dmogx
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« on: August 13, 2008, 12:35:45 AM » |
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well as some of you have told me, my sigma is extremely soft.. i'm wanting to send it back to sigma usa to fix, but i need to cover shipping to and from, which won't be cheap after all is said and done. so at the recommendation of pekpek, i did the focus test. these are 100% crops help me decide whether or not i need to send this sucker in.. thanks warning, not 56k friendly. first pic 20mm at f5.6 (the instructions were to put it on the lowest f stop.. but that was it, so i chose to try 10mm and 20mm shots)   at 10mm f5.6   straight line at 20mm f5.6  straight line at 10mm f5.6   |
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Ice-520
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« Reply #1 on: August 13, 2008, 03:48:43 AM » |
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it is front focusing
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derrick
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« Reply #2 on: August 13, 2008, 08:52:27 AM » |
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Big time.
Try with your other lenses though. It could be the AF that is off as well.
I was going to test this on my lenses yesterday as well, but didn't have time.
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« Reply #3 on: August 13, 2008, 08:54:47 AM » |
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Yeah, front focusing, most noticeable at 20mm.
Kev
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Current: '09 STI Sport Tech - intake, TBE, AP, spacers and mudflaps
Gone: '08 GTI DSG - stock - meh
Gone: '07 MS3 - FMIC, AP, TBE, coils, RPF1's, lots of stickers - 150k of memories
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dmogx
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« Reply #4 on: August 13, 2008, 09:02:33 AM » |
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hmmm with front focus it probably is enough reason to send it in i guess.
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dL
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« Reply #5 on: August 13, 2008, 09:06:24 AM » |
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Front focusing affects softness? I'm gonna take a bunch of shots next week in Banff with the Sigma and see if it's too soft to my expectations. If so, then I'll try this test as well. If you're sending it back Dan, lemme know how it goes and the experience  You can be the guinea pig.  dL |
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dL
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« Reply #6 on: August 13, 2008, 09:12:33 AM » |
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Now that I observed your test more, your camera seems to be tilted. I'm not sure if that would affect the test. Also, how are you certain you placed your camera at an angle of 45 degrees? Wouldn't those factors affect the test results?
dL
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derrick
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« Reply #7 on: August 13, 2008, 09:17:30 AM » |
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Front focusing affects softness? I'm gonna take a bunch of shots next week in Banff with the Sigma and see if it's too soft to my expectations. If so, then I'll try this test as well. If you're sending it back Dan, lemme know how it goes and the experience You can be the guinea pig. dL Any significant front or back focusing will make your pictures soft because the area you are trying to focus on isn't actually in focus. Now that I observed your test more, your camera seems to be tilted. I'm not sure if that would affect the test. Also, how are you certain you placed your camera at an angle of 45 degrees? Wouldn't those factors affect the test results?
dL
I am assuming these shots were taken on a tripod? Otherwise any movement will throw the focus off a little bit. |
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dmogx
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« Reply #8 on: August 13, 2008, 09:19:03 AM » |
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ya they were on a tripod.. SHOULD be 45 degrees, of course this is measured with the naked eye, so there is a possibility that it wasn't exactly 45degrees..
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dL
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« Reply #9 on: August 13, 2008, 09:20:59 AM » |
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So are you sending it back Dan? Let me know how it goes!! You probably have to pay for shipping though  dL |
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dmogx
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« Reply #10 on: August 13, 2008, 11:06:35 AM » |
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ya i'm planning on sending it back.. in fact, instead of gentec (heard they were useless), i'm sending it to sigma usa.. they said i would need to cover shipping to and from, which is ok if they can fix it correctly the first time around.
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dL
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« Reply #11 on: August 13, 2008, 11:12:21 AM » |
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Yea Canadian warranties are done thru 3rd party distributors. That applies to Tamron as well.
dL
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dmogx
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« Reply #12 on: August 13, 2008, 11:15:11 AM » |
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ya and since i heard multiple stories of gentec not being able to pinpoint the problem, it may end up with me sending it back to them a few times.. so if i'm going to do it, i rather it is done right the first time.
quick question derek, for your 10-20, does the warranty card have the extra part where it says 'dealer' or whatever? i'm thinking sigma4less didn't fill out the warranty card..
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dL
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« Reply #13 on: August 13, 2008, 11:20:59 AM » |
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I'm not at home right now. I'll check it tonight k? Pop me an MSN tonight cuz I bet I'll forget. dL |
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w00tgasm
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« Reply #14 on: August 13, 2008, 12:34:41 PM » |
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i haven't seen a single dealer fill out a warranty card.
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dmogx
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« Reply #15 on: August 13, 2008, 01:27:45 PM » |
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ok that's good.. was being paranoid lol
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dL
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« Reply #16 on: August 13, 2008, 01:27:54 PM » |
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That's true. AFAIK, most important proof is your receipt.
dL
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fulminatus
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« Reply #17 on: August 13, 2008, 01:58:19 PM » |
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Hey Dan, I have the sigma 10-20 as well. I think mine has focus issues as well, but I don't have a focus card to test against.
I don't think this will make much of a difference, but i read that f/8.0 is the sweet spot for that lens. But if it's front focusing on 5.6, then there's a problem no matter what.
I bought mine at Broadway Camera and they took part of the warranty card, but didn't fill out any info on mine.
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----== Fulminatus
_(<..>)_
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| '07 Galaxy Grey Mica GT + Moonroof + Lxy, 5spd MT, CM Springs |
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dmogx
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« Reply #18 on: August 13, 2008, 07:08:18 PM » |
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hmmm see, i have the full warranty card lol.. including the bottom part where you tear off that says 'copy for store'..
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fulminatus
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« Reply #19 on: August 13, 2008, 07:47:14 PM » |
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I think that's only necessary if you're buying it at a store. So that you can return to the store and they know you bought it from them and when. So no fake receipts or anything.
Then they'll deal w/the manufacturer on your behalf if they offer any level of customer service.
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----== Fulminatus
_(<..>)_
_____________________________________________________
| '07 Galaxy Grey Mica GT + Moonroof + Lxy, 5spd MT, CM Springs |
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