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Topics - vargyropoulos

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Lenses / optimal distance for accurate focusing
« on: June 13, 2014, 10:06:17 PM »
I've been doing some testing lately with my 7D and different lenses including my 50mm f/1.4, 100mmf2.8L, 400mmf/5.6L and the 600mmf/4 +1.4 extender. I seem to notice a steep drop in image quality if the focus point is farther away.

the 50 for example is tack sharp when I have a standing model filling the frame in portrait orientation but I found the images softer when I shot further back to have the standing model with room in frame while on landscape orientation.

today I borrowed a 600 + extender and I went out to one of my regular birding areas where I take my 400 normally. I framed a white egret in a similar manner but I found the images from the 600 softer, especially with the extender on. even though the camera beeped to signal focus lock, the whole image was blurry. close-ups were no issue, I got some very sharp images when the bird was 20 yards or closer.

is this normal behavior? is there a guide anywhere that would describe what distances are more optimal for different focal lengths? do I need to simply stop down my aperture for subjects that are further out?

Lenses / "Affordable" telephoto lens for wildlife
« on: October 31, 2012, 02:17:47 PM »
Hello, I need some advice on an "affordable" telephoto lens which will be used primarily for wildlife. initially I will be shooting birds and other animals within the parks in the New York city area, later on I plan to head upsate to see if I can find raptors (owls, hawks, eagles, etc). I currently have the EF70-300mm and unless I am shooting with very bright light it does not give me the sharpness that I would like.

I tried the 100-400L earlier this summer and it appears to be a decent lens
other lenses that look good on paper (price and features) are the 300F4 and the 400F5.6.
I am also considering the 70-200f2.8 ISII and a 2x converter

Does anyone have any opinion on choosing between the above mentioned lenses, or even to propose another lens/combo at a similar price range? AS far as bodies are concerned... either 5D3 or 7D... still debating on that one....

Hi all,

I recently had the opportunity to try out the 5D3 at Canon's "Photography in the Parks" (Yosemite) and I must say that I really like this camera so much that I'm trying to find a place for it on my Christmas shopping list. While I do shoot different things ranging from landscapes to street photography it looks like macro photography is what I am most passionate about. I currently have a digital rebel XT (8MP) which I use for wildlife and Macro as well as an AE-1 (35mm) which I use for landscape, street and portrait photography.

so here is my question: Since I like to shoot insects up close as possible to MFD and on my rebel XT I noticed that the sharpest images are at F/8 - F/11, would the 5D3 give me better detail resolution than say the 7D or whatever they replace it with? Assuming that I will be shooting at F/11-F/16 which is sometimes required to get as much of the insect inf focus.

I've been reading a few articles regarding DLA and I'm wondering how much of an effect does it have on image quality vs the pixel density of the APS-C camera. apparently the 5D3 has similar pixel density to my current DSLR and DLA of 10.4 where the 7D has a DLA of 6.9

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