flash, 50mm, 6:21pm.

You can see how much better f1.8 picture is.
It looks like the picture is taken in bright light with 50mm but completely dark with the 55-250mm lens.
I can just imagine what f1.2 can do.
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Old Mar 10, 2011, 10:09 AM   #2
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Originally Posted by Mystery123 View Post
Saw few red foxes in the parking lot this evening and took some pictures with 50mm f1.8 and then with the 55-250mm lenses.
These are not good shots by any means but they demonstrate the aperture and amount of light coming through them.
Only re-sized and slightly sharpened.

IMG 1797 (darker one) is taken with the 55-250mm at f4 which is it's widest aperture.
1/30s, ISO-1600, Exp +5, no flash, 55mm, 6:22pm.

IMG 1793 (brighter one) is taken with the 50mm at f1.8 which is it's widest aperture.
1/30s, ISO-1600, Exp +5, no flash, 50mm, 6:21pm.

You can see how much better f1.8 picture is.
It looks like the picture is taken in bright light with 50mm but completely dark with the 55-250mm lens.
I can just imagine what f1.2 can do.
Definitely with lower light faster apeture is way better! Just a stop can make a world of difference!
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Old Mar 12, 2011, 8:21 AM   #3
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i did switch. i had the 1.8 for the longest time. But i got lucky the camera shop that i get alot of things from. gave me 100% of my money back and let me put it towards the 1.4. I think it was well worth it in the long run.
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Old Mar 12, 2011, 10:46 PM   #4
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i did switch. i had the 1.8 for the longest time. But i got lucky the camera shop that i get alot of things from. gave me 100% of my money back and let me put it towards the 1.4. I think it was well worth it in the long run.
That'll be my next upgrade but not soon since I am just starting to use the f1.8.
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Old Mar 13, 2011, 4:43 AM   #5
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G'day all

sniper ... your comment is correct - your maths not quite

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Definitely with lower light faster apeture is way better! Just a stop can make a world of difference!
f4 > f2,8 > f2 = 2 stops
f4 > f2,8 > f2 > f1,7 = 2-1/2 stops

I have an f1,2 super-takumar for pentax M42 in my lens collection - pity it doesn't get out much these days

Regards, Phil
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Old Mar 14, 2011, 10:17 AM   #6
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G'day all

sniper ... your comment is correct - your maths not quite



f4 > f2,8 > f2 = 2 stops
f4 > f2,8 > f2 > f1,7 = 2-1/2 stops

I have an f1,2 super-takumar for pentax M42 in my lens collection - pity it doesn't get out much these days

Regards, Phil
I know that, I was commenting on the fact that not only was the difference in what he showed considerable, but that EVEN a stop can make a world of difference in a lens.
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