This is from the Post ask your questions here.
https://www.modelmayhem.com/p.php?thread_id=252362

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OK question:
What is the difference in lighting between a softbox and an umbrella, given the same color, relative size and light source? Or is there a difference?

Good question!  Given all other size and color constraints what are the differences.  First the obvious is ease of setup, an umbrella is far easier to transport, and setup, tend to be on average much cheaper and more flexible as one umbrella will work with just about any light while most softboxes need a dedicated speedring for each brand of head.

But no one cares about any of that as its not really important in reality of use, what is is the difference in control and quality of light from each. 

Softboxes:
the primary advantage of a softbox is control, it allows you to control spill and hotspot.  Yes softboxes have hotspots, the better they are designed the more it is minimized but if the light feathers it means that there is a hotter pot than not and thats a hotspot.  the shape is that of a parabolic, and while some light passes directly through from the rear mount through the diffusion panels outward the majority of the light is bounced around in the box and directed forward based on the exact shape and design of the box to create a softer wrap and fill quality of light in a directed manor.  A silver lined box is more efficient and more specular creating a less even distribution of light across the front panel, and white is softer, less efficient and allows for more even distribution of light across the front diffusion panel.  The deeper the box the more even the light will be coming from the front of the source.  And internal baffle or diffusion panel creates a further softening by cutting more of the direct light and creating a bounce effect overall prior to the front panel.  Grids can be used to further direct the light in a specific direction and reduce spill considerably.  louvers are also able to control spill but only in a horizontal or vertical direction.  Removing the inner panel creates a more contrasty light with a stronger hotspot and deeper falloff.  Removing the outer panel while retaining the inner diffusion panel creates a more umbrella like lighting effect, although it still retains some more directional qualities it ads some snap and specularity to the light.

Umbrellas come in two main style (material aside) shoot through or bounce.     Umbrellas provide a soft diffuse light with soft shadows and a smooth highlight to shadow transition.  Silver is slightly more abrupt transitions from highlight to shadow giving the appearance of a snappier light and produces a more specular light on shiny surfaces, which is a benefit to jewelry, and fabrics with rich textures although may be a hindrance to skin texture when the skin has many flaws or is lacking in a good even foundation.   Umbrellas spill all over and are extremely difficult to control and or flag since barn doors are not easy to work on them, thet may be cut with cutters placed between the lightsource and the subject but at the point this is an option most would find it preferred to use a softbox instead.  This is very apparent on dark or low key shots where the soft light is desired but spill is interfering with a background shadow area.  They offer little in control but are great soft light sources and in general are so inexpensive that they are worth having in addition to softboxes, and may often be perfect especially in hi key shoots where the spill works in favor of filling and softening shadows.

Shoot through umbrellas are similar in that they offer little to no control of the spill, and bounce light all over, but they produce a direct hotspot in the center which comes from the light being directly aimed out of the front face of the umbrella.  This produces a hotter center with soft falloff.  The second drawback or benefit is that much of the light goes through and a percentage is bounced back toward the light and behind, in small spaces this bounced can bounce around off walls and provide a soft fill or may in fact be a hindrance not only in the waste of light power, but by flaring back toward the photographer.  The hotspot may work in your favor in hi key situations in that you may aim the hotspot behind the subject where the main subject is lit by the softer fall off and the hotter light is directed toward the background. 

Black backed white convertible umbrellas are a good value for many as they work as a very soft white bounce with the backing controlling spill or can be used as a shoot through.  I personally almost never use actually shoot through's but have found that for outdoor shoots, backed shoot through umbrella's, like the wescott halo or brolly box are more efficient in redirecting and somewhat softening the hotspot from a direct shoot through but keeping that slight hotter center and fast falloff.  They also prevent the bounce light from bouncing back toward the photographer and being wasted.

