No focus points

[Dolby]

If you're taking a landscape shot - or evening shot of the city skyline - and there no focus point or its too dark to focus ... What's the best way?

Could setting a high F stop (ie 32 or higher) make everything in the frame clear? But then beef up ISO or tripod with higher exposure to compensate for light?

 

[bwana]

There's almost always something you can focus on, even if only manually.

Most lenses have a sweet spot somewhere in the mid-range aperture where they are sharpest. F/32 probably isnt it . . . and you'd risk seeing every little flack of dust on your sensor.

Have a look at this http://en.wikipedia.org/wiki/Hyperfocal_distance

 

[Dolby]

Thanks bwana.

I'll read it.

Out of interest, why would I risk seeing speck of dust?

 

[bwana]

Thanks bwana.

I'll read it.

Out of interest, why would I risk seeing speck of dust?

One of the more advanced pixel peepers may be able to answer your qn better but I did find this as a possible explanation.

The small aperture makes the light rays between the back of the lens and image sensor parallel to one another and perpendicular to the glass sensor cover.