Any photographers here?

[jefferson1]

e video lo distance  ela decide chesadu... minimum distance

 

 

[dasara_bullodu]

Prati lens ki minimum focal distance different untundi

[jefferson1]

1 minute ago, dasara_bullodu said:

Prati lens ki minimum focal distance different untundi

a video lo subject should be 6-7 ft annadu when using 50mm lens

 

i would like to know how he decided that...same cheppadu ( diff mesaurements) vere lens gurinchi kuda 

[dasara_bullodu]

Distance from lens to subject = focal.length(real.subject.size/subject.size.on.sensor)

In other way

 

subject.image.size/subject.real.size = focal.length/distance.to.subject

[tom bhayya]

@rapchik

[galiraju]

1 minute ago, jefferson1 said:

a video lo subject should be 6-7 ft annadu when using 50mm lens

 

i would like to know how he decided that...same cheppadu ( diff mesaurements) vere lens gurinchi kuda 

listed on the manual....also you wont able to focus if you are below that distance.

 

How to Calculate Lens Working Distance

By lens working distance, I am referring to the distance from the end of the lens (or the end of the lens hood if in place) to the subject. This is the amount of space you have to work in.

While lens working distance matters little to most of my shooting, there are situations where knowing the distance in front of the lens matters. Macro photography at MFD (Minimum Focus Distance) is typically the situation where working distance matters the most and other than physical obstruction (such as a lens hood bumping into part of the subject), frightening away the subject is usually the biggest issue.

Lens manufacturers always include the MFD (Minimum Focus Distance) in their list of specs, but the MFD spec is based on the distance from the subject to the imaging sensor, not from the end of the lens or lens hood to the subject. This is no problem, as data from the site's Lens Specifications and Measurements tool along with a simple calculation will provide the needed from-the-end-of-the-lens working distance.

Simply take the "measured" LL (Lens Length – with or without hood) and add 1.4" (36.4mm) to account for the Canon EF and EF-S lens mount imaging sensor-to-electrical-contact distance (ISCD). The Nikon F lens mount ISCD value is 1.6" (40.5mm). Subtracting the total imaging sensor to end-of-lens distance from the MFD (you can use this site's measurement or the manufacturer spec) provides the WD (Working Distance) for the lens at MFD. I'll make this a formula:

WD = MFD - LL - ISCD