Macro Lens Vs Normal lens ?

[rupal]

Does a high end dedicated Macro Lens like a (Luminar or Macro Symmar HM) Need the same amount of bellows extension as a non dedicated macro lens Of the same focal length, If focused at a subject the same distance from the lens ?

cheers.

[Steve Hamley]

Yes, the only difference is that the lens aberrations are minimized at higher magnifications. And a 120mm macro lens will not, or barely cover at infinity.

Cheers, Steve

[Peter K]

In the first view a lens is a lens. For a certain image scale (M) with a certain lens with a certain focal-lenght (f') the bellows-extention (b) is

b = f' * (M + 1)

As Steve mentioned before, every (compound-) lens is optimized for a certain image-scale.

Peter

[Pavel+]

I'm curious about this as well.

[rupal]

Is anyone aware of a calculator\tool that will calculate the Bellows Extension needed for a given Focal Length & Subject Distance ? My maths is not the best.

cheers

[Jon Wilson]

Is anyone aware of a calculator\tool that will calculate the Bellows Extension needed for a given Focal Length & Subject Distance ? My maths is not the best.

cheers


Check out the article in this forum:

http://www.largeformatphotography.info/bellows-factor.html

Jon

[Lachlan 717]

Watch this:

http://www.youtube.com/user/tomonator60#p/u/5/kaBnmWuL32E

About half way through, Thomas talks about bellows factor. Seems to be a pretty easy way to estimate the compensation.

Probably not super accurate (maybe not down to 1/3 stop, that is!!), but easy to get your head around.

[Bob Salomon]

If there focal length and there flange focal length are the same. then yes. If the FFLs are different then no.

[Bosaiya]

If you have a dial meter (not digital) and a ruler you can accurately get the bellows extension factor without using any math. It's what I do for all my macro work.