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Showing results 1 to 25 of 199
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Search: Posts Made By: jimthomson
Forum: Canon Thursday 11th February 2016, 22:53
Replies: 2
Views: 1,303
Posted By jimthomson
That would be correct if those were the distances...

That would be correct if those were the distances that you expect to shoot at. 25 to 50 times the focal length is the number that is usually given for the distance for afma. You adjust based on...
Forum: Canon Tuesday 12th January 2016, 13:21
Replies: 83
Views: 30,130
Posted By jimthomson
Good excuse to buy lottery tickets 3:-)

Good excuse to buy lottery tickets 3:-)
Forum: Canon Monday 3rd August 2015, 20:59
Replies: 38
Views: 15,875
Posted By jimthomson
Strange the manual says: "First attach the...

Strange the manual says:

"First attach the Extender to the lens, then attach it to the camera. To detach it, follow the same procedure in reverse."
Forum: Canon Tuesday 28th July 2015, 11:58
Replies: 46
Views: 25,966
Posted By jimthomson
The frame rate of the 7D2 makes it much better...

The frame rate of the 7D2 makes it much better for birds in flight. 7D2 with 400mm f5.6 will give you better image quality than 5D3 with a 150-600. You can shoot the 400 wide open but with the...
Forum: Canon Wednesday 24th June 2015, 18:59
Replies: 12
Views: 2,854
Posted By jimthomson
Can't comment on the 150mm sigma with OS but I...

Can't comment on the 150mm sigma with OS but I have the 180mm OS version and apart from the weight it's a great lens. I also have a Canon 100mm non - IS for when I need to travel light.
Forum: Sigma & Other Third Party Lenses Wednesday 6th May 2015, 04:07
Replies: 24
Views: 10,394
Posted By jimthomson
Jeff, with all due respect, the lense can be...

Jeff,
with all due respect, the lense can be manually focused on a stationary target to determine it's resolution. The A/F and OS are irrelevant to the resolution. Lenstip reports the best...
Forum: Sigma & Other Third Party Lenses Tuesday 5th May 2015, 18:42
Replies: 24
Views: 10,394
Posted By jimthomson
Not sure why it is humbug. The dock may change...

Not sure why it is humbug. The dock may change focus speed and limits, but these aren,t going to play role in determining the sharpness shooting a static target. A properly AFMA'd lens or a...
Forum: Sigma & Other Third Party Lenses Tuesday 5th May 2015, 16:19
Replies: 24
Views: 10,394
Posted By jimthomson
http://www.lenstip.com/index.php?test=obiektywu&te...

http://www.lenstip.com/index.php?test=obiektywu&test_ob=434

Lenstip just posted a review of the sigma 150-600 contemporary.

Looks like the Tamron is sharper at f8 and 600mm.
Forum: Sigma & Other Third Party Lenses Friday 9th January 2015, 19:26
Replies: 1,450
Views: 438,702
Posted By jimthomson
The digital picture calculated that the Tamron...

The digital picture calculated that the Tamron 150- 600mm was really about 570mm, by comparing the angel of view with a canon 600mm prime.

DPreview gives a measured focal length of 152.4-586.5 for...
Forum: Sigma & Other Third Party Lenses Tuesday 30th December 2014, 00:31
Replies: 867
Views: 236,013
Posted By jimthomson
No, owned longer simply means that you were not,...

No, owned longer simply means that you were not, as you claimed, one of the first to own the lens. You got one of the second batch shipped, just like I did.

Micloi was one of the first to own the...
Forum: Sigma & Other Third Party Lenses Monday 29th December 2014, 19:45
Replies: 867
Views: 236,013
Posted By jimthomson
Yes I own a Tamron 150-600mm, it says so right...

Yes I own a Tamron 150-600mm, it says so right in my signature I've had it since March 18, a couple of weeks longer than you've had yours. I don't use it much for birds as I find the focus speed on...
Forum: Sigma & Other Third Party Lenses Monday 29th December 2014, 05:39
Replies: 867
Views: 236,013
Posted By jimthomson
I agree, it is not rude to call a shot blurry...

