I would definitely play around with it. Your not going to want to go too wide with 4 because odds are they will move around a bit and you’ll end up with some soft faces. Some key things to remember would be try to keep their faces all on the same plane of focus, that will allow you to shoot a little wider. Generally with 4 kids I would aim to shoot around f/4 but certainly play around. At that aperture you may want to consider moving them further away from the background. Keep in mind the closer you are to them and the further away from the background they are the more bokeh you will get!
In the shot above I used a two light setup. The main light, camera left, is a Profoto D1 1,000Ws head inside of a 50 inch Westcott Apollo Softbox. While the idea of mixing what is considered to be a high-end strobe with a budget softbox my not sit right with some, I find the indirect lighting source from a Westcott or Photek to give a really nice and even light. The 60 inch Photek Softlighter, which I also enjoy using, may only cost $95 but gives a really nice, soft, and even light. If these lower cost indirect sources are good enough for the likes of Mario Testino and Annie Leibovitz, then they are good enough for me. Clay Cook did an great article on these lighting sources, "Lighting Like Leibovitz," that you can find here.
The backdrops not high definition, will some blurred,so need distance to take pictures. Also many large format images may seem a little pixelated when you view it up close but I make sure that only suitable images are used for the drops to provide the most realistic look possible.Please keep in mind that all computer screens vary in color calibration.
What this tells us is that the further away the light source is from the subject and backdrop, the more likely we are to get an equal exposure from one to the other. The quality of the light source can also change with distance. You will notice that as the light gets further away it becomes a harder light with less transitional values. Also, if the subject appears to be further away from the backdrop in the last image, it's due to me needing to use a shorter focal length (zoom out) to avoid getting the softbox in the shot. The shorter focal length exaggerates perspective.

This is the Meking background support system with a crossbar that telescopes from 77cm to 200cm. It can hold paper or cloth backgrounds to a maximum of almost 200cm.   Item features: Heavy duty 18mm,22mm and 25mm diameter tubes holds the heavy backdrop or drapes light background stand convenient for on-location work where portability is required The three legs spread out quickly and are freestanding Special locking system and the power clamp designed for stability and secure the backdrop usage   Item features: The lowest height of tripod: 77cm The highest height of tripod:200cm Crossbar length: 3 segments about 200cm Crossbar diameter:25mm.

Breaking news: Bokeh is in! With Lastolite’s Out of Focus Backgrounds, you won’t need to fiddle with your camera’s aperture to mimic that dreamy depth of field. There are a pair of double-sided backdrops in the Out of Focus line: one features a blurred seascape/autumn foliage, and the other sports summer foliage on one side and city lights on the other. At 4 x 5 feet, these backdrops should handle close to full-length portraits and will collapse to about a third of their size for transport. They weigh in at 3.3 pounds and come with their own carrying case. 
The Julius Studio background curtain set features an aluminum alloy construction to ensure durability and portability, and photo clams made of synthetic nylon to provide a strong grip and prevent the canvas from slipping out. Another great thing is that it’s adjustable in width (5-10.3 ft) and height (2.6 -7.5 ft). In addition to this, the set includes quality sandbags for stability.
Studio Light Video Photo Softbox Photography Kit Muslin Backdrop Lighting Kit Package Content: (2) Light Holder w/ Silver Black Softbox Reflector (2) 24" White Square Umbrella Reflector (2) Studio Single Light Holder (4) 7ft Tall Alumium Light Stand (4) 45Watts Day-Light Bulbs (1) Backdrop Support System w/ Carrying Bag (1) 5'x10' Green Backdrop Screen (1) 5'x10' Black Backdrop Screen (1) 5'x10' White Backdrop Screen (4) Backdrop Helper(Clip) ( Free Gift) * Item color may slightly differ from photos due to varying monitor display and settings.
A. Many photographers choose a continuous lighting set as a introductory set because of its low starting price. Additionally, continuous lighting allows you to control shadows, and to take the time to figure out the exact camera settings to use. However, continuous light generates heat, so if you’re shooting portrait photos, your subjects could grow uncomfortable.

