I was thinking to sell that I’ve used Sony SLT-a55/Tamron 28-75 f2.8 over 5 years and buy a used Nex-7 (The body price is around $300). At the moment, I found a cheap used nex-7 + 2 lenses set and could buy it.
I have 4 lenses temporarily and all lenses have 30mm focus length. Then I compared them.
- Sigma 30 f2.8 (Fixed)
- Sony SEL1855/f3.5-5.6 (Manual zoom)
- SELP1650/f3.5-5.6 (Power zoom)
- SEL30M35/f3.5 (Macro)
Focus length: 30mm
F number: 5.0
Publishing: Raw files are resized and converted to jpg by Lightroom
Perhaps, I can’t find any difference. Still I feel that a edge is not sharp on SELP1650 picture. But It may blur because the hook ring is a little unfocused.
I cropped all pictures. Still I feel that SELP1650 picture is not sharp.
This time, I set each F number to max on each lens. Sigma shows a nice boke as f2.8, and color is very clear. I can see a stereoscopic object on SEL1855.
I cropped all pictures. After all, SELP1650 picture is not sharp on a edge. Sigma is mild.
Sigma has a nice boke and a mild, though, I don’t want to bring it as an extra lens. I wonder how much different of Sonnar T. Eventually, this is the best way that I through out APS-C and get A7 series + an expensive lens.
And I was worrying about a zoom speed of sigma, it’s a little slower than sony’s lenses. And I can’t close to a object. (minimum 30cm/11.8in). Surely, it doesn’t need to close a object if I use 30mm lens. Sony lens minimum distance is 25cm/9.84in.
Which should I buy from them? If you want have a power zoom, you can buy SELP1650. If you don’t care a manual zoom and common lens, you can buy SEL1855. You don’t need zoom but want to use macro sometime, you can 30M35. I may buy 30M35 if I want have a fixed 30mm. I want to close to a object sometime.
Right now, I need a wide lens. I think it’s enough only having SEL1855 and I’ll sell the others according to my first plan.
Regarding Nex-7, it has quit enough dials and buttons. I think that it become an alternatively of DSLR. I don’t need a big camera any more. It has DSLR handleability and turning performance, I can bring it anytime anywhere, and take a lot of pictures. This upgrade was nice upgrade as connection to A7 series.
I uploaded these raw data just in case. Emount4lensesComparison.zip