I agree, it is not rude to call a shot blurry when it is blurry, but it is rude to call a sharp shot blurry and to suggest that the photographer doesn't know how to hand hold and that there must be...
Forum: Sigma & Other Third Party Lenses Sunday 28th December 2014, 05:17
Replies: 867
Views: 236,013
Posted By jimthomson
For someone who isn't trying you sure do manage...

For someone who isn't trying you sure do manage to be rude. The shot was very sharp. Just look at the lichen between the bird,s feet. I could say that your first shot was not sharp because the...
Forum: Sigma & Other Third Party Lenses Monday 22nd December 2014, 20:47
Replies: 867
Views: 236,013
Posted By jimthomson
] Totally agree with the last paragraph Roy, but...

]

Totally agree with the last paragraph Roy, but I haven't seen anything in Isaac's pictures that would suggest he is disturbing the birds. Birds in urban parks where he does most of his shooting...
Forum: Sigma & Other Third Party Lenses Friday 14th November 2014, 22:29
Replies: 1,450
Views: 438,702
Posted By jimthomson
It comes with a lens hood.

It comes with a lens hood.
Forum: Sigma & Other Third Party Lenses Monday 10th November 2014, 22:20
Replies: 1,450
Views: 438,702
Posted By jimthomson
How about this one?

How about this one?
Forum: Sigma & Other Third Party Lenses Sunday 9th November 2014, 19:00
Replies: 1,450
Views: 438,702
Posted By jimthomson
I actually have both the Tamron and the Sigma. ...

I actually have both the Tamron and the Sigma. The Tamron 150-600 is a much better lens than the Sigma 150-500. Sigma is really soft at 500mm no matter what you do. The Tamron at 600 is soft at...
Forum: Sigma & Other Third Party Lenses Sunday 9th November 2014, 14:16
Replies: 1,450
Views: 438,702
Posted By jimthomson
Sparrow with 400mm +1.4x

Will this do?
Forum: Sigma & Other Third Party Lenses Saturday 1st November 2014, 18:59
Replies: 1,450
Views: 438,702
Posted By jimthomson
Those will do. I like the feathers on the first...

Those will do. I like the feathers on the first one.

Personally, I didn't like the focus speed when using my 400mm and kenko 1.4x with my 500D . There was nothing wrong with the image quality.

I...
Forum: Canon Wednesday 30th July 2014, 22:05
Replies: 90
Views: 23,932
Posted By jimthomson
It has to be right one year. Maybe this is the...

It has to be right one year. Maybe this is the one.
Forum: Canon Wednesday 23rd July 2014, 20:34
Replies: 14
Views: 3,869
Posted By jimthomson
The camera only switches to the SD card if you...

The camera only switches to the SD card if you close the door. If you switch one CF card for another CF card without closing the door, the camera continues to record to CF.
Forum: Sigma & Other Third Party Lenses Monday 21st July 2014, 22:07
Replies: 1,450
Views: 438,702
Posted By jimthomson
Actually nobody uses a 300f4 with 2x. It won't...

Actually nobody uses a 300f4 with 2x. It won't autofocus on anything but a full frame camera and the 300f4 takes a bid hit IQ-wise with the 2x converter.

The comparison that was being made was ...
Forum: Canon Thursday 10th July 2014, 20:34
Replies: 10
Views: 2,164
Posted By jimthomson
The camera has a 1" sensor and the lens is from...

The camera has a 1" sensor and the lens is from 9.1 to 146 mm

I think that you will find that if you plug these numbers into a depth of field calculator that the camera will be fine for landscape. ...
Forum: Canon Wednesday 11th June 2014, 03:41
Replies: 16
Views: 3,867
Posted By jimthomson
I haven't gotten around to AFMA yet. I have...

I haven't gotten around to AFMA yet. I have Focal, but I haven't had the time. Too busy working and taking photography courses at a local college.
Forum: Canon Tuesday 10th June 2014, 01:37
Replies: 16
Views: 3,867
Posted By jimthomson
Roy, I used the keno 300 dgx pro1.4x with a 5D3...

Roy, I used the keno 300 dgx pro1.4x with a 5D3 and the 400 mm f5.6L for several months with out any problem. I only used the Centre point for focus and I did not afma the combination. I didn't,...
Showing results 1 to 25 of 199
 


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