Camera question

[rgregory1965]

I have an Sony A390

I have 2 lenses for it

18-55 that is an f3.5 and a 75-300 that is an f4.5

I cant get my camera to go above f5

what am I doing wrong???

 

[Dao]

I believe you have the
Sony 18-55mm f/3.5-5.6 DT SAM and Sony 75-300mm f/4.5-5.6 SAL

These 2 lenses are zoom lens with variable maximum aperture. When the focal length is set at the shortest (i.e. 18mm in 18-55mm lens or 75mm in 75-300mm lens), the maximum aperture size you can set are f/3.5 and f/4.5 respectively. (lower the f/#, wider the aperture). However, when you zoom to a longer focal length (i.e. 55mm in 18-55mm lens and 300mm in 75-300mm lens), the maximum you are allow to set changed f/5.6 on both lens. You are no longer able to set the aperture wider than f/5.6 (i.e. lower number than 5.6). And it is the lens properties that you cannot change in your camera.

However, if you get this lens : Sony 70-200mm f/2.8 G SAL-70200G, you should be able to set the aperture to f/2.8 (widest aperture the lens can set) from 70mm all the way to 200mm. But lens like that usually cost more.

 

[KmH]

I have an Sony A390

I have 2 lenses for it

18-55 that is an f3.5 and a 75-300 that is an f4.5

I cant get my camera to go above f5

what am I doing wrong???

Not bothering to make the effort to understand what the numbers on your lenses mean.

 

[rgregory1965]

I have an Sony A390

I have 2 lenses for it

18-55 that is an f3.5 and a 75-300 that is an f4.5

I cant get my camera to go above f5

what am I doing wrong???

Not bothering to make the effort to understand what the numbers on your lenses mean.

I guess when it says NOOB in my profile it means nothing to some a-holes.....Its almost a nicer experience to google your questions that ask them here.....too many smart asses with smart ass answers......

Should make two new topics on this forum

NOOBs with real learning questions -and-
Know it all's with douche bag answers

Then we would all know where to post our questions.

 

[rgregory1965]

I believe you have the
Sony 18-55mm f/3.5-5.6 DT SAM and Sony 75-300mm f/4.5-5.6 SAL

These 2 lenses are zoom lens with variable maximum aperture. When the focal length is set at the shortest (i.e. 18mm in 18-55mm lens or 75mm in 75-300mm lens), the maximum aperture size you can set are f/3.5 and f/4.5 respectively. (lower the f/#, wider the aperture). However, when you zoom to a longer focal length (i.e. 55mm in 18-55mm lens and 300mm in 75-300mm lens), the maximum you are allow to set changed f/5.6 on both lens. You are no longer able to set the aperture wider than f/5.6 (i.e. lower number than 5.6). And it is the lens properties that you cannot change in your camera.

However, if you get this lens : Sony 70-200mm f/2.8 G SAL-70200G, you should be able to set the aperture to f/2.8 (widest aperture the lens can set) from 70mm all the way to 200mm. But lens like that usually cost more.


Thanks Dao​

I totally understand that, thank for taking the time to explain it to a NOOB.....