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Message: <blockquote data-quote="STM" data-source="post: 125681" data-attributes="member: 12827">I have a rectangular one (box shaped actually) which slides into the notches around the front of my Sunpak 544's, similar to the Amazon one in the photo below, and it allows me to fill the frame evenly with light down to a 20mm lens on FX. It actually almost covers a full frame 16mm fisheye lens! You lose roughly a stop using it, but it also softens the light considerably too. If you can find one for your popup flash then by all means it would be a worthwhile investment. But as has already been said, pop up flash are very anemic when it comes to power, a separate flash is a much better bet. <img src="https://s3.amazonaws.com/usm-studio/blottophotto/photos/sunpak_544_blotto_3169_2_large.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>