My 500 PF 5.6 lens hood broke. Thankfully it was extended and saved any damage to my lens. However, I looked online and the standard replacement was back ordered and I was going on a trip ! I super glued and duct taped the lens hood and covered in a camo tape to tie me over. Found Zemlin lens hoods with an online search and ordered one. These hoods are amazing and so much easier to put on and off. Material is much better and stronger. I definitely recommend to anyone who finds their current hood a bit of a hassle or needs a replacement. I received it in the mail within 5-7 business days ( living in Alaska, shipping takes longer). The Zemlin hood was $159 compared to $59 for the Nikon version but I have to say that the Nikon version being out of stock was sort of a blessing in disguise. I wanted the new hood before the trip and I like the Zemlin one so much better !