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Cameras, Lenses and Accessories: Discuss Calculating Zoom in X...Hi folks, I am fairly new to the advanced digital cameras and still haven't gotten the hang of all the ...
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Old 27-07-2006, 09:02   #1 (permalink)
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Calculating Zoom in X

Hi folks,

I am fairly new to the advanced digital cameras and still haven't gotten the hang of all the mm's for the lenses...

Is there a way to know the zoom in terms of how many times (x) from the mms on the lenses? Like if it is a 10x or 20x?

Thanks
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Old 27-07-2006, 09:22   #2 (permalink)
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Re: Calculating Zoom in X

Hi sbtm

The simplest method is to divide the longest mm of the zoom, by the widest mm of the zoom. For example the Nikon 18-200mm is 200/18 = 11.1 x zoom range.
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Old 27-07-2006, 09:32   #3 (permalink)
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Re: Calculating Zoom in X

You might find this diagram helps show the difference of mm at the wider end of the lens range. This shows a comparison of what you would capture with each mm range. Note most kit lenses start at 18mm, which is considered wide angle, so anything lower is really only applicable if you wanted to go ultra wide with shots. Hope that helps & don't hesitate to ask anymore questions.

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Old 27-07-2006, 10:23   #4 (permalink)
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Re: Calculating Zoom in X

wow you guys are good :-) Thanks

I guess talking in terms of x zoom isn't professional isn't it? I'll try to get used to the mm's
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Old 27-07-2006, 10:27   #5 (permalink)
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Re: Calculating Zoom in X

Nice house you got there Dave
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Old 27-07-2006, 10:40   #6 (permalink)
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Re: Calculating Zoom in X

Quote:
Originally Posted by sbtm
wow you guys are good :-) Thanks

I guess talking in terms of x zoom isn't professional isn't it? I'll try to get used to the mm's
Nope you can talk of zoom in terms of x as long as its clear, there is nothing wrong with that

Most people tend to talk in terms of mm though when reffering to pictures and lenses as its easy to compare to what they are using without having to calculate the zoom factor for their own equipment...I think we are just lazy
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Old 27-07-2006, 11:25   #7 (permalink)
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Re: Calculating Zoom in X

Quote:
Originally Posted by Steve
its easy to compare to what they are using without having to calculate the zoom factor for their own equipment...I think we are just lazy
which imo is only relevant if everyone talks in 35mm terms (which I doubt most do)

Your, and my, 100mm lens bears no relation to an olympus 100mm lens.

I think yours would be 160mm in 35mm terms, mine would be 150mm and the oly would be 200mm

just to confuse things a little more
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Old 27-07-2006, 12:21   #8 (permalink)
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Re: Calculating Zoom in X

Quote:
Originally Posted by orangepeel
I think yours would be 160mm in 35mm terms, mine would be 150mm and the oly would be 200mm

just to confuse things a little more
Hmmm... no wonder I don't get the hang of all the mm's
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Old 27-07-2006, 12:47   #9 (permalink)
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Re: Calculating Zoom in X

Quote:
Originally Posted by orangepeel
which imo is only relevant if everyone talks in 35mm terms (which I doubt most do)

Your, and my, 100mm lens bears no relation to an olympus 100mm lens.

I think yours would be 160mm in 35mm terms, mine would be 150mm and the oly would be 200mm

just to confuse things a little more
I am sorry but I have to disagree.

A 100mm lens is still a 100mm lens no matter what camera body you put it on. The problem is one of crop factors which many people mix up with true zoom lengths.
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Old 27-07-2006, 13:18   #10 (permalink)
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Re: Calculating Zoom in X

I know the "looks zoomed" explanation is simplistic and technically wrong, but I've not yet seen an understandable explanation of the crop factor and why the same mm looks different on some bodies.

I get that the smaller sensor is cropping the view, but when you look at the same image on 6mp cams with the same mm on different sensor sizes the smaller sensor size looks as though it's zoomed in.

I guess I just don't get this whole thing and why it's wrong to say it "looks zoomed"

I've still not seen an explanation that is readily understandable in the same way that "it looks zoomed" explains it.
I hearby challenge you if u can make this idiot understand then anyone can get it
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Old 27-07-2006, 13:36   #11 (permalink)
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Re: Calculating Zoom in X

Quote:
Originally Posted by orangepeel
I hearby challenge you if u can make this idiot understand then anyone can get it
Why type it all out yourself when someone else has already gone to the trouble

Crop factor/zoom lens explination

Hopefully that will help
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Old 27-07-2006, 14:23   #12 (permalink)
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Re: Calculating Zoom in X

Bookmarked! However it still doesn't explain why "zoomed in more" is wrong.

