KelvinCJ
Topic Author
Posts: 34
Joined: Sat Mar 24, 2012 8:09 am

Update To My 'Another 'Canon 100-400mm Problem''

Fri Aug 03, 2012 3:15 pm

First off, I am sorry for posting another topic on the same subject - and hence for wasting bandwidth etc.

I wanted to post in my old topic but saw that it was archived and hence unavailable for me to do so.

I just wanted to update those of you that very kindly helped and advised me regarding my lens and the possible problem(s) I was having.

I received it back today and am pleased to say that it is a lot better in regards to quality and sharpness. It seems like it was £154 well spent.

Perhaps the most singular evidence I have of the 'improvement' arises from the uv filter versus no uv filter aspect.
Before I sent the lens off for repair, I could see no difference, at all, in terms of image quality or sharpness when using a uv filter or not.

Now, the difference is clear. The quality and sharpness are greatly improved when not using a uv filter. (Even at the 100mm end).

Unfortunately I have not taken it spotting yet but am pleased with my initial findings.

I just wanted to let you all know of my outcome, in case any one else finds themselves in a similar predicament.
 
KelvinCJ
Topic Author
Posts: 34
Joined: Sat Mar 24, 2012 8:09 am

RE: Update To My 'Another 'Canon 100-400mm Problem''

Fri Aug 03, 2012 6:05 pm

I managed to upload two test examples - with a uv filter and without a uv filter. Before I sent the lens off for repair, all my examples appeared like the uv filter crop example - it seemed to be missing that sharpness kick.

UV Filter
http://farm8.staticflickr.com/7272/7705565020_228a8a6ac7_b.jpg

UV Filter Crop
http://farm8.staticflickr.com/7135/7705575418_671f0fed6f_b.jpg

No UV Filter
http://farm8.staticflickr.com/7121/7705574484_605bf967b8_b.jpg

No UV Filter Crop
http://farm9.staticflickr.com/8156/7705566028_222d6fc457_b.jpg

I am pleased with the service centre for fixing my apparent issue, and hope that if any one else finds themselves in a similar situation they either return the lens straight away to get a replacement - or, if out of return time / warranty, consider a repair at the service centre.
 
dlednicer
Crew
Posts: 513
Joined: Sat May 28, 2005 9:35 am

RE: Update To My 'Another 'Canon 100-400mm Problem''

Fri Aug 03, 2012 7:13 pm

I was a lurker on the last thread, but it gave me a good heads up. I sent both of my lenses in for overhaul and it was well worth it. In particular, the overhaul got all of the dust out of my Canon EF-S 17-85mm f/4-5.6 and cleaned up a sharpness drift in my Canon EF 100-400mm f/4.5-5.6L IS USM. Looking at images, I've been able to identify that the drift in sharpness happened in a fairly short time period this spring, but I have no idea what caused it.
 
dazbo5
Posts: 2717
Joined: Tue Mar 29, 2005 8:05 am

RE: Update To My 'Another 'Canon 100-400mm Problem''

Fri Aug 03, 2012 7:33 pm

Quoting KelvinCJ (Thread starter):
Perhaps the most singular evidence I have of the 'improvement' arises from the uv filter versus no uv filter aspect.

Which tells it's own story, don't use a UV filter as it's not needed! UV filters make no difference with digital sensors, only film as digital sensors aren't sensitive to UV. while I see the argument of having a filter on to protect the end element, I've never had the need as the lens hood offers sufficient protection as long as you're careful with your equipment. After all, why pay over £1,000 for a high quality lens than attach a relatively cheap piece of glass on the end? As you've seen, filters effect image quality so personally, I'd leave it in the box.

Glad to hear you're pleased with the results now though.

Darren
Equipment: 2x Canon EOS 50D; Sigma 10-20 EX DC HSM, 50-500 EX APO DG, Canon 24-105 f/4 L, Speedlite 430EX
 
stevemchey
Posts: 339
Joined: Wed Feb 04, 2009 11:41 pm

RE: Update To My 'Another 'Canon 100-400mm Problem''

Fri Aug 03, 2012 7:35 pm

Just out of curiosity, which filter (brand and price) did you use?

I know there is a lot of debate about the usefulness of a UV filter (or the lack thereof). I am often using a filter for protection (especially during wedding shoots, shoots along the beach and sporting events) and can only conclude: If you decide to use a filter, you need to go with the high end ones. A $20 filter only makes your images worse. A $100 UV filter might not improve your images, but at least it doesn't do (much) harm.
 
KelvinCJ
Topic Author
Posts: 34
Joined: Sat Mar 24, 2012 8:09 am

RE: Update To My 'Another 'Canon 100-400mm Problem''

Fri Aug 03, 2012 8:56 pm

Quoting stevemchey (Reply 4):
Just out of curiosity, which filter (brand and price) did you use?

For the shot above I just used the cheap (and nasty!) generic filter that was bundled with the lens. I believe it is this: http://www.amazon.co.uk/Zeikos-ZE-UV...nics&ie=UTF8&qid=1344026793&sr=1-1

So, in answer to your question Stefan: Zeikos ZE-UV77 and around £10 or $15 - exactly as you say - onlymakes images worse. Interestingly enough - after I saw the difference I went straight online and decided to order a Hoya HD 77mm UV Filter - not necessarily for the 'quality' but with the idea of comparing the two - to see just what a difference the 'quality' and 'price' actually makes first hand.

Quoting dazbo5 (Reply 3):
why pay over £1,000 for a high quality lens than attach a relatively cheap piece of glass on the end?

A very good point - and I must agree with you there. I think paranoia is the major component of my desire for a filter however. I would much rather clean the surface of a uv filter to remove dust etc. than the surface of the lens - incase of a scratch or mark.

Thank you for your replies, and I am glad you found it a worth while experience David.
 
ckw
Posts: 4586
Joined: Fri Aug 27, 2010 12:26 am

RE: Update To My 'Another 'Canon 100-400mm Problem''

Fri Aug 03, 2012 11:25 pm

I'm not a fan of filters, but will use one in adverse conditions - note that Canon states that its L lenses require a filter to acheive full weather proofing. Of course a cheap filter is not a good idea - if you need one, expect to pay big money for a quality multi coated filter from, for example B+W

Cheers,

Colin
Colin K. Work, Pixstel
 
comairguycvg
Posts: 235
Joined: Sun Jan 22, 2006 5:01 pm

RE: Update To My 'Another 'Canon 100-400mm Problem''

Sun Aug 05, 2012 1:58 am

I had a filter on my 100-400 L lens and removed it. Images were soft looking because with a filter, it's just another layer of glass the lens has to look through. More layers = more softness. I think mine was a Promaster.
Worked at: CV62, RJTA, KNLC, CV63, KNFL, OKAJ, KTRI, CV67, KMGE, KNQX, KVPS, KPIT, KCVG, KTYS, KATL
 
vikkyvik
Posts: 11760
Joined: Thu Jul 31, 2003 1:58 pm

RE: Update To My 'Another 'Canon 100-400mm Problem''

Sun Aug 05, 2012 9:56 am

I don't have a 100-400, but typically leave a UV filter on my 70-200 F4. Just for kicks, I shot the other day without the UV filter. I didn't notice any difference.

I use Hoya filters.
I'm watching Jeopardy. The category is worst Madonna songs. "This one from 1987 is terrible".

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