Shooting on a clean white backdrop can be one of the more complex in-studio lighting setups around. Properly exposing for full lengths while giving your models room to work can require four or more extra lights and considerable amount of setup time. While taking the time to take care of the details is important for getting the perfect image and saving yourself hours of retouching on the back end, sometimes you just want to get a nice clean background without the hours of prep.
The Emart portable background support kit features adjustable crossbars, an aluminum alloy construction for portability and durability, heavy-duty spring clamps, and heavy-duty nylon sandbags. Another great thing about this product is that it comes with a bag so that you can take it with you on your trips. What’s more, you can adjust the height from 2.6 to 7 ft and the width from 5 to 10 ft.
Even shooting on location you can achieve some background lighting magic. The sun moves around throughout the day — think east to west as well as dawn to dusk. Analyze what time of the day the sun will project the light on your subject at the desired angle. Note: Hard light (direct sun) will create darker shadows while diffused light (cloudy overcast) will create softer shadows.

Football season is nearly upon us and Backdrop Express’s sports and stadium-themed printed backdrops are a great way to capitalize on the bone crunching. They’re available in poly paper or vinyl in either 4 x 5-foot or 5 x 6-foot sizes, or a fabric with sizes ranging from 5 x 6.5 feet up to 10 x 10 feet in a choice of light or heavyweight. The poly paper version is water resistant and has a matte finish. If you opt for vinyl, you’ll get a more durable backdrop that’s also water resistant and has a matte finish. The heavyweight fabric is a polyester/cotton knot that’s washable and wrinkle resistant with a sewn-in rod pocket. The lightweight fabric is a 100 percent polyester weave that Backdrop Express likens to a tablecloth. It, too, is wrinkle resistant, though less than the heavyweight fabric. On the plus side, Backdrop Express says the printed design is “slightly clearer” on the lightweight version. Decisions, decisions. 
It may be our summer issue but winter isn’t all that far off (sorry), and with White House Custom Color’s Through the Woods backdrop, you can put your subjects in a Robert Frost-esque scene without the frostbite. Like the other backdrops in WHCC’s collection, this one is made of wrinkle-free, 100 percent polyester fabric. It’s sold in either 10 x 8-feet or 6 x 8-feet sizes.  
Like other photo backdrop materials, polyester also comes in various sizes and colors. An advantage of this fabric is that it’s wrinkle-free. If there are heavy wrinkles, it can easily be removed by warm ironing from the back or by steam ironing it when it’s hung. It also includes rod holes that are perfect for hanging, especially if you don’t have a place to store it after using.
Among a raft of new products, Denny’s Fair Tale Trail puts your subject in a whimsical (dare we say Hobbit-esque) setting. The backdrop is available in your choice of three materials: Freedom Cloth, which is a wrinkle-free polyster that’s washable and dryer safe; Twist Flex, which uses the Freedom Cloth material but mounts it to a wire frame that can be folded down tight if you envision travelling a lot with the backdrop. Lastly, it’s available in canvas, which is a more delicate backdrop that ships with a wood mounting and Velcro straps. Sizes vary with Freedom Cloth, giving you the widest selection of size options.
If you're looking for photography lighting kits for beginners, keep an eye out on product descriptions to make sure your kit contains these two essential elements. The type of lighting kit photography you'll need will be dependent upon whether you take your photos inside or outdoors. You can find affordable photography lighting kits for beginners on eBay with many options to chose from.
Please keep your expectations realistic: this is a $30 backdrop that will be delivered to your door. This is not fancy. This isn't printed on the best of materials, but do you need it to be? If you're a professional photographer who has worked with backdrops that are $200 a pop, you shouldn't waste your time with this one. But if you're like me, just cutting my teeth out on this business, this is a fine investment that is fun and easy.
With a 20 or 24-foot long backdrop you’ll be able to cover just about every style of portraiture and product photography. These backdrops are great if you want to photograph a larger family full-length, or have a video shoot that requires movement. These long backdrops are great for when you want to pull your subjects far from your backdrop as well.
So why only 4 stars and not 5? I personally don't like the very top of the backdrop. If you look at the pictures carefully (I don't know if you can actually see this because I tried to crop these out), it looks like there are ceiling lights on a dark alley street. Scientifically, that's impossible and realistically, it looks WEIRD. But other than that, it's near perfect for what you're paying for.
There's no hiding the fact that the LimoStudio 3-Piece Softbox Set is a bare-bones package. The only accessories included with this package are three stands, three softboxes, 12 bulbs, and a case. The boxes and stands are of a good size, and the stands are adjustable to different angles. In the end, however, brightness (and a budget price) are the features that make the LimoStudio a standout.
Like other photo backdrop materials, polyester also comes in various sizes and colors. An advantage of this fabric is that it’s wrinkle-free. If there are heavy wrinkles, it can easily be removed by warm ironing from the back or by steam ironing it when it’s hung. It also includes rod holes that are perfect for hanging, especially if you don’t have a place to store it after using.
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