(I hope it's ok to do two posts consecutively in order to keep my photos to the 8/per thread rule.)
I've seen some very nice, higher end DIY's on this forum, so this may seem a bit rudimentary. Not sure if this would be of any interest to anybody, but thought I would share a pretty easy and very cheap ($10 or less) way to make a custom foam insert to house a camera with attached larger lens.
I tried to search to see if this had been mentioned but did not see it, if it has I apologize.
Being this was my first 'real' lens I wanted to be sure the lens was well protected as well as being able to leave the lens attached to the body inside the bag. There seemed to be a few holster bags and shoulder bags that would have probably worked wonderfully, however a combination of impatience and O.C.D. can at times stray me off course.. way off course.
I had a shoulder bag that I had purchased just to carry around odds and ends and my P&S here and there. It was exactly the size of my T3i with 100-400 attached so I thought why not try to make this bag work.
I recently purchased in the camping section of my local 'Super Center' a "camping pad". It's basically a 1/2" foam pad that you can lay your sleeping bag on when out camping. (*SIDE NOTE* It was completely worthless for that).
All you need is a razor blade, the camping pad and glue. I used a shoe cement, however I'm sure contact cement would work just as well.
*I HAVE ALREADY PUT THIS TOGETHER, SO I'M ATTEMPTING TO EXPLAIN IT IN STEPS WITH THE STEPS ALREADY HAVING BEEN DONE*
First I laid out my camera/lens and started measuring and gluing for the bottom/base pad. This is what the camera would sit on in the bottom of the bag.
The first step was cutting a hole in the bottom according to where the tripod foot would seat.
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Then, I stood camera/lens on the tripod foot.
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I then built up using the foam the exact shape of the camera/lens, allowing it to be fully supported along it's whole bottom side.
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It wasn't going to fit in the bag unless I cut out a hole for the end of the lens/filter. (Due to having to cut out the hole I in turn padded the inside of the side pocket that the lens would be facing.)
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Here is the lens sitting on it's 'pad'. The front has the 77mm hole cut out and the bottom has the shape of the tripod foot cut out.
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I also wanted to protect the top, as well as give myself a little space for another lens or other misc items. I did the same for the top as the bottom, trying to judge the shape and making a piece to fit the shape.
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I cut two pieces for the front/back of the bag. These I didn't glue in but they fit very snuggly. Here is what the foam looks like with the camera inside.
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