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Messages - Skulker

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121
Canon General / Re: Are Metal Mounts Better Than Plastic?
« on: January 04, 2014, 06:19:09 PM »

The fibers in carbon fiber components are usually from a cloth so alignment is easy.... It's sort of like with fiberglass.you could lay up fiberglass cloth in a mold or you could use  "chop glass", where short fibers were blown in place.... The chop layup is faster and cheaper, but the laid up cloth is both lighter and stronger.

BTW, we use carbon-fibre dishes in aircraft and on the satellites..... They are far better than metal dishes, particularly with thermal stability and weight.

You won't find may bits in a mass production lens made that way.


Edited to correct typo.

122
Canon General / Re: Are Metal Mounts Better Than Plastic?
« on: January 04, 2014, 06:09:50 PM »
I think that most people will mean the bayonets when they refer to "mounts". It may be that Roger knows better. Maybe people complain when the "mounts" break and from Rogers experience it's what he calls the mount that breaks rather than the bayonet.

On the subject of plastic mounts. Be they bayonets or what the bayonet mounts on. Many will be made of a filled  plastic. That filler may be glass, carbon, ceamic or inert filler as there are several options. It can be in the form of fibers, beads or powder as well as the obvious options of woven material that you probably wouldn't expect in a bayonet, but might well find in a mount as defined by Roger.

There are also several options for the matrix as well. Epoxy is not the most likely for this type of application.

The obvious problem with bayonet mounts for lenses is wear. As the lens is mounted and removed it may well be subject to abrasion. If it wears and the filler is exposed it can create a very abrasive paste or dust that may wear even more, and get in the camera. Thus causing even more wear.

Please don't think I don't like plastic, I'd quite happily buy a lens with "plastic" bayonets. But I wouldn't expect to see them on my 200-400 when I get it. (in my dreams)

123
Canon General / Re: Are Metal Mounts Better Than Plastic?
« on: January 04, 2014, 05:49:37 PM »
Look at the mount on the body, it's metal, but what is it attached to?

Umm, I think you have supplied your own awnser. The Body.  ;D

On my 1Dx that's made of magnesium BTW. But of course its weather sealed and Profesional quality.  ;D

I think your making a perfectly valid point, just couldn't resist the silly reply.

124
EOS Bodies - For Stills / Re: 5DMkIII AF performance at f/8
« on: December 30, 2013, 05:32:20 PM »
..... Under it is the same image reduced by 1.6x1.6 times the number of pixels (= 750x594) to mimick what would be the effect of going to FF with the same no. of megapixels on the sensor. .....

You are "mimicking" a negative of the "FF", while not making any allowance for the many other differences.

For a valid comparison I would recommend that you use images for the systems you attempt to compare.

125
EOS Bodies - For Stills / Re: 5DMkIII AF performance at f/8
« on: December 29, 2013, 05:29:33 PM »


from what I see there's no inexpensive way to get cracking shots at long focal lengths on a budget.



I think you will find that's pretty accurate.


Of course some people will not agree, but that's the interweb thingy for you.

126
EOS Bodies - For Stills / Re: 5DMkIII AF performance at f/8
« on: December 19, 2013, 01:15:18 PM »
I would suggest that you are better off sticking to the 7D with the 100-400 rather than shooting with the FF + 100-400 + 1.4TC.

I tried this combo and it worked reasonably in good light. That said, if you are looking for pixel level sharpness, forget it. Also, if you are shooting birds in the trees, you lose AF, hit a max aperture of f/8 and in dark foliage, are at ever increasing ISOs to render the images unusable.

Personally, I would prefer to use the extenders only with a f/2.8 or a f/4 lens.

I never used the 1.4 with the 100-400, in fact I never used the 1. with the 7D much. It just never worked much for me.

I do use the 100-400 with the 5D3 and find it better than with the 7D. I certainly don't miss the "crop factor", its so much better I get more detail anyway. I also use that lens with the 1Dx and while its not top quality its a great versatile lens.

127
EOS Bodies - For Stills / Re: 1DX Battery Issue?
« on: December 19, 2013, 01:09:54 PM »
Sounds like very strange behaviour. If it keeps doing this you might like to send it back for checking.

Looking at you post last month, you don't have much luck with batteries do you.

128
1D X Sample Images / Re: Any Thing shot with a 1Dx
« on: December 15, 2013, 03:31:56 PM »
I was going to Post this Image in the "Bird Portraits" section, after all, it is a BIF.

Except in this case it's a Baboon in Flight, similar, but different.

