Query Re Lens SIzes

Archived from groups: rec.photo.digital (More info?)

Hi

Im looking to buy a Canon 350D but I have no idea as to what the lens
sizes mean and what zoom range they relate to.

For example, one of the lenses that comes with the 350D is 18-55mm and
there is also a 55-200mm.

In terms of the zoom range, how do I work it out?

If I wanted 12x optical zoom, what lens size would that require?

Thanks for any help.

Archived from groups: rec.photo.digital (More info?)

"Jim" <j.n@nospam.com> wrote in message
news:wV%xe.630$Ae.417@newssvr12.news.prodigy.com...
>
> "BF" <barry@bf111.plus.com> wrote in message
> news:n7rgc1915eveak7454daaf5q1larh0d7ou@4ax.com...
>> Hi
>>
>> Im looking to buy a Canon 350D but I have no idea as to what the lens
>> sizes mean and what zoom range they relate to.
>>
>> For example, one of the lenses that comes with the 350D is 18-55mm and
>> there is also a 55-200mm.
>>
>> In terms of the zoom range, how do I work it out?
>>
>> If I wanted 12x optical zoom, what lens size would that require?
>>
>> Thanks for any help.
> 18-55 means that the zoom range of the lens is from 18mm to 55mm.
> 55-200 means that the zoom range of the lens is from 55mm to 200mm
> As for the second question, first determine what you want the minimum
> focal
> length to be.
> Then multiply that value by 12. The result is the longest focal length.
> You won't find many 12x zoom lenses for the 350D.
> Jim
>
The only item that seems to be marked correctly are binoculars 7x50 means
just that 7 power 50mm objective lens. Every day I have to convince people
that a 12X zoom on a Canon S2 or Panasonic FZ5 is not 12 power.

Archived from groups: rec.photo.digital (More info?)

"BF" <barry@bf111.plus.com> wrote in message
>news:n7rgc1915eveak7454daaf5q1larh0d7ou@4ax.com...
> Hi
>
> Im looking to buy a Canon 350D but I have no idea as to what the lens
> sizes mean and what zoom range they relate to.
>
> For example, one of the lenses that comes with the 350D is 18-55mm and
> there is also a 55-200mm.
>
>>> In terms of the zoom range, how do I work it out?

Something like a Tamron 18~200 is close at 11.11x. I feel the lenses should
be marked as a ratio like 12:1 instead of 12x. If we had a lens marked as 6X
zoom that can be a 35~210, but then a 28~168mm or a 50~300mm would all be 6X
(6:1 ratios)

Getting back to the Tamron 18~200mm with a 11.11X zoom that will give an 4X
image magnification...