I'm guessing a telephoto lens- do you notice the "pin cushion" distortion?
The vertical lines are curving inwards. This is such a common lens problem
that Photoshop (and other programs) have a tool to fix it.
Does anyone know who the original photographer was?
Those who believe that if you have a Nikon you must use a Nikon lens or if you have a Canon you must use a Canon lens
must have their heads buried in the sand!
All you have to do is go to a website such as www.dxomark.com to see hundreds of examples of "3rd party" lenses made by
companies such as Tamron and Sigma that score higher than lenses made by Nikon or Canon.
When I buy a lens, I'm looking for the best quality, not the name printed on it.
Nowadays, that will quite often be a 3rd party manufacturer.
With digital, I have only two bodies.
When I used to shoot film weddings, I always had three medium format bodies-
one loaded with B&W film, one loaded with a low ISO colour film, and one loaded with a high ISO colour film.
Dxomark gives the Nikon D5300 a score of 83 and it is number 45 on their list of 336 tested cameras.
That is respectable!
I never use teleconverters with zoom lenses; only with prime lenses.
Zoom lenses have more inherent problems than most primes.
A 1.4 x teleconverter makes all of those problems 1.4 times as bad.
The older Canon 100-400 was given a score of 19 (more or less out of 50) by www.dxomark.com.
The newer Canon 100-400 was given a score of 26 (more or less out of 50), which is actually
not bad for a zoom lens.
When you use it with the teleconverter, the quality will decrease.
When I was there, I found the best shooting was when the sun was low in the sky- early morning, or late afternoon.
Around noon, when the sun was high, and shadows were small, I didn't shoot much.
The 3000 series cameras can bracket ZERO shots; 5000 series cameras can bracket 3 shots; 7000 series cameras can bracket 5 shots, etc.
As others have said, if you are working as a professional you MUST have back-up equipment!
Anything mechanical or electrical will eventually break.
"Murphy's Law" says it will break at the most inconvenient time- such as in the middle of a wedding.
This has happened to me a number of times over the years.
It is difficult to tell a bride and groom, in the middle of their wedding, that you are going home
because your one camera is broke. I never had to do this, because I ALWAYS carried spare equipment.
So what did you intend to spell? I'm still confused.
"Asteral effect"
What is that? I googled it, but only found "astral effect".
I have to disagree with you Jeep Daddy. Many "3rd party" lenses are better quality than "name brand" lenses.
Usually, they are also less expensive.
Dxomark gives the Sigma 85 mm f 1.4 lens the highest rating they've ever given any lens.
Fascinating- thanks for sharing!