1Dx 400f/2.8, Shot @ f/2.8 & 1/5000th ISO200

Great image!

Very well caught.

129
I start with the assumption that Canon know a lot more about making cameras than I do.

That's the spirit, I'll remember to nominate you for the "Canon compliance of the year" award :-p ... but you're correct, not every design decision is "crippling", but as it happens this one is different because ML has proven that auto iso with flash is no problem at all - you can use other iso settings manually, so there is really no reason why the camera shouldn't be able to select the iso according to the ambient light as usual and then let ettl decide the rest.

You mean as my 1Dx does, as I just pointed out.  ;D

I guess your 1Dx is different from my 1D X.   ;)

The issue at hand is when a Speedlite is attached, Canon cameras default to ISO 400 when they are set to Auto ISO.  Are you saying your camera does something different?

I'm not sure if mine is diferent to yours? Send me yours so I can carry out some tests if you like.  :)

I use a 580ex11 on camera or on an extension lead., and most of the time it defaults to ISO400. But sometimes it goes to ISO6400. The manual indicates that it will go to ISO1600. I freely admit I'm out of my depth with flash. I hardly ever use it and find it a bit of a black art. Why the owl shot I put in this tread was at ISO1600 and the one next to it was at ISO400 I have no idea. There is a color cast to the owl so maybe the flash was overheating?

130
I wrote another topic about this, but here is my observation:

I've find a cool way to use safety shift in 5D. If you use Tv mode and safety shift (ISO), camera will use as high ISO as needed. It actually works identically w/wo flash.

The best thing is that you can use autoISO or set ISO manually. If you set ISO manually, consider your setting as a minimum ISO setting, camera will rise it anyways when needed. This is very nice feature in low light, where fill flash is needed. You can, for example, set high ISO to have f2-2.8, but when it gets darker, f1.2-1.8 are used and if that is not enough, ISO will be risen even more.

That's interesting. I will see if I can use it.

Here's one I took earlier.  ;D  its ISO 1600. and 100% crop, NO PP in LR4, NO NR, NO sharpening etc etc.


131
I start with the assumption that Canon know a lot more about making cameras than I do.

That's the spirit, I'll remember to nominate you for the "Canon compliance of the year" award :-p ... but you're correct, not every design decision is "crippling", but as it happens this one is different because ML has proven that auto iso with flash is no problem at all - you can use other iso settings manually, so there is really no reason why the camera shouldn't be able to select the iso according to the ambient light as usual and then let ettl decide the rest.

You mean as my 1Dx does, as I just pointed out.  ;D

Thanks for nominating me for "Canon compliance of the year". Its really appreciated.  Now where is that sarcastic emoticon when you need it.  >:(

As someone who spent many years in product design and development I find it really irrational that people claim companies deliberately downgrade equipment as a matter of course. It may well happen but it is not something that I ever saw in the real world.

132
... I understand from the debate I generated that this ISO auto = ISO 400 is clearly a feature stressing Canon users...
Some of them, apparently.  ;)
Probably some of those who are still stuck to auto iso 400 with flash :-p ... if everybody else is fine with that they've got that certainly doesn't bother me.

I'm certainly struggling to get used to the flash settings.

But clearly it is possible to use flash at high ISO. Sometimes mine goes to 6400. And produces great reslts most of the time.

I'm not complaining as I suspect with my understanding of flash the camera is helping me.

I'm not one of those who will automatically assume that the camera is "crippled" or "broken" when it is restricted in some way. I start with the assumption that Canon know a lot more about making cameras than I do.

133
Animal Kingdom / Re: Show your Bird Portraits
« on: December 09, 2013, 04:38:02 PM »
Red-breasted Merganser drake...



Skillful photographer  + good lens = photo likes this

I can't wait to have something like this in my collection :)
+1

Me to, would love to have taken this.

134
Animal Kingdom / Re: Show your Bird Portraits
« on: December 09, 2013, 04:35:17 PM »
I've been trying to push myself to get something different.

Work in progress they say.  :-[

First couple, flash was clearly not right. before processing it was black. (I clearly need more DR,  ;D)

3rd one a moment late, it had folded its wings.

4th one was taken with the camera shown to the left of the 3rd shot.

The birds very obliging, now I just have to improve.





135
1D X Sample Images / Re: Any Thing shot with a 1Dx
« on: December 09, 2013, 04:25:36 PM »
I tried grabbing some still's from a video shot with the 1Dx in sunset low light.

and a single still that shows the set set color.


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