I appreciate the efforts of all in helping me to Understand the number of stops. Now I just have to determine how many coatings and types. filter elements, and blades should be in each lens lol.

Ty

Big #/little# squared/2 Is this the simple form

Absolutely you can't argue with simple mathematics and physics thank you numbers don't lie that's all I need to know, So just a little over one stop from 1.2 and the 1.8 So one stop of Shutter or one stop of aperture thank you

I have been thinking about shooting Models and possibly nudes as of late, and thought I would look into this topic and section here on the hog. What I discovered for my self anyway was the following.
1) Maybe I am getting to old but the 3 pages I looked at did little for me and I do not mean in that way. just nothing artistic for me, a few but not many.
2) That all of the photos were of Woman.
3) That all but maybe a few were taken by men, I only say that because of the little thumbnail pictures or whatever they are called of the posters.
4) That all? (most)? respondents were men of my age or older I am 62.
Is this a mens only venue? or is it only men who have an interest in nudes? (Seems to be Primarily young woman aswell).
These are not meant to be judgments or criticisms, just an observation, and my curiosity. I would love to hear from any and all, on any of the aforementioned post, Both Men and Woman.

This is in response to both Richard and r.marlaz
Not that the quantity of photos makes you a better the Photographer necessarily or shows your lack of interest etc. But I have in excess of 160000 clicks, And some if not many might say if I have that many an I haven't figured it out by now maybe I'm not too bright or good. And that may be an accurate statement, matter of opinion as well. But that being said this is a Completely new style of photography for me. And as mentioned by each of you some use auto focus some use manual. I have read articles where some street photographers will set up a particular focal length in anticipation of the subject entering that focal length so as not to be too obvious when taking the photo. That being said that is what I meant by shoot away as you would have to pull the trigger or put it on continuous for the 2 or 3' in which they would be entering or exodian in hopes of getting the perfect shot. As opposed to having a very fast auto focus to catch just the one shot at any given focal length.

That I understand about the trails that's why I was wondering if a 1.2 is that much faster than say a 1.8 to reduce the time the shutter is open. Is the difference between a 1.8 and a 1.2, 1 stop, 2 stops, half a stop, 3rd stop. This I don't know as well.

No I'm not that new, And like so many here why don't you ask the op what he meant and not make assumtions. Jf you had looked at my thread you would see that I distinctly pointed out 1.21.4 and 1.8 I'm well aware that an F1.2 is far different from that of AF4, And Had you read the entire thread you would note that my questions were always around low light situations which I'm aware F4 is not nearly good enough for low light and potential handheld low light situations. That being said if there is very little difference between an F1.8 and an F1.2 what would that equate to in stops. A 1/2 a stop a 1/3 of a stop?

I presently own a Nikon D500 and will eventually upgrade to a FF Nikon. My questions are as follows
I am looking to purchase a 1.2/1.4 or 1.8 lens as I would like to do more night/ long exposure and street photography with some indoor venues aswell. I have read a lot and looked a various lenses makes and models aswell as various coatings, blades, and focal lengths. Manual focus/auto focus. I understand that many street photographers will set their camera at a particular focal length shoot away and hope for the best. is this the case, or would you prefer to have a lens with auto focus to accommodate various focal lengths I am curious as to what specs most of you street photographers use and or prefer.
I want to thank you in advance for your time and effort in this matter.

I presently own a Nikon D500 and will eventually upgrade to a FF Nikon. My questions are as follows
I am looking to purchase a !.2/1.4 or 1.8 lens as I would like to do more night/ long exposure and street photography with some indoor venues aswell. I have read a lot and looked a various lenses makes and models aswell as various coatings, blades, and focal lengths. Manual focus/auto focus. I would imagine with astrophograpy you would set you focal length at Infinity most if not all of the time? I am curious as to what specs most of you astro photographers use and or prefer.
I want to thank you in advance for your time and effort in this matter.

As I will be using this lens primarily for low light and night Photography, will I need the lens with the higher number of blades and the various coatings on the lens.

Also of the tamron Sigma, nikon, which bran would you choose, stick with the native Nikon or branch out to one of the third party lenses. As there seems to be dramatic price differences in brands etc.

I'm curious as the op. I will use this land for astrophotography and street photography. At this time I have AD 500 but will eventually go full frame. When I shoot astrophotography I think manual would be fine because I could set it at infinity. But for street photography curious as to the opinions of those who do it would auto focus be good, And/or better than manual. The reason I ask is that I understand a lot of street photographers set their Lens at a particular focal length in anticipation of their subject and shoot away. Obviously auto focus and full frame lenses cost more. My other question is would you buy a 50 mm a 35 mm or something wider. I'm trying to keep the cost under a 1000
I would also occasionly use this lens inside buildings museums etc.

I want to thank all of you for your responses I will look into the 1.4 or 1.8
I just get lazy sometimes and hate setting up a tripod and want the fastest low light lens I can get To shoot hand held. but maybe I should just set up a tripod and save the money.

Ty