Even the examples still look as tho it's magnified.

Quote:
OK, firstly, when you put a 300mm lens on a D60 you do NOT get a 480mm lens – it is still a 300mm lens.
Fine, but to get the same fov on a full frame cam you will need a 480mm lens so why not just call it 480mm on the D60?

An example of this would be this image here for the derelict assignment: -
http://www.pixalo.com/gallery/showph...to/965/cat/553

If Foxesbrew was to quote 7.4mm it'd confuse the hell out of all of us... so better to call it in 35mm terms no?


In essence it seems to me to be a pedantic argument - with the exception of the DOF issue which I hadn't considered before
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Old 27-07-2006, 14:43   #13 (permalink)
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Re: Calculating Zoom in X

I suppose that you could say [i]equiverlant 480mm on a 1.6x crop[i] and be allowed to get away with it but no matter what you say a 300mm lens will always be a 300mm lens in reality.

I fully understand your argument though and agree that it is very confusing, even experianced photographers still don't understand the fov/crop factor arguments. What chance has the beginner got
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Old 27-07-2006, 15:42   #14 (permalink)
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Re: Calculating Zoom in X

I've sussed it. We should all imagine we are 10 feet away from a bar that has pints lined up. We then only talk in terms of pints in view. A wide angle 10mm now holds 50 pints.... the 50mm holds 10 pints & the 200mm is down to 2 pints. Easy peasy
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Old 27-07-2006, 15:49   #15 (permalink)
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Re: Calculating Zoom in X

Genius
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Old 27-07-2006, 16:20   #16 (permalink)
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Re: Calculating Zoom in X

Off to patent it now. You'll need to amend your WTD Ad sonsey to ...after the Canon 50-30 pinter, or maybe the Canon 35-18 pinter L
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Old 27-07-2006, 16:58   #17 (permalink)
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Re: Calculating Zoom in X

Quote:
Originally Posted by Steve
I suppose that you could say [i]equiverlant 480mm on a 1.6x crop[i] and be allowed to get away with it but no matter what you say a 300mm lens will always be a 300mm lens in reality.

I fully understand your argument though and agree that it is very confusing, even experianced photographers still don't understand the fov/crop factor arguments. What chance has the beginner got
when I started with my photography I asked rossco (rsphoto) about all this as I was baffled. Whenever I speak to him about focal lengths he quotes in 35mm terms. At first I grumbled a bit about this but in truth it's the only way we can all be singing from the same hymn sheet. This is especially true in a multi-format forum like this.

The problem of course is everyone has to mentally convert for their crop factor. Best bet may be to have a list of camera models with the accompanying crop factor then we like myself can look it up as required

Quote:
Originally Posted by Dave
I've sussed it. We then only talk in terms of pints in view. A wide angle 10mm now holds 50 pints....
lol
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Old 27-07-2006, 17:13   #18 (permalink)
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Re: Calculating Zoom in X

Quote:
Originally Posted by Dave
Off to patent it now. You'll need to amend your WTD Ad sonsey to ...after the Canon 50-30 pinter, or maybe the Canon 35-18 pinter L
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Old 27-07-2006, 17:13   #19 (permalink)
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Re: Calculating Zoom in X

Quote:
Originally Posted by orangepeel
The problem of course is everyone has to mentally convert for their crop factor. Best bet may be to have a list of camera models with the accompanying crop factor then we like myself can look it up as required
You mean just like This ??

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Old 27-07-2006, 18:05   #20 (permalink)
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Re: Calculating Zoom in X

sort of, but I for one have no idea what camera a 1.3x crop applies to. Might be better to have the models with the crop factor for each...

Nikon D50 - 1.5
Nikon D70 - 1.5
...
Olympus E1 - 2



etc...

those are the only ones I know
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Old 27-07-2006, 18:29   #21 (permalink)
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Re: Calculating Zoom in X

Some people are never happy
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Old 27-07-2006, 19:51   #22 (permalink)
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Re: Calculating Zoom in X

Well given that this is me with a happy look...

Turning Grumpy Into An Artform


you could say that's an understatement
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Old 28-07-2006, 10:00   #23 (permalink)
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Re: Calculating Zoom in X

We are working on a few things behind the scenes that is keeping us busy currently but I will update and improve the crop factor article to include 1.5x crop and a comprehensive list which cameras have what crop factor. Don't expect it tomorrow though

EDIT. I have just looked at your picture from the link... I wouldn't like to bump into you on a dark night
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