Posts

jefflinde · Jan 7, 2015

Mika said:
Generally speaking, optics tend to work fine with downscaling. In the case of EF-M, yes that would indeed be possible. But the question is, does it make sense to do that? Occasionally, downscaling from full-frame's 43.2 mm image diagonal to 21.6 mm diagonal makes aberration correction (astigmatism and coma) easier by roughly a factor of four.

This tends to allow a reduction in the number of components in the objective, thus reduction in the price. So a designer might find himself in a situation that he can take away one lens from the formula without affecting anything much, or with only small performance degradations. Without a very good reason, this is often the case that happens.

For example, take a look at Sigma's 30/1.4 Art (DC=APS-C) and at Sigma's 35 50/1.4 Art (DG=FF) where the number of lenses is noticeably less in the 30 mm version. This did come with a slight compromise on the lens performance, though.

Does this answer your question?

EDIT: Oh, forgot to mention that upscaling an optical design doesn't work as nicely as typically the optical aberrations increase at least quadratically, so the general rule is down-scaling is OK, up-scaling isn't.

EDIT^2: Mika isn't paying attention today. Of course it should say 30/1.4 Art and 50/1.4 Art as we are talking about comparable FOV with scaling...

this does answer my question. thank you.

josephandrews222 · Jan 7, 2015

tpatana said:
Stop scaring me!

Had to try mine. It was almost dead on. However, using the 24-105, if I turned off the IS, then the AF point always shifted ~1/5 upwards. Strange. Did about 10 both ways, IS-ON was ok, IS-OFF was slightly up always.

Btw., what's the FW they installed? Wouldn't be the first time the service uses pre-release of something that's coming out in public some time later.

If's it's different than what we have, you need to go through all menus to check if you can find any changes.

...tried mine as well (using the viewfinder and center-point, and live-view and center-point)...and ended up having to google 'parallax view' (not the movie!).

My 5dMkIII is perfect using live-view LCD center-point focus, but depending on the position of my eye at the viewfinder I could induce a bit of parallax which caused just a bit of off-set in the downward and left-hand direction. I wear prescription lenses and I suspect this contributes to the problem, too.

So I think it is worth testing this AF Point Issue using the LCD and live-view before sending your body off to Canon.

mrzero · Jan 7, 2015

tyger11 said:
The f/4 Lenses of the Photocalypse!

The f/4 Horsemen of the Photocalypse?

TexPhoto · Jan 7, 2015

dickgrafixstop · Jan 7, 2015

Whatever's in front of you - or to the left or to the right. It's a marvelous area and the opportunities are boundless. If you want standard tourist shots, buy the postcards.

Synkka · Jan 7, 2015

Thinktank Streetwalker pro, I have the thinktank streetwalker harddrive great bag

wickidwombat · Jan 6, 2015

Khufu said:
wickidwombat said:

that looks nice!

any idea if you can get adapters to use EF-M lenses?
i could see this living attached to my 11-22...

Click to expand...

very much doubt it, buddy... the NX flange distance is greater than the EF-M mount!
Also, with all the wire-focusing/aperture control etc in these MILC systems I can't imagine we'll be seeing inter-system compatibility adapters in a hurry!

bummer but it will be interesting to see how this lens performs

Samsung S 11-24mm f/2.8 ED OIS

so far the indications of the IQ and the AF performance of the NX1 really make
me have a good hard look at this upcoming little brother

agierke · Jan 6, 2015

It could be a faulty on switch as well. I had the on switch start to fail on my 5dC. I could get it to power on only if i wiggled the switch in the on position. It will still power down if my face accidentally brushes the power switch when I'm shooting.

zlatko · Jan 6, 2015

Maiaibing said:
zlatko said:

the focus shift is so easy to avoid

Click to expand...

Great that you are happy with the lens. For the price I'm just not as forgiving.

Happy shooting!

Yes, I'm happy with the lens because it has an exceptionally beautiful way of drawing. It was good enough for Mario Sorrenti shooting the 2012 Pirelli Calendar (NSFW) -- https://www.youtube.com/watch?v=gjjF5yQmVw4 -- He used it along with the 24-70 and a Hasselblad. It's good enough for photojournalist David Burnett and others.

epsiloneri · Jan 6, 2015

Many thanks for your detailed answers!

wearle said:
4) Have you captured the same meteor in different cameras? I'm sure you have, I just couldn't see it easily by looking quickly.

