The "must have" for photography

I recommend it because it can avoid losing your lens cap,

Indeed, if you have an SLR and one goal, just to have a simple link (strap type) binding the lens cap and the strap of the camera / camera. (Because the objective will remain fixed to the casing)
Now, if you have multiple goals, you need to lose that precious cache, plug door is perfect because it allows easy switcher your goals without losing your cap!

I confirm the comptatibilité with Tamron 70-300mm 62mm diameter.

I recommend, especially at this price, it costs less than ordering a new plug!