Arrida wrote in post #16601832
Hello to everyone,
i really need to get 35 mm focal for my Canon 5d Mark II and there is 2 options.
Canon 35 1.4L and Sigma 35mm f/1.4 . I been researching internet for past month and everyone seems to be raving about image quality and sharpness of this lens, BUT also
almost every second reviewer has complained about:
1.
Bad copy , has to choose from many at store directly or to send back to retailer after for another copy2.
Problems with front/back focus.ALMOST every single one has some complains about this topics.
The biggest thing which bothers me -
HOW RELIABLE this lens will be in long term? I use L glass and im pretty shue it will not let me down, but i complitely lost my believe in Sigma after reading this reviews. If i pay 900USD - i want to get decent working product! I dont want to resend them back, or i dont want to send them for microadjustment and also i dont want to invest extra for some dock stations and spend my time on micro adjustments.

Is there anyone here who has this lens for long period - can you confirm that lens performs without any problems? Cuz, i really want to buy this lens! There is no Sigma service in my country and i dont want to get in situation where after couple month of usage i will have to send it with my camera somewere abroad for adjustments.
In my opinion PRO level lenses should be reliable, PAY and GO!
Hey. I fully understand your concern and who wouldn't be concerned as $900 is lot of money. Just few things: Sigma's bad reputation on these forums is largely based on some older lenses with less-than-stellar autofocus performance, such as the old 30mm f/1.4 and the older Sigmalux 50/1.4. However, with the introduction of Art-series Sigma has demonstrated that they are more than capable to equal (or surpass in this case) the quality of the L-lenses. Also understand some things get blown out of proportions, such as Sigma and amount of autofocus problems. It's just the way internet forums seem to work. Based on my experience the Sigma 35/1.4 is more than reliable autofocus performer. Yes, I did purchased the USB-dock as it helped me to update the firmware on the lens (I do recommend updating the firmware). And it helped me to fine-tune the microfocus adjustment, since the in body options regarding microfocus adjustment is extremely limited on 5D mark II.
So what I am trying to say is you are just as likely to get a Canon L-lens which requires microfocus adjustment in your body. Especially on your body as 5D II has kinda obsolite autofocus performance. I have the same body but most of the time I find myself using only the center autofocus point as it's by far the most reliable one. If you update your body one day (5D III or 6D) the situation will improve. Also understand that microfocus adjustment is combination of body and lens. The purpose of the USB-dock is it saves you lot of time and effort when you actually can do the adjustment yourself instead of sending it for fine-tuning. Which always takes lot of time and effort. In my opinion it would be just as beneficial for Canon to release such a device. Although my guess is future Canon bodies will also have a variable distance microfocus adjustment in-body, as they just released a patent covering such capabilities.
So with the Sigma 35 you will get:
- optically the best performing 35mm f/1.4 lens on the market
- a good investment for $900
- longer warranty than with Canon (3-5 years depending when you live?)
- the 35L is still ~400-500$ more expensive than the Sigma, so it will save you some money
- Sigma 35 won't lock focus as fast in extremely pitch black light as 35L but we are talking about very tiny differences. 35L also happens to be one of the fastest lenses to autofocus, but by comparison the Sigma certainly is no slouch either
- The rumoured 35L II is said to be released this year. It can drive the price of 35L mk. I much lower. I'd expect 35L II price to be far greater than 2000$, though...
However, nobody can tell you for sure if you will have to do some microfocus adjustments as whole phase detection autofocus is not as accurate as contrast based autofocus is. You will know this until you get the lens and test it. But what I can guarantee you is that it's very easy to do. I suggest googling Magic Lantern + Dot Tune method. It's available on your body and you can do the adjustment in approximately 10 minutes. Very easy. And obviously the odds are that you don't have to even do this as most lenses work just fine out of the box. It's just the internet myths spreading so rapidly when people seem to think all their lenses are faulty. Also I'd like to remind you that Canon's latest 35mm lens, Canon EF 35 f/2 IS USM, is d@mn fine lens and has IS. It's also a little cheaper. However it can't do f/1.4 
Good luck in your decision 