Gerry Winterbourne

Lives in United Kingdom Berkshire, United Kingdom
Works as a Retired
Joined on Mar 24, 2007
About me:

K-3
K-5
Sigma 8-16/4.5-5.6
DA 35/2.8 macro ltd
FA 50/1.4
DA 70/2.4 ltd
DFA 100/2.8 WR macro
DA* 200/2.8
Tamron SP 300/5.6 tele-macro
Pentax AF Rear Converter 1.4X AW
Kenko 2x DGZ TC
13, 21, 31mm extension tubes
Q
8.5/1.9 (01)
K-to--Q mount adapter
AS540FGZ
AS360FGZ
3 tripods

Gerry Winterbourne's recent activity

  • No. First, natural blur increases with distance from the focus plane whereas yours id uniform at all distances. Second, you've missed a big area at bottom right. With practice it is possible to ...
  • Replied in Black & White
    I suggest you consider it an example of how not to take a photograph and throw it away. There is no obvious subject of any interest, there is a huge area of boring tarmac, some cars cut off by the ...
  • That's not necessarily true. If you run the numbers through a conventional DOF calculator that's what the result will show but there's a big snag: conventional DOF calculators ignore diffraction. F ...
  • Replied in Photo Critique
    Unfortunately that's not the story I see. I see two adults apparently enjoying the beauty of the spot and three children ignoring the beauty and playing. And there's not really much connection ...
  • As explained earlier in the thread, each AF "point" (really a line or a cross) is the same size on both cameras; it's just that on DX the same number of points covers a larger proportion of the ...
  • Over what period? If the data are over a period shorter than about 20 years they won't be useful in considering the effect of generational differences. The camera industry, in common with many ...
  • I don't see that it's much, if anything, to do with the younger generation - and which generation is that anyway? Since 1900 or thereabouts the camera industry has been split into two: a small ...
  • I don't think you do. The subject is the same distance from both cameras so its perspective stays the same. All you are doing with a crop-sensor camera - of course - is taking a crop from the same ...
  • I repeat - try counting the number of people who use these forums (or, at least, the ones who post). It's tedious but instructive - go through each thread in turn and count the number of new names ...
  • By "you" I think you mean "I". I use a touch screen on my phone; it's reasonably accurate for identifying broad areas for focusing on. But when it comes to identification of the focus point for ...
  • Have you counted how many members there are here? Try doing so - there are hundreds upon hundreds. So ~10% of that is a lot of people - "so many". Neither. It's just that you don't have a proper ...
  • Not during the act of changing but as long as both the body and the lens are weather resistant the join will be sealed so the combination will be weather resistant before and after the change.
  • Replied in Related issue
    Trails like this are made by just feeding too much fuel into the engines so what comes out is droplets of unburned fuel, which can be dyed for coloured trails. Not the same as the smoke that is ...
  • The article refers to standards of ingress protection (IP ratings). I doubt if anyone seriously claims a camera to be weather proof , although many customers probably think that's what's on offer. ...
  • It really means moving focus from near to far and back again, but if the lens needs only a short movement the result is that focus hunting is fast and not a problem. It's only when the focus throw ...
  • Replied in Raw Conversion
    I'll start with what our eyes can distinguish. Look at this chart and you can make out the difference in brightness, at least over part of the range. That's with about 40 gradations; we can ...
  • No. Yes. Macro lenses tend to be very sharp so they can pick out skin wrinkles when used for portraits but that's easily softened in processing if it causes a problem. To focus very close they need ...
  • Replied in Lenses
    Yes, as other people have explained those lenses will work on a Pentax digital camera (directly) or on many other digital cameras via an adaptor. But "work" means they'll do the same as on the old ...
  • OK. Now we know you've been using the camera for a few years we can think in more detail. But it seems your photography has been pretty casual so you'll still need to develop your technique to get ...
  • I agree with the people who advise against buying any lenses now. I've underlined "ultimately" in your note above because it's the crucial point. Your kit lens isn't brilliant but it will give you ...
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Total messages 10757
Threads started 148
Last post 59 min ago
Total comments 4
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Last post 2 weeks ago
Total reviews 1
Last review Mar 24, 2007
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