24-70mm f/2.8G Can't make stars?

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Panza

Senior Member
I've been trying to see how I can get the 24-70mm f/2.8G (non VR) to turn light into stars. I know it has 9-rounded aperture blades but on some of my other lenses, with rounded apertures, I can stop down enough and create them. I've been stopping down and testing through the aperture-range but I'm worried the 24-70 may just be a poor choice for what I'm wanting.

xbm8ScG.jpg

f/2.8

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f/4.0

BKyJ5iA.jpg

f/5.6

kHpAaZf.jpg

f/8.0

Fm1tjM7.jpg

f/11

CtE6L6U.jpg

f/16

4SM6BgZ.jpg

f/22

Personally I like f/16 best.
 
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Panza

Senior Member
Tested the range of aperture just now. It's hard to guess when they'll appear because through the viewfinder my eyes naturally create sunstars but they wont always appear in the DSLR created image. My previous walk around 35mm Voigtlander created beautiful stars at f/2.8 and f/4.0 with its straight cut blades.

But now that I know which aperture I need to start shooting at to get appealing looking stars...

I can get back to taking the kind of photos I want.

DSC_1656.jpg
 
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hark

hark

Administrator
Staff member
Super Mod
Panza said:
Tested the range of aperture just now. It's hard to guess when they'll appear because through the viewfinder my eyes naturally create sunstars but they wont always appear in the DSLR created image. My previous walk around 35mm Voigtlander created beautiful stars at f/2.8 and f/4.0 with its straight cut blades.

But now that I know which aperture I need to start shooting at to get appealing looking stars...

I can get back to taking the kind of photos I want.

View attachment 205377
Click to expand...

This was shot at 24mm, but if you zoom out to 70mm, the physical diameter of the aperture will change (become larger) even if you shoot at f/14 again. Apertures are smaller in wide angle lenses as opposed to telephotos. They are a ratio to the length of the lens being used. It all has to do with math.

To figure it out, take the focal length being used (24mm) and divide it by the f-stop (f/14).

24÷14=1.71mm diameter aperture

If you zoom out to 70mm, the aperture becomes larger. 70÷14=5mm diameter aperture
 
P

Panza

Senior Member
hark said:
This was shot at 24mm, but if you zoom out to 70mm, the physical diameter of the aperture will change (become larger) even if you shoot at f/14 again. Apertures are smaller in wide angle lenses as opposed to telephotos. They are a ratio to the length of the lens being used. It all has to do with math.

To figure it out, take the focal length being used (24mm) and divide it by the f-stop (f/14).

24÷14=1.71mm diameter aperture

If you zoom out to 70mm, the aperture becomes larger. 70÷14=5mm diameter aperture
Click to expand...

So you're saying that to make my lights turn into stars, the wider my focal length, the smaller my aperture will be, which makes it more suitable to creating pointed sources of light.

This would explain why I haven't succeeded in making these types of photos with my 80-200mm f/2.8 D even though I'm stopped down to f/22 and I'm shooting towards the sun in a forest. Maybe I should aim to stay below 2 FL/AP

Does distance from the subject also affect creation?
 
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hark

hark

Administrator
Staff member
Super Mod
Panza said:
So you're saying that to make my lights turn into stars, the wider my focal length, the smaller my aperture will be, which makes it more suitable to creating pointed sources of light.

This would explain why I haven't succeeded in making these types of photos with my 80-200mm f/2.8 D even though I'm stopped down to f/22 and I'm shooting towards the sun in a forest. Maybe I should aim to stay below 2 FL/AP

Does distance from the subject also affect creation?
Click to expand...

Yes, the wider your focal length, the aperture will be smaller. As far as distance from the subject, it will depend upon the size of the light source. If it is really big, it might not work quite as well. You'd just need to experiment.

Here is one with the sun as a source...although it isn't close.

Nikon 14mm lens
Aperture: f/22
Shutter Speed: 1/160
ISO 400

14501069567_62982fbd7f_h.jpg
 
Horoscope Fish

Horoscope Fish

Senior Member
hark said:
This was shot at 24mm, but if you zoom out to 70mm, the physical diameter of the aperture will change (become larger) even if you shoot at f/14 again. Apertures are smaller in wide angle lenses as opposed to telephotos. They are a ratio to the length of the lens being used. It all has to do with math.

To figure it out, take the focal length being used (24mm) and divide it by the f-stop (f/14).

24÷14=1.71mm diameter aperture

If you zoom out to 70mm, the aperture becomes larger. 70÷14=5mm diameter aperture
Click to expand...
Proving once again the fault, dear Cindy, is not in our stars, but in ourselves, that we are underlings.




I uh... I'm thinking I should probably just go ahead and make apologies for that now? ;)
 
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