First thoughts - Sigma 35mm 1.4 Art

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A tail of two halves....

I bought one of these a week ago, after asking for advise on here. It arrived quickly as usual, from Panamoz, just in time for a family weekend in Chester. I considered this to be the ideal chance to give the lens a run out. We would be going to the zoo, among other things and I was hoping to have a good play with the lens. Knowing it was a zoo, I needed more length, so I took my 70-200 along and my 7d mk2. I didn't mind that effectively the lens would become a 50mm, I just wanted to give it a good test.

The weather in Chester was a bit changeable, but mostly dull. I was therefore shooting at around ISO 400 all day to ensure I kept the shutter speed high enough. Normally over and above 1/400th. Often much higher. At the first glance I was not overwhelmed by the results either on the camera, or on the computer when I got home yesterday. I was a little disappointed. I was expecting amazing detail and clarity on the pictures I took of the kids, but I just didn't seem to be getting it. I thought I would be seeing 70-200 F2.8 II / 135mm F2.0 results and I wasn't.

Now, before I went I had my first go at Micro adjustment and didn't find it overly easy. However having said that the 35mm appeared to be about ok on all my cameras, so I left it well alone. My eyesight isn't the best and I sometimes found it hard to discern between one line and another. I didn't think I was far out though.

Now yesterday afternoon I went for a quick walk and decided to take the 35mm, but this time on my 5d mk3. Oh my word, what a difference !!! Even on the back of the camera I could see the clarity and ability of the lens. Admittedly, I was able to shoot at ISO200, but even so, I could see how good the images were. Then when I got home I talked my wife in to allowing me to take 2 quick images of her in the garden. She hates having her picture taken, so I had to be quick lol. ISO200, F2.5 and 1/250th, and the image was absolutely cock on. This was exactly what I was expecting from it.

So.......I am going to have another look at adjusting the lens to the 7d2 and give it another go. It might have been my eyesight that was out, or that it's simply the noise of the 7d2 that I don't like. But if I can't get it better, I will just have to accept that the 7d mk2 just isn't the camera for me, when using that lens at anything other than lovely clear blue sky'd days.

My test time required.
 
I will just have to accept that the 7d mk2 just isn't the camera for me

Spoken with a dark and spooky voice:

—"Maybe you will join us on the dark side…!" Nikon that is!
 
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think it is ment to be 4000 or 6400 ... 400 is fine on 7d2
 
You will always get a noticeably sharper image on full-frame vs APS-C, but my guess is the main difference was the light/weather ;)
 
When you say that you had a play with micro adjust, did you change the micro adjust settings on the 7D? Just wondering if its possible that you've mis-adjusted it on the 7D?
 
With regards to micro adjustment I checked my 35mm and found it did not need adjustment on the camera, so I left it well alone.

When I talk about ISO, I was indeed talking about 400 rather than 4000. Yes I know 400 is very usable, but when compared to images taken with the 5d3 at ISO250, the 7d2 did not perform anywhere near as well (in my opinion). It may well be that as suggested the main difference was the light / weather. I was merely pointing out then I was not wowed by the lens on the 7d2 in those conditions, but when attached to the 5d3 in reasonably similar conditions, the lens came to life.

I will try it again using both cameras on the same day, in the same light and see how things go.
 
I only have a 5Dc and a 40D, so I cannot comment on your (way) better cameras. But I'd say the 7D2 has to perform wonderfully at ISO 400, and even very good 800 or even a bit more. Or, at least, I hope so. :)
My 40D is fine at 400, not so fine at 800, I have to say.

I think the main difference is the crop sensor against the full frame one. Every lens I have seems the excel when used on the 5D. The 40D is a good old camera, but the 5D (even older) beats it in every way, even focus accuracy, I believe. Just not for speed. ;)
 
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