Click to expand...

Yes, there are quite a few "repeat" meteors. The second and third composites are mostly repeats. The only difference is the time at which the background image was taken. The radiant was much higher in the third composite.

Another idea just occurred to me. I think it would be insanely cool to have a stereoscopic image of the meteors from a shower including the radiant. The cameras would have to be close to identical in setup and positioned about 10 km or more apart for good stereo effect. One day I am going to attempt it, perhaps enlisting a collaborator.

Tugela · Jan 6, 2015

SpartanII said:
Tugela said:

enraginangel said:

I have a 2012 model Vixia and it is an excellent camera even for today's standards. Unfortunately, that is pretty unacceptable for a 2015 model.

Click to expand...

Not really. Current "Excellent" video quality standards for consumer HD were set by the Sony RX10, which was announced in October 2013. Video from the Exmor sensor is outstanding, and has been successively improved by later cameras with the same sensor family. I have a RX100M3, and the quality of the video from it blows away that from my HF G30. The RX100 does not have a comparable lens of course but it does set the standard for the minimum anyone should be expecting from a video camera in 2015. The so called "new" R60/R62 will produce the same limited quality that Canon camcorders have been producing since at least 2012, and that simply is unacceptable.

Click to expand...

In fairness and comparing apples to apples, this would be a P/S cameras vs camcorders.

Am thinking that camera sensors in many cases best consumer hd camcorders especially those in the canon consumer vixia line. To your point, the specs of the HF G30 looks almost exactly like the consumer grade HF M and R lineup minus the audio bonuses.

Superficially the G30 has similar specs, but mechanically it is much better than the R series. It has a bigger sensor and a much better lens, it has an EFV, better controls etc etc. The G30 is the same camera as the XA20/XA25 however, just with a few less mechanical add-ons. In fact, it has the same innards as the XF200/XF205 as well (those have different shells and a few extra encoding options).

Marsu42 · Jan 6, 2015

Fyi: from from http://www.digitaltrends.com/photography/rumored-sony-light-field-camera-and-4k-canon-5d-mk-iv/ ...

... Sony filed a patent indicating they're looking into light field, too: http://www.freepatentsonline.com/y2014/0071244.html

kaihp · Jan 6, 2015

Mt Spokane Photography said:
Marsu42 said:

kaihp said:

Today I found that checking the two links does not work as usual, and as expected for me.

Click to expand...

Works for me as advertised, probably a bug in the software?

Personally, I keep being logged in ("remember me") so the "show unread posts since last visit" list is never lost unless I manually clear it after checking nothing interests me.

Click to expand...

+1.

It's likely something in your computer, clear the browsing history and try again.

I also keep being logged in, on 2-3 different computers and on my smartphone (all at the same time).

The forum software uses cookies to keep track of state (at least SMFCookie46 and PHPSESSID are used) and I would ass-u-me that any change in behaviour would be caused by change in forum SW rather than my browser (FF34). But then again, changed browser behaviour have caused server behaviour before...
Time to go back and test with an older FF version I guess.

Sporgon · Jan 6, 2015

Each to their own. If someone want a Fuji XT-1 so what ? It's a great little camera.

Regarding Luminous Landscape: well let me put it this way. Many of the best images posted on Canon Rumors leave LL in the dust.

And some of their recent articles have just been ???

zim · Jan 6, 2015

Re: Canon U.S.A. Announces Connect Station CS100: The Centerpiece That Unites Your Canon Imaging Dev

"Sure to be a hit at keys in the middle parties"

........ to put the keys on

Hjalmarg1 · Jan 6, 2015

Sabaki said:
Like the majority of us on this site, I tend to read something about photography on a daily basis and I try to absorb as much as possible.

One of the things that I've noted, is the popularity of the 24mm focal length.

It certainly is a focal length that is present in many different lenses and as I'm typing here, I can think of at least 8 lenses that have 24mm in it's range.

I have one lens which incorporates this focal length and that is my 24-70 mkii.

