ChrisA

Joined: 4th January 2007

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ChrisA
thoughton wrote:
Regarding your comment about softness at the edges in extreme closeups, I've also noticed this and after some investigation I think it is to do with the field curvature i.e. the view is so wide that sometimes objects right at the edge can be simply too close to be within the DOF.
Would this not also be a characteristic of a completely flat field?

Comment by ChrisA posted on First few with the SIgma 10-20 at 04/08/2010 - 14:19

ChrisA
polchraine wrote:
ChrisA wrote:
plus £8 for the Post Office's 'check and send' service.
What a con ... nothing that you cannot do yourself and in fact should do.
Well of course that's true regarding the checking, and indeed I did.

However, as you'll see from Direct.Gov, it also includes all the postage costs, and is supposedly both quicker and less likely to get snarled up in the system.

All the "for official use only" bits on the form did get filled in and stamped in front of me, so it may well end up on a some sort of "already checked" pile when it gets to IPS.

For the difference between £8 and what it would have cost me anyway to send it SD, I thought it was probably worth it, and 9 days turnaround was a lot quicker than I was expecting.

Comment by ChrisA posted on Passport photos at 04/08/2010 - 11:29

ChrisA
Pleased to report that the mug-shot I took of myself for my new passport was accepted - I didn't print it myself, but I did do everything else.

The walls in my house are nominally white, but under ambient light come out looking light grey, so I just sat on a chair with the remote control F, and took pictures until I got one that I could bear to keep.

Then I did a bit of minor PP, followed by a lot of fiddling about until the dimensions and facial proportions matched the regulations, and made a JPG file with four copies and suitable borders.

Took it down to the local photo printer, who charged me an exorbitant four quid to print them and clip them out.

Pretty painless, and the passport came back in 9 days.

£77.50, though, plus £8 for the Post Office's 'check and send' service.

Comment by ChrisA posted on Passport photos at 04/08/2010 - 09:38

ChrisA
helios wrote:
If your budget is tight the DAL version of the 55-300 is certainly worth considering as the saving is considerable - £159 compared with £279 for the DA version at SRS. I understand that they are optically the same.
The absence of quick-shift is worth considering, before going for the admittedly substantial saving.

It has a long focus throw, the 55-300, which means that AF can be very slow if it has a long way to go.

In particular, if you're using it for moving objects, and you lose the AF point, the lens will quite often hunt to infinity (or worse, the close point). It can then be very slow to find your subject again.

In both these situations, quick-shift is a huge benefit, since you can whip the focus ring round to approximately where you need it, and the AF then has very little to do, so it's quick.

I'd hate to lose it. It would make using the lens at airshows enormously more difficult.

Comment by ChrisA posted on Lens Hood for Pentax 55-300 DAL at 03/08/2010 - 15:03

ChrisA
gregmoll wrote:
>
> The next time Mars may come this close is in 2287.
>
> Share this with your friends as NO ONE ALIVE TODAY will ever see it again.
Snopes comes to the rescue once more...

Comment by ChrisA posted on Moon shot at 03/08/2010 - 07:49

ChrisA
johnriley wrote:
In that instance Chris we would still be using the AF system to confirm focus.
Quite - which is why I can't see why you wouldn't get the same BF/FF issues (if they're there in the first place) as with ordinary AF.

Quote:

If the camera's collimation is correct then using our eyes should get the right point of focus, subject of course to our ability to judge that point.
Well yes indeed. Judging it visually you wouldn't suffer from errors in the AF system.

I'm fortunate enough to have pretty good eyesight, but I don't think I can judge the focus point better than the AF system can - especially with long lenses where shallow depth of field makes it all so critical.

Comment by ChrisA posted on K10D Back focusing Issue at 31/07/2010 - 12:25

ChrisA
Mannesty wrote:
This problem does not occur with MF lenses, or AF lenses in MF mode.
Is this really true?

