I would suggest renting a converted Nikon camera and making sure the investment is what you will use. Once you have made the decision to have an IR camera available full time, buy a D5600 and have it converted by either Kolari Vision or Lifepixel. Both companies websites offer a ton of information.
Keep your receipt, Nikon lens come with a five year warranty. With the receipt you can still get coverage at Nikon.
This negative was made using a Hasselblad camera. Each Hasselblad film magazine has 2 "V" notches on the side of the negative, represented here at the top of the negative. For it's day it was industry standard if you wanted high quality photos (Assuming your photographer was good at his or her craft).
What was the elephant peacefully protesting?
It's easy to compliment good work!
Both are good, but the 1.4 will have more aperture blades and produce a rounder aperture. Therefore, the background should have a softer feel when you are shooting wide open or even at f/1.8 then when using the f/1.8 lens. If softness is not what you need, may I suggest trying the 60mm Micro lens. It's 2.8, but gets you 1:1 magnification. It can be uses for general photography and extreme close-up photography. One last thing, most all lens produce a sharper image when stopped down two F-stops. I have found the Nikon 60mm/2.8 to be pretty sharp at all F-stops. Depending on your camera, you may have to use one or the other AF or AF-S lens. Good luck!
Rodenstock made the Imagon lens for portraits. I have one for my Nikon cameras and suggest you try it, sharp, but soft.
kolarivision.com or lifepixel.com are trusted sources with good reputations.
Some time ago, I was able to acquire a third Nikon D750 body. It was used, though slightly (under 500 shots) and inexpensive compared tobuying a new one. Even though it would have no factory warranty, parts are still available if needed and I would not have new menus or controls to learn. Buying or converting a camera no longer in production was never considered because I wanted this camera for long term use.
I had it converted to 720nm by Kolari Vision, purchased a Hoodman device to facilitate hand held, manual focus and live view operation. It freely goes between being hand held to being mounted on monopod or tripod. From the day I sent the camera to Kolari Vision until the day I received it back was 14 days.
If you have used Infrared film before, you know what's ahead. But if not and before venturing into uncharted water, borrow or rent a converted camera and use it for the weekend. If you are serious about Infrared photography, you will want your own converted camera. Landscapes will be dramatic as IR punches through haze and portraits beyond belief with pale skin virtually free from defects.
Good luck on your Infrared journey!
Because I almost moved to Tucson in 1987, I'll bite. I'm sure you're better at PayPal transactions then I, send me the link and we'll do some business.