Lens choice for a particular angle of view

[GPS]

Correct trig if you used 6x6 cm for size. Medium format film is 56mm on a side, yielding a 58.498 degree angle of view (horizontal or vertical) with a 50mm focal length.

If there are any doubts still with all the various answers, here's a really handy website, but too bad it doesn't do LF.

http://www.sweeting.org/mark/lenses/medium_format.php

Unfortunately, you're not as correct as you think you're...
Different medium camera types have different actual film frame size. Thus one camera can indeed have 56mm film gate while the other has 57mm. The differences are even bigger on the horizontal side. The OP didn't specify the actual film gate size on his Hasselblad, hence...
The same is valid for LF. Therefore when citing view angles the nominal film sizes are usually taken for calculations unless one is interested in the actual values and takes the precise actual film gate values for it.

[John NYC]

Unfortunately, you're not as correct as you think you're...
Different medium camera types have different actual film frame size. Thus one camera can indeed have 56mm film gate while the other has 57mm. The differences are even bigger on the horizontal side. The OP didn't specify the actual film gate size on his Hasselblad, hence...
The same is valid for LF. Therefore when citing view angles the nominal film sizes are usually taken for calculations unless one is interested in the actual values and takes the precise actual film gate values for it.

Which is why I said your answer is correct if you use 6x6cm. That is, you are using the same math I am.

The website I showed uses 56mm on a side also, and that is what I've usually seen quoted as the typical actual size.

[John NYC]

While I was jumping around in settings in pCAM software, somehow I got the camera to subject distance down to 0.297m

Not sure I'm following you.

[Gordon Moat]

Not sure I'm following you.

Angle of view changes slightly with focus distance. If you only did calculations at or near infinity focus, then the numbers might be more consistent. Anyway, I only used pCAM to come close to the lenses that might match the needs of the OP, and then wrote about which choices might be easily available.

[John NYC]

Angle of view changes slightly with focus distance.

Ah, didn't realize that.