September 22, 2014, 12:31:30 PM

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Messages - cdn_photog

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1
Thanks mackguyver.

2
I had a chance to try again. I cleaned the contacts per Canon's advice, hung my camera bag from the tripod for extra stability, and used better lighting. It was a big improvement over the first attempt (at the same AFMA setting, so that wasn't the problem). Still not 100%, but probably 98% so I am happy with that.  Just goes to show how many little details there are that affect picture quality. Thanks again for all the advice & tips.

3
@mackguyver - Thanks for the tip about lighting. I think I had the camera locked down pretty tight on the tripod, but probably could have used more light. I will try that.  IS was off. I was shooting from about 20 feet, 25x 280mm is ~23 feet so not quite where I need to be but that is the longest stretch of hallway I have.

@valvebounce - I'm sure I attached the extender to the lens first, and will make sure I do when I try again.

I emailed Canon and they recommended cleaning the contacts before giving up and sending it in for service, so there are still a few variables I need to eliminate.  Thanks all for the tips & advice.

4
@mt spokane - thanks. I will try renting a v2 extender and a different copy of the lens to see if that makes any difference. If my combo is the only one with this issue then I probably will have to send it in.

@horshack - I have tried AFMA settings on either side of this setting and this is the best one, with consistent results. I didn't test other focal lengths because if I have the extender on the lens is always at 200mm.

5
Thanks horshack.  I think I have the AFMA at the best possible setting, based on multiple tests, it just isn't quite as sharp as when focusing with Live View.

6
That is an interesting point. I should rent a v2 1.4x extender along with the 70-200 f4L IS and test all the combinations. It looks like I can get both.

7
The 1.4 extender is version 3.  Purchased last year, as was the 70-200 f4L IS.

8
I just did some more quick test shots. Using the 70-200 at 200; 24-105 at 105; and 100L macro. The shots taken with live view vs viewfinder look to be very consistent in terms of sharpness. So it must be something to do with the extender. Odd.

9
Not really, but I could always rent one. Maybe I should try to rent a different 70-200 f4L IS to see if the same thing happens. If I rent anything better than what I already have that will likely lead to upgrading.

The result I got, with a bit of sharpening in software, was enough of an improvement over what I was getting that I was pretty happy with it.  Until I saw how much better the live view version is. I usually photograph outside, birds, animals, etc, so using live view is not a practical option most of the time.

10
This is the only combination that I am struggling with. I used FoCal on my others (100L macro, 24-105L, and 35 f2.0 IS) and they all seem to be working as expected.  The 70-200 on its own seems to be working fine too.

11
Thanks neuro. But if it is an issue with the camera, lens, and/or extender, wouldn't both images be the same?  i.e. show the same defect?  It seems to me that I almost need a 0.5 adjustment as 1 either way made the image worse.  Although I'm not even sure if this is a front/back focusing problem. The lines on the ruler in front of and behind the 9 don't seem any sharper than on the 9 itself.

12
I have been struggling to get really clear photos from my 70-200 with the 1.4xIII extender so I tried to dial in AFMA on the weekend. I know there will be some image degradation when you add an extender, but that is not what I am asking about. I tried to keep this as apples-to-apples as possible, test shots were done indoors, on a tripod, with 10 second delay timer & mirror lock up, using a remote cable release, IS turned off, so there should be no movement.  But try as I might, I can't get the shots taken through the viewfinder to focus quite as sharp as live view. I used FoCal, and also did some shots on either side of the suggested AFMA setting, and the best I could come up with is shown, with a setting of -2. Am I missing something here, or is this about as good as I can expect?

These images are 100% crop, not adjusted at all, just converted from RAW to JPG and then cropped.

Larger, uncropped versions are https://www.dropbox.com/s/4za1f2452khry6l/5D3_3770.jpg and https://www.dropbox.com/s/5f2ocshddkx747h/5D3_3776.jpg.

Thank you for your help.

13
Animal Kingdom / Re: Show your Bird Portraits
« on: May 01, 2014, 12:32:25 PM »
Canada Goose, St Albert, Alberta

14
Software & Accessories / Re: Alternatives to RRS MH-02 Monopod Head?
« on: March 27, 2014, 11:19:03 PM »
I have been using a Benro DJ90 monopod head with good success. My heaviest lens is 70-200f4L on a 5D3, so not as heavy as what the OP has. I can't find it on the Benro website anymore, I bought mine at Vistek (in Canada).

http://www.vistek.ca/store/ProPhotoTripods/252936/benro-dj90-monopod-tilt-head/Specs.aspx


15
I am using a QR setup similar to Neuro's system - I have a Benro tripod, head, and QR plates, and a second Benro QR clamp that has a Manfrotto QR plate attached to it using the BlackRapid FR-T1 so I can use both my Benro tripod or my GorillaPod with my old Manfrotto ball head without having to change/remove the plates.  It works well, but is a bit bulky, so for day-to-day shooting I threaded an Optech Utility Loop through the camera strap lug and clip the BlackRapid strap to it (shoulder or hand-strap, depending on the day). It works great with shorter lenses (ie 24-105 zoom). If I have a heavier lens, or am walking around with the shoulder strap, I clip the strap to another Utility Loop that is attached to the vertical grip, and run a safety strap from the camera lug around the BlackRapid strap.

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