Given that you get focus confirmation when focusing manually, why might the actual point of focus not be different from where the camera thinks it's focused, and for the same reason as with AF?

Comment by ChrisA posted on K10D Back focusing Issue at 31/07/2010 - 11:24

ChrisA
prsjnb wrote:
...I will seek other opportunities to improve my technique...
I notice you live in Wiltshire, so if you're up for a bit of a drive, you might consider visiting one or more of the smaller airfields that aren't too far from you.

In particular, I'd recommend Compton Abbas, near Shaftesbury. Not only is it a particularly attractive field, but there's often lots going on, including aerobatics, and has the added benefit of having a restaurant where you can sit outside and be easily close enough to the action to photograph landing and departing aircraft.

And if you were to venture east instead of south, there's White Waltham near Maidenhead, which is also a busy field with lots going on. It's where I'm based, so if you fancied a trip, I could show you around. PM me if you want to set something up sometime.

Naturally this offer extends to others too.

Comment by ChrisA posted on Aircraft of the Battle of Britain Memorial Flight (4 images) at 29/07/2010 - 09:11

ChrisA
Anvh wrote:
@Chris, I hope I've answered all your technical questions if you've any other questions I'm happy to answer them all.
I'm not prepared to talk about morals about me or any one though.
Yes you have, and I appreciate your taking the trouble to answer. Of course, Gwyn was right to draw attention to my failure or others', to comment on the earlier thread. It was just a little unfortunate that I happened not to see that, but I did see this one.

I'm not making any comments about anyone's morals, and nor would I expect anyone to do so - as far as I'm concerned, there's no moral issue to answer. Personally I think it's a shame that there's a perceived need for anonymous posting, since accusations of biased judging are IMO entirely without foundation. But I can see that some would think it a good idea, and an anonymous PhotoBucket account would solve that.

I'm slightly troubled by the notion that someone can learn how to operate a dSLR, take pictures good enough to enter in competitions, participate in an internet forum, but still not be bothered to learn how to resize and post their own images, but I suppose they shouldn't be disenfranchised.

I wish the new format well, and as I've said, I'm always grateful to those that are prepared to take the time to organise this sort of thing.

Comment by ChrisA posted on Voting competition #1 - Cycles at 27/07/2010 - 23:21

ChrisA
Gwyn wrote:
There are plenty of people who are willing to criticise but don't seem willing to offer constructive alternatives.

This was all discussed in another thread. If you really object why did you not read the other thread and contribute to that before this was arranged?
If this is aimed at me, then I confess that I do take a little exception to it.

I didn't respond to the other thread, since for whatever reason, I hadn't been aware in enough detail of its content. And now I thought I was both attempting to be constructive, and also acknowledging that I might be a little late into the game.

If you think I'm objecting, perhaps if you read what I said again you'll see that I was suggesting and questioning, not 'really objecting'.

Quote:
Stefan thought this was a good way to continue with this competition since those who did contribute liked the idea of an anonymous competition.

If you enter your own hosted photo people can see who it is by looking at the URL. Hence the Photobucket account, to make it truly anonymous.

I still think not seeing the photos until voting means people are not influenced or put off by other entries.
Yes, I take this point, although I'm not yet sure if I agree. In particular I'm uncomfortable about having pictures online in an account over which I have no control, but thank you for clarifying.

Quote:

I shan't bother to enter any more competitions. This is all way too much hassle.
It would make sense not to want to organise any more competitions due to the amount of hassle.

Declaring that the hassle makes you not even want to enter them smacks of throwing toys out of the pram.

I'm grateful to anyone who's prepared to take up the administrative mantle of organising something of benefit to all. But I find my gratitude wanes somewhat when genuine questions and suggestions, if perhaps not sufficiently researched, are treated in this way.

I'm not sure I'd feel Ok about entering a competition if questions about its organisation are treated so stroppily.

Comment by ChrisA posted on Voting competition #1 - Cycles at 27/07/2010 - 17:16

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