One of my favorite umbrellas is more of a halfbreed, it is a large soft white convertible bounce umbrella but has a front diffuser so that the light bounces back through the diffuser and out the front, making it an even softer and even more uniform smooth light, this is a 60 inch version of the photek softlighter 2 with removable shaft.  This is similar in concept to the exquisite but awfully expensive design on the Elinchrom 7' octabank.  That design is different from other octobox designs as it has no direct light as the head is placed facing the rear and the light bounces off the back of the design and out through two diffusers making the octabank an extremely soft and even beautiful light source.  The softlighter 2 is about $75.00 and for anyone serious about people photography it should be a must have for that price.  While not the same as the octabank, its design is that of a reflective diffused light and the removable shaft allows you to set up a full 5 foot diameter 10 panel round light and remove the shaft that protrudes allowing it to be moved into position extremely close without a shaft in the shot or in the way.  Something worth looking into.  It also works as a normal white bounce true 60inch diameter umbrella or normal 60inch shoot through as well, but the real quality of light is from the diffused nature that creates an amazingly soft even shadow free light quality for an amazingly low price. 


Hope this helps somewhat.



Stephen Eastwood
http://www.StephenEastwood.com

Stephen,

Thanks for the excellent reply, and yes it does help a lot. I appreciate all the time and effort you spent.

Jim

I wanted to thank too.  I did bought the softlighter 2 a few month base on your writtings on here.  One of my best purchase.

Also keep in mind, using a softbox produces a square catch light in the eyes of your subject or on your reflective item, where as the umbrella will produce a round catch light.  Like everything else, opinions vary widely on what looks "best"...

I prefer the round catch light of an umbrella, as I feel it looks more natural, but again, that is simply my opinion.

Thanks Stephen for that post. I picked up several good tips there.

Stephen I'm having trouble finding a UK source for the Softlight product.  Would you say this item on ebay was a reasonable approximation?

http://tinyurl.com/37fz4o

I'm planning a trip back to LA at some stage so may pick one up then but just through I'd ask.

Paul

Stephen,

An excellent responce. A great read! 

I've always been a fan of the Softliter and Eastwood is correct.

Another advantage of the Softliter is you can remove the black backing and use it as a huge shoot through umbrella, or just remove the diffusion screen and use it as a bounce umbrella.

I also like the Photek 52" Illuminata - its a double diffusion semi parabolic octabank but with a slight modification - the internal diffusion screen has a reflective spot in the middle for the hot spot and reflects the strobe back into the parabola and back out again.

You can either use the internal, external diffusers or both. Or neither. You can just point strobes into the reflective parabola in the same manner as the Profoto Reflectors. Its less than $200.00.

Thanks Stephen! Some great info here.

I'm a visual guy. I need pictures.

Excellent explanation of the differences!

I use them all for different reasons. I use Westcott's EPS HALO (EPS stands for Ed Pierce Signature Edition) for the mainlight on all of my high key stuff with 2 large black-backed umbrellas on the seamless, and a 72" silver light panel for fill. The HALO has the parabolic front of a GIANT shoot through umbrella, but a black back and silver lining inside. The light it puts out can be varied somewhat by either facing the light into the back silver lining, or facing it forward and shooting through the front.

For low key I love all my different softboxes- all for different reasons. Monte Zucker used to teach using tiny softboxes to get strong modelling of the face- but he also was a fan of heavy diffusion on the lens. Today giant softboxes have been way more popular. They create more like light coming from a bay window. I prefer a medium sized softbox myself. Lately, I very much like using shoot through umbrellas for portrait work because of the specular highlights and the varying size that I can make the hot spot and light source by moving the umbrella shaft back and forth. I go into detail on how I use all these on the posing and lighting dvd set I produced- but honestly the written explanation given by Stephen is excellent!!

So informative. Thanks for posting this!

Found the photek soft lighter II  on ebay cheap for who ever don't want to spend the $75 bucks or more .

http://cgi.ebay.com/PHOTEK-Professional … 286.c0.m14

I must echo what everyone else says. Thank you Stephen.