Sony A1 28-60 mm lens effective magnification query

The minimum focusing distance of the 28-60 mm lens is 30cm at 28mm and 45cm at 60mm.

Two scenarios:

a) focus on a subject at 30cm distance with the lens at 28mm

b) focus on the same subject at 45cm but with the lens at 60mm

What is the effective magnification of b over a?

Thanks

This review gives some indication, scroll down to the section on focusing and it provides frame coverage in mm, at 28mm it is  (267 x 178mm) filling the frame of a full-frame camera and at 60mm, an 8.7 x 5.8" (221 x 147mm) object fills the frame.

https://www.the-digital-picture.com/Reviews/Sony-FE-28-60mm-f-4-5.6-Lens.aspx

This is a series of shots with the 28-60mm: 

The images 5 and 6 are taken with the lens a minimum focus at 28mm and 60mm respectively. At 60mm you get more subject magnification, but probably not as much as you would expect because of the more distance minimum focus. 

Just for interest 7 is the same coral shot with the same lens + CMC. And 2 & 3 are with the same lens + WWL.

I've deleted these original images now. So sorry I can only share in this format. 

Here is a crop of the same screen shot - showing the two images a little larger.

5 hours ago, WK's Gone Diving said:

The minimum focusing distance of the 28-60 mm lens is 30cm at 28mm and 45cm at 60mm.

Two scenarios:

a) focus on a subject at 30cm distance with the lens at 28mm

b) focus on the same subject at 45cm but with the lens at 60mm

What is the effective magnification of b over a?

 

Thanks

If you are thinking to a flat port this is around 1.4x more for case two

However lens real focal length changes with distance so you will find 28mm is wider than it should be and 60mm is shorter than you would expect

Using the lens underwater without any form of correction is not ideal. The working distance becomes 40cm

However with the WWL-1 the lens keeps focussing pretty much on the glass two examples for you

The first shot is uncropped and the second is 1:1 aspect but not cropped

This is the 100% of shot 2 at 60mm

Because the focal length and magnification is increasing depth of field is dropping. The shot is at f/11 but the background is soft this was intentional on this shot but some people like to have all sharp so take into account you are looking at f/22 and smaller for close up if you wanted all to be sharp

On 5/26/2023 at 2:05 PM, Alex_Mustard said:

This is a series of shots with the 28-60mm: 

The images 5 and 6 are taken with the lens a minimum focus at 28mm and 60mm respectively. At 60mm you get more subject magnification, but probably not as much as you would expect because of the more distance minimum focus. 

Just for interest 7 is the same coral shot with the same lens + CMC. And 2 & 3 are with the same lens + WWL.

I've deleted these original images now. So sorry I can only share in this format. 

Many thanks. The photos are indeed useful.

On 5/26/2023 at 3:44 PM, Interceptor121 said:

If you are thinking to a flat port this is around 1.4x more for case two

However lens real focal length changes with distance so you will find 28mm is wider than it should be and 60mm is shorter than you would expect

Using the lens underwater without any form of correction is not ideal. The working distance becomes 40cm

However with the WWL-1 the lens keeps focussing pretty much on the glass two examples for you

 

The first shot is uncropped and the second is 1:1 aspect but not cropped

This is the 100% of shot 2 at 60mm

Because the focal length and magnification is increasing depth of field is dropping. The shot is at f/11 but the background is soft this was intentional on this shot but some people like to have all sharp so take into account you are looking at f/22 and smaller for close up if you wanted all to be sharp

 

 

Yes. I'm using f/22 for macro. Thanks