But I have a confession to make, I can't 'see' photography in 24mm and I think I'm losing out on what may be the most versatile focal length in digital photography. In fact, I would ask, is 24mm to digital photography what 35mm was to film?

What I mean by 'see' is that when I'm shooting with my 100mm macro or 400mm, I can envision what I want to capture and snap the shot.
I think a big reason for this is that I know what appeals to macro photography and bird/wildlife photography so I kinda have a feel for the 'psychology' of these focal lengths.

I am however stumped as to what I can do with the 24mm focal length.

Is it best as a people lens? What does it bring for landscapes? What other genres benefits from shooting at 24mm?

This may be somewhat of an odd question and I can imagine many wouldn't find this topic interesting but I fear I bought the 24-70 in a question to own the holy trinity but I never envisioned what to do with the lens.

I'm looking for that EUREKA moment where I get what this lens and specifically 24mm is about and will know instinctively to use this lens in a specific scenario.

Once again, I understand if this thread only returns a few replies (actually I'm hoping for just one ) but I'm looking to explore different aspects of photography this year as opposed to being fixated on gear talk and tech babble.

What do you guys 'see' when you reach for your 24mm? What do you expect from the final image?

I have two zoom lenses that cover this FL and I used it mostly for landscape and large group of people despite tha fact I found sometimes too much distortion at the borders.
I rather use the 35mm FL more often than the 24mm FL.

RGF · Jan 5, 2015

Hi

I just my 7D M2 and really like the option to have multiple My Menu tabs. It would be great if Canon would add these to their existing cameras (1Dx, 5D M3, 6D, 70D).

A couple of observations - I can not figure out how to turn of unused metering modes. I only used evaluative and spot, never use central weighted or ....

Also found that they focus was a bit soft with my 200-400. The camera arrived Wed and Thursday I took it on a family trip (mostly shake down). I did a bit of AFAIM (I think +7 at the long end of the lens), with my 1Dx I don't need a AFAIM on this lens.

I have not had time to test other lens on this camera yet.

jrista · Jan 5, 2015

Lee Jay said:
jrista said:

Lee Jay said:

jrista said:

Happy to help. It's just a hobby, really...well, a hobby that assists me in my other hobby, really. I like to know everything about what I do, so as a photographer, well, I had to know how sensors and lenses worked. So I researched it.

Click to expand...

Just wanted to point out that the lp/mm for each sensor posted way above are only correct if you have monochrome sensors with tiny pixels (low fill factor) without microlenses and without an AA filter. If you have a Bayer sensor with real pixels and an AA filter, you're going to need at least 2.5 and maybe closer to 3 pixels per line pair.

Click to expand...

If you actually read my post, I stated as much.

Click to expand...

You made a passing reference to this in a different post and then posted wrong numbers and proceeded to reference those wrong numbers. If you knew this, why not just use more correct numbers?

What wrong numbers? I stated that they assumed a monochrome sensor. Why did I assume monochrome, rather than something else? Because there are a lot of factors that greatly complicate "reality", and I preferred to keep things simple, as not everyone is a mathematician or an engineer. It's easy enough to approximate after the fact to account for other blurring factors. You may care that everything is 100% perfectly exact...most people don't. And when my goal is just to get across the concept, absolute exactitude doesn't matter.

BTW, I did not make a passing reference to the fact that I assumed mono in another post. I made a direct reference in the post I made in this thread:

jrista said:
Real-world resolution can differ a bit when you factor in bayer interpolation, low pass filters, bayer array layout, etc.

dpc · Jan 5, 2015

Sorry, only three seasons. Not the same perspective, but at least the same location.

Sporgon · Jan 5, 2015

Marine03 said:
Thanks for the help guys problem fixed. I had no idea the AF sensor was so small in the bottom of the camera I had previously been blowing air at the screen up top. But once I used the air down loan at the sensor my focus points started working again. I was | | close to sending it in to canon for repair.

Yes, dust on the AF array is the usual problem, but something that no one really seems to take seriously, or even be aware of.

gregorywood · Jan 5, 2015

YuengLinger said:
Pride goeth before the fall.

Deep breath.

