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Author Topic: EF 40mm STM Pancake Problem Acknowledged  (Read 5215 times)

dickymint

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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #15 on: August 08, 2012, 04:32:51 PM »
I love my canon gear....but what have they released lately that doesn't have a fault!,,,,,!

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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #15 on: August 08, 2012, 04:32:51 PM »

bkorcel

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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #16 on: August 08, 2012, 04:51:44 PM »
Just add butter and some syrup and the problem is solved!

aprotosimaki

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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #17 on: August 08, 2012, 08:45:00 PM »
I played with mine some more today.  With the lens mounted to my powered up 5D MK II, I pushed the barrel of the lens all the way back, and did a lot of other screwy things, but it kept on working perfectly.  Apparently not all of them have the issue, or it is particular to certain camera bodies.

I have the problem on a 5d Mk2.

drmikeinpdx

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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #18 on: November 30, 2012, 12:00:19 AM »
I was intrigued by the data that Roger Cicala posted at LensRentals.com.  He says that the 40 pancake is one of the new batch of Canon lenses that have a more accurate autofocus system which can be used to good advantage by the 5D III and 1Dx.  Since they are now going for only $149 I decided it would be an inexpensive way to check out the advantages of the new technology.  Got it a couple of days ago.

I immediately started putting it through my usual focus tests to see if it needed some MFA and just how consistently it focused.  (MFA is not very helpful if a lens does not focus consistently.)

With the lens on my 5D3, I found that it back focused about one foot at ten feet.  I call that 10% back focus.  However, about one shot in five was significantly front focused, maybe 5%.   I changed my working distance and the focus error changed.  Grrrr....

I tried adding some MFA, but the point of final focus was too inconsistent for me to want to use the lens wide open.

I'm sending it back for another copy.  Will keep you posted on the next one.

All of my other lenses work great on the 5D3.  This is the first reject.  Too bad, cause it's a cute lens.

Current bodies:  5D3, 7D, 550D, S100
Favorite lenses: 135 f/2.0 L, 85 f/1.8 200 f/2.8 L, 50 f1.4 Sigma, 40mm pancake, 24-105 L.
blog:   http://www.BeyondBoudoirPhoto.com

Hillsilly

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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #19 on: November 30, 2012, 01:23:34 AM »
Has happened to me once with an Eos 3.  After a few anxious minutes and detaching and reattaching it a couple of times, it started working again.  Since then its been fine.  It happened while I was travelling and the camera and lens were tightly packed in a bag.  I wouldn't have thought it was too tightly packed though....

I'm curious how the firmware upgrade works with a film camera.
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Botts

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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #20 on: November 30, 2012, 02:00:41 AM »
I have the problem on my Elan 7.  I'll post an update after I upgrade it next week.
6D, Sigma 35/1.4, 40STM, 50/1.4, 70-200/4 IS, 430ex II
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dr croubie

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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #21 on: November 30, 2012, 02:42:19 AM »
Wow, i just realised I still haven't gotten around to upgrading my firmware either.
Of course, I don't have a 5D mk3, but I've got a friend who has one I should borrow.

Nice to see I'm not the only one using it on an EOS 3. I just got a PB-E2 for it the other day, looks a bit ridiculous with the 40mm mounted...
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Re: EF 40mm STM Pancake Problem Acknowledged
« Reply #21 on: November 30, 2012, 02:42:19 AM »