Advice on Sony Lens

Posted on 2012-08-13
Medium Priority
Last Modified: 2012-08-13

My partner has a Sony A35 camera and I would like to purchase a new lens for her birthday.

She has the stock lens that cam with her A230, some kind of macro zoom lens and a Sony portrait lens.

Prior to using DSLR's she used a Kodak camera that has a 10X super zoom, this is a function she misses quite a bit.

I would like to buy something that will replace the stock lens that offers the same wide angle view + around a 10X zoom.

I understand that things are measured differently in the world of DSLR but to be quite frank I don't understand any of it!

The budget would be around £300.  Are the any lens' around that price that anyone can recommend that would suit my specification?

Many thanks
Question by:admincbf
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LVL 33

Expert Comment

by:Paul Sauvé
ID: 38288809
All variable lenses have magnification - to calculatr the magnification of the lens, divide the longest focal length by the shortest. This is true for all cameras, digital or not.

For example, I use a Canon EF-S 17-85mm IS USM:
Magnification = 85mm/17mm = 5x.

However, since I don't know what model of Kodak camera, it is difficult to day what type of lens you are referring to.

Here is a Tamron 28-300mm f/3.5-6.3 XR Di LD IF Macro Sony-alpha (10.7x) for about £250.

What IS different is that the sensor size is slightly smaller than a 35mm film:Sensor sizesThe Sony SLT-A35 has a APS-C (23.5 x 15.6 mm) sensor.

Author Comment

ID: 38289636

Many thanks for your reply, I understand a bit better now, especially understanding the zoom

I have looked back thru some old photos and found the camera was a Kodak EasyShare DX6490 - you can see the specs here

Will the Tamron you suggested be similar to this lens, or quite different?

Many thanks
LVL 33

Accepted Solution

Paul Sauvé earned 2000 total points
ID: 38289783
The Kodak has a 10X optical zoom, 6.3-63.2 mm (35 mm equivalent: 38-380 mm) and the Tamron, 28-300mm. This means that the image is slighly less "blown up". However, the Sony image can be cropped and enlaged with less loss to quality. The Kodak sensor size is MUCH smaller at 1/2.5". So you should be good to go with the Tamron 28-300mm f/3.5-6.3.

Here is an article on Effects of Focal Length.

Author Closing Comment

ID: 38289824
Thanks very much for your explanations, I feel much more confident in purchasing the right lens
LVL 33

Expert Comment

by:Paul Sauvé
ID: 38290218
Let me just mention (I forgot this) that you should take into consideration the Crop Factor of the cameras.

The Crop Factor is the SQUARE ROOT of the ratio of the area of a 35mm frame to the sensor area:
35mm = 864 mm2;
APS-C Sony = 270mm2;
Kodak EasyShare DX6490 = 25 mm2.
What this signifies is that you multiply the focal length of YOUR camera x the Crop Factor the get the equivalent focal length of a 35mm camera. This allows us to compare digital cameras to a "standard" 35mm SLR camera.

Crop Factor
Sony:   sqrt(864 mm2/270mm2) = 1.5
Kodak: sqrt(864 mm2/25 mm2) = 5.9
Equivalent Focal Length
Sony:   300 mm *  1.52 = 458 mm
Kodak: 63.2 mm * 5.9 = 272 mm
So the Tamron lens has a "greater enlargement", ie. a smaller viewing angle,  when calculated in this manner. The longer the focal length, the smaller the viewing angle...

I know it'a a bit techy, but that is the general idea. I'll be happy to answer any related questions on lenses for the Sony camera.

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