WB01343_1.gif (599 bytes)  Botanical Photography-10  WB01345_1.gif (616 bytes)

Aperture-Open-500Lab.jpg (113260 bytes)
f-4 - Maximal Aperture		 Aperturef32-500Lab.jpg (183131 bytes)
f-32 - Minimal Aperture

CameraLensfStop600.jpg (82818 bytes)The f-stops of this lens range from 3.5 to 11. They are controlled by a knurled ring which you can change while you are looking at your subject.
Link to Student Macrophotos  VioletMacroplusPlus.jpg (122193 bytes)

Effect of Shutter Speed on Light Meter Readings

Set the Shutter Speed to 60 and the ASA to 100.

Focus on a subject.ASASet-300.jpg (99665 bytes)

Locate the knurled f-stop ring on the lens.

Open the lens to f-4 & view the exposure needle.

Reduce the lens aperture to f-32 and watch the needle fall.
You can experiment on your own with various ASA settings.

 WB01343_1.gif (599 bytes)    Botanical Photography-10        WB01345_1.gif (616 bytes)