July 28, 2014, 01:47:22 PM

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Topics - candc

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Photography Technique / dof calculator ff vs crop
« on: March 03, 2014, 12:19:47 AM »
Here is a link to an online dof calculator

http://www.dofmaster.com/dofjs.html

I understand that as focal length increases, dof decreases and as subject distance decreases then dof decreases. If you use the online calculator it will show less dof at a given distance and fl using a crop sensor opposed to a ff one? I don't see why dof would be any different. The crop sensor is just looking at a smaller part of the image circle that the lens is projecting so it should be the same as cropping a ff image. Why would the dof change if the fl and distance are constant?

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Lenses / Ken Rockwell reviews canon 50mm f/1.0
« on: November 20, 2013, 07:12:17 PM »
with all the buzz about the otus i thought this was interesting

http://www.kenrockwell.com/canon/lenses/50mm-f1.htm

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Third Party Manufacturers / Nikon Shmikon
« on: November 08, 2013, 08:50:30 PM »
C'mon Canon, let's see the AE-1D!

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Third Party Manufacturers / sigma 120-300 review at dxomark
« on: November 03, 2013, 10:37:01 AM »
http://www.dxomark.com/Reviews/Sigma-120-300mm-f2.8-EX-DG-OS-HSM-S-Canon-and-Nikon-mount-lens-review-Prime-image-quality-in-a-zoom

i have pointed to some other reviews of this lens also, i really like it a lot and i think you should give it a good look if it suits your needs.

dxo ranks it #1 on the 5diii for zooms

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Third Party Manufacturers / sigma 120-300 review at petapixel
« on: November 01, 2013, 09:27:46 PM »
http://petapixel.com/2013/11/01/review-sigma-120-300-f2-8-one-sexy-beast/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+PetaPixel+%28PetaPixel%29&utm_content=My+Yahoo

this is a very good lens and is very good for wildlife on a crop body. some are scared off by the talk that it is bad with tc's. i saw the test shots with the sigma tc's at tdp and they look horrible? i decided to buy the lens and experiment myself. from what i have found so far:

it is really good with the 1.4x kenko pro/promaster, sharp, good af, good all around

the kenko pro/promaster 2x is sharp but the colors are washed out and it overexposes by +1 ev fast af but inconstant

canon 2xiii has slightly slower but better accuracy and constancy af, better colors and contrast, same sharpness as kenko pro but performs better in real word shooting

i will try and do some comparison shots and post this weekend

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Third Party Manufacturers / sigma dock autofocus adjustment
« on: October 30, 2013, 10:10:50 PM »
i have the sigma dock and have had to use it on both the 120-300 and 18-35 which were grossly off. after doing focus adjustments on the lenses i have found that they work the same on the 2 70d's and the 40d which i have tried them on. that tells me the problem is with the lens itself and not the camera/lens pairing and also why afma with the camera doesn't work very well with the new sigma lenses, ae frontfocusing close and backfocusing at infinity and everything else in between. i am a big fan of what sigma is doing with the new products but i think this inexcusable and i will also write them and tell them so.

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EOS Bodies - For Stills / progress of digital photography.
« on: October 12, 2013, 02:48:05 PM »
I've made a few post here so I get ae-1 next to my name, made me think I should bust my ae-1 program out of the closet! Then I thought about how 15 or so years ago we were amazed to be able to just take a picture and look at it on the computer. Look where we are now, its an incredible progression in such a short time?

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Canon General / decisive moment
« on: September 27, 2013, 08:51:16 PM »
When I started out I never had a motor drive so I always had to try and anticipate the decisive moment. I still shoot that way but I suppose I am not taking advantage of what the modern camera can do. I guess if I was shooting for a living I would feel obligated to shoot a sequence to deliver the best shot to the client but that kind of takes some of the excitement out of it for me, what do you think?

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Lenses / digitalrev return policy
« on: September 23, 2013, 07:22:29 PM »
i was interested in the sigma 18-35 but they are not in stock anywhere here in the states so i bought one from digitalrev. it arrived and i loved the lens but it had really bad af issues. their website states that they have a "14 day no questions asked return policy". i submitted a return request in that time but did not hear back from them for a few days at which time they "regretted to inform me the return period had expired". some emails back and forth and they agreed to accept it back with a lot of "ifs". i have to pay return shipping and if they determine its a manufacture defect they will reimburse etc. i shouldn't. have to do this but i got a sigma dock and spent all day getting to work in a  usable way so i am still happy to have it but i would warn anyone considering buying from them to keep this in mind.

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