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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 17 Sep 2012 (Monday) 13:11
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New Sigma 35mm f/1.4 HSM DG

 
Sirrith
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Jul 20, 2013 01:38 |  #3211

Wow, +100MA? :lol:


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Jul 20, 2013 02:19 |  #3212

+109 ;)


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Jul 20, 2013 03:01 as a reply to  @ xpfloyd's post |  #3213

What with all the AF issue talk on this thread I have posted some photos and discussed the sporadic AF issue on another thread. Take a look if you are still undecided.....as I am !!

https://photography-on-the.net …/showthread.php​?t=1316462

I think that I will order the dock today on Amazon.


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Jul 20, 2013 06:23 |  #3214

Just dot tuned there for the first time.

At 50x focal length and closer +4
At 100x focal length -8

It seems I can get my lens set up at +4 for everything close and its poor at distance or vice versa. Maybe I do need to purchase the dock then to allow a different setting at infinty and up closer.


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Jul 20, 2013 22:51 |  #3215

Yes that does seem excessive.


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Jul 21, 2013 02:32 |  #3216

vertigo235 wrote in post #16138854 (external link)
Yes that does seem excessive.

What is this referring to?

That's me ordered the dock, should be here Wednesday


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Jul 22, 2013 18:25 |  #3217

How do people find this lens at distance and wide open? I used my mate as a test today and took the same picture of him wide open, one about two feet away, 4ft, 6ft and one further...oh and did them outside with a tripod, centre focus point. The 1st 3 are good, the distance one isn't. I do have the dock but am struggling with anything further away. But when I've messed about taking pics of cereal boxes and test charts even using 10x live view I can't get it much sharper, is this just the limit of 35mm wide open? If I look on flickr or pixel peeper at images other people have made with this lens wide open they seem a way back and it's sharp.
I'm really not a focus chart / wall photographer but I'm just trying to suss out is it me (most likely) or the lens or am I just expecting to much from it? It's Ma settings. Best as I can get them are +3 +4 +3 0. Anything up to about 4ft from subject is really sharp.


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Jul 22, 2013 20:32 |  #3218

After going back and forth between the S35 and 35L I decided to give this lens a try. Only concern is possibly getting a lens with focus issues. I bought the lens used so I have no way of exchanging. Fingers crossed.


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Jul 22, 2013 20:54 |  #3219

worst case senario is you drop another $59 for the dock and adjust your lens yourself. Or borrow the dock from someone...


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Jul 22, 2013 21:20 |  #3220

gnome chompski wrote in post #16144772 (external link)
worst case senario is you drop another $59 for the dock and adjust your lens yourself. Or borrow the dock from someone...

How does one actually use the dock? Would I need other tools to figure out what MA needs to used?


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x0ny
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Jul 22, 2013 22:06 |  #3221

A focal chart. Theres a user that provides a free print out to build your own. Then a tripod and optional remote shutter. Then its just time and patience.


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gnome ­ chompski
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Jul 22, 2013 22:25 |  #3222

itsmejson wrote in post #16144847 (external link)
How does one actually use the dock? Would I need other tools to figure out what MA needs to used?

in a nutshell, you set up a stationary target, such as a cerial box or a focal chart on a wall. Then set your camera on a tripod and take pics at various distances. i did 1, 1.5, 2, and 6 feet away from the chart (based on another forum members recommendation). Pixel peep these photo's on your computer and adjust accordingly. Im sure there are better ways, such as the dot tune method, but I did this way. You then attach the lens to the dock, after you have DL'd the software from Sigma and set the focal adjustments. Its pretty easy all said and done. Mine only needs like a +2 or 3 through all 4 ranges after the new update, although the 6' - Infinity is a bit wonky. Although, realistically one would stop down for those shots so Im sure its fine. I just havent checked yet


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x0ny
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Jul 22, 2013 22:49 |  #3223

yea my 6 to inf is still weird but definitely wont be shooting wide open that far away so no need to worry.


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xpfloyd
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Jul 23, 2013 02:43 |  #3224

itsmejson wrote in post #16144847 (external link)
How does one actually use the dock? Would I need other tools to figure out what MA needs to used?

The methods above for MA (taking photos then pixel peeping) do work (thats how I used to do it) but I find the dottune method easier and more accurate.

Basically you -

1 - set camera on a tripod and level (hot shoe bubble works well)
2 - set up a target 50x the focal length away (If using the dock use the 4 distances that the dock states instead)
3 - Ensure the target is square to the sensor
4 - got to live view 10x and focus target either manually or automatically
5 - switch lens to manual focus taking care not to turn focus ring
6 - exit live view
7 - using a remote shutter release increase the MA value by 1 each time and check for focus confirmation (red square + beep) using remote shutter release. If you get good confirmation increase the MA value and try again.
8 - When you stop getting the confirmation or when there is a slight delay in the confirmation that is you at the limit so note down the value.
9 - Repeat the process in the other direction (decreasing the MA value each time)
10 - That will give you 2 values of MA showing the range. You then calculate the median and this is your MA value. For example if your range was -2 to +12 you would set the MA value to +5

If using the dock you do this for each of the 4 distances and then input your calculated MA values into the software. Your camera is then set to 0MA.

That might sound a bit long winded but its actually very quick and easy to do and I have found it to be very accurate


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xpfloyd
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Jul 23, 2013 02:51 |  #3225

spookyspike wrote in post #16144396 (external link)
How do people find this lens at distance and wide open? I used my mate as a test today and took the same picture of him wide open, one about two feet away, 4ft, 6ft and one further...oh and did them outside with a tripod, centre focus point. The 1st 3 are good, the distance one isn't. I do have the dock but am struggling with anything further away. But when I've messed about taking pics of cereal boxes and test charts even using 10x live view I can't get it much sharper, is this just the limit of 35mm wide open? If I look on flickr or pixel peeper at images other people have made with this lens wide open they seem a way back and it's sharp.
I'm really not a focus chart / wall photographer but I'm just trying to suss out is it me (most likely) or the lens or am I just expecting to much from it? It's Ma settings. Best as I can get them are +3 +4 +3 0. Anything up to about 4ft from subject is really sharp.

Is this after using the dock you still find distances out? My dock hasnt arrived yet


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