Serene Life

by garik

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3,015 reputation
11146
bio website fierydragonlord.com
location New York, United States
age
visits member for 3 years, 7 months
seen yesterday

I'm primarily a computer and photography enthusiast, but I have a variety of other interests as well, from video games to fountain pens. I take the accuracy and correctness of my contributions very seriously; if there are any problems with my posts, feel free to edit them or let me know in chat if you have any questions or comments.

As a photographer, I use a Pentax K-5 (as well as a K-r as a backup or secondary camera), with a small selection of Pentax lenses. You can also find me on Pentax Forums.


Gravatar derived from D&D red dragon on Wikimedia Commons, courtesy of LittleDrakon, CC BY-SA

Note that I'm not really into tabletop RPGs. I simply felt that this image suits me best.

profile for DragonLord on Stack Exchange, a network of free, community-driven Q&A sites


Oct
17
accepted What apertures are required to enable autofocus, including cross-type or high-precision focusing, on Canon DSLR cameras?
Oct
15
comment What apertures are required to enable autofocus, including cross-type or high-precision focusing, on Canon DSLR cameras?
This is all in the manuals, but it would be more convenient if there was a comprehensive list that can easily be found. I decided to "seed" this question and answer to help Canon users with regard to what their lenses allow in terms of autofocus.
Oct
15
revised Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
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Oct
15
answered What apertures are required to enable autofocus, including cross-type or high-precision focusing, on Canon DSLR cameras?
Oct
15
asked What apertures are required to enable autofocus, including cross-type or high-precision focusing, on Canon DSLR cameras?
Oct
8
comment Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
... which is why allowing both requires additional AF sensors, one for faster lenses and one for slower lenses. This is the approach Canon takes in its AF systems. Nikon, Olympus, and Pentax don't take this approach, which may explain why the Pentax DA* 55mm lens shows variable accuracy on different camera bodies, as noted in the conclusion of dpreview's review of this lens.
Oct
8
accepted Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
Oct
8
comment Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
In any case, while every phase detection AF system has a hard limit (typically around f/11 AFAIK), the fact that Canon has these limitations that are set above these hard limits means that this answer most directly answers the question.
Oct
8
comment Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
To help understand this, I tried looking through the viewfinder of a manual focus film SLR with split prism focusing aid. I noticed that that opposite parts of each side of the split prism blackens as the lens stops down in depth-of-field preview, and that focusing with the split prism is no longer possible by f/16-22 - even with a bright flashlight aimed at the center of the lens. It seems this would explain why phase detection doesn't work past a certain aperture. Though it may still function to an extent beyond f/8, it certainly won't work at f/16.
Oct
8
comment Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
From what I've read, the tape trick results in unreliable AF. The camera may cope in brighter conditions with high contrast, but will hunt and fail to acquire focus in low light or low contrast, depending on the camera body.
Oct
8
revised Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
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Oct
8
revised Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
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Oct
8
revised Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
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Oct
8
comment Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
I don't have a Canon DSLR, but this is something that I don't find with Nikon, Olympus, or Pentax (the system I use). I also recognize that high-precision points truly require the specified apertures, but the fact that a certain minimum aperture is needed for AF to work at all on Canon raises this question.
Oct
8
revised Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
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Oct
8
asked Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
Oct
6
accepted How should I set up a flash bracket for Pentax?
Oct
6
comment How should I set up a flash bracket for Pentax?
So is the P-TTL functionality provided by the wired connection and shoe adapters worth the extra cost? What situations would make this functionality useful or necessary?
Oct
5
comment How should I set up a flash bracket for Pentax?
Diffusing doesn't work for me. I haven't used red-eye reduction much, so I'm not sure if this helps, and this introduces a significant delay before the shutter is released.
Oct
5
comment How should I set up a flash bracket for Pentax?
The problem is that bounce flash is not always an option. I would use it if this was possible, but I often don't have a usable surface to bounce the flash from. I don't do studio shooting - I'm shooting events where I cannot make complex lighting setups.