Go take photos. Drink wine. Consider current blessings.

Repeat.

Happy holidays!

I like this advice...especially the part about wine.

Greg

Marsu42 · Jan 5, 2015

GMCPhotographics said:
Everyone seems to forget that the Canon 50mm f1.8 has beautiful bokeh when shot wide open. It's got a circular "straight though" light path. The only issues occur when it's stopped down and the low number of straight edged aperture blades comes into play.

Good point, but of course this severely limits you in your creativity as you essentially are fixed to the "native" depth of field of the camera. And you're hit for six in bright light when your shutter is maxed out unless you use a nd filter. I often used to use my 50/1.8 stopped down since the sharpness is really mediocre wide open on ~20mp digital.

GMCPhotographics · Jan 5, 2015

Re: Canon EF 100-400 f/4.5-5.6L IS II & EF 400 f/4 DO IS II To Begin Shipping This Week

balvert said:
My wife and I are both into wildlife and bird photography. She keeps taking my EF400 f/5.6L and I and up using my EF 70-300L. I have been debating whether to buy another EF400 f/5.6 or the new 100-400 Zoom. I really like the EF400 f/5.6 however I was hesitant to buy a duplicate lens. Also the EF400 has a long minimum focus. Finally pulled the trigger on the new zoom this morning due to IS, shorter minimum focus and versatility. If it is as sharp as the 400 I will be a happy camper. Just hope that Adorama doesn't surprise me with a back order.

The only area two areas the prime can excel in over the new zoom is a slightly longer focal length. The prime has a real world 400mm against the zooms real world 380mm. And lightness. The prime is a lot lighter in weight and the zoom. Most users of the zoom will be racking out to the long end anyhow, so the improved AF speed should match the prime. The new IS will be a nice feature, but not so useful for Birds in Flight. The improved Min Focus distance will be nice for close up portraits of birds and the like (which I currently do with a 70-200 f2.8 LIS II and a tele converter). Only you can say if these features are worth the cost of replacement.

GMCPhotographics · Jan 5, 2015

beckstoy said:
Hjalmarg1 said:

ahsanford said:

Oh snap. Ultrawiders who really want 14mm on a zoom might be happy to see this rumor...

http://photorumors.com/2014/08/14/sigma-lenses-rumored-for-photokina-24mm-f1-4-art-and-14-24mm-f4-with-os/

...but I think someone will complain about not having f/2.8 before anyone can say woohoo to a 14-24 lens.

- A

Click to expand...

I am more interested in seeing the 135mm f/1.8 DG OS, 85mm f/1.4 DG and 24mm f/1.4 DG Art lenses. These will have an enormous impact on Canon (and also Nikon).
I had the curren Sigma 85mm f/1.4 and only sold it because I needed money and haven't purchased it again waiting to see if Sigma refresh it. Hopefully, the 135mm and 24mm will be priced well below Canon ones.

Click to expand...

I love Sigma's Art lenses. I'm with you on these two, although I'd prefer seeing the 85/1.4 come out first simply because the very good Canon 135 is pretty inexpensive. I'd sell my Canon copy if the Sigma Art lens is good, however.

The only other amazing 85 is Canon's, and that's $2100. Unngh...

Yes, from my long experience with Sigma...quality control and focusing accuracy is a lottery.

GMCPhotographics · Jan 5, 2015

Mt Spokane Photography said:
Its interesting to compare the lens at 400mm on the 7D MK II wide open at f/5.6 versus wide open on a 1Ds MK III with 1.4X TC. Note, the lens is better wide open than stopped down, and matches the FF in the corner, but not quite in the center when wide open.

The images are very carefully set up and manually focused to be the best the camera can do. The 7D MK II is a hair better than the 60D, since it has a few more MP, the improvement is proportional.

I wish he had included the 1D MK IV in those tests.

7D MK II at 400mm f/5.6 (center)

7D MK II at 400mm f/5.6 (corner)

1DS MK III with 1.4X TC wide open - f/8 (center)

1DS MK III with 1.4X TC wide open - f/8 (corner)

This will make zero noticeable difference in real world photos unless you are shooting lens charts in a lab.
I'm pretty confident in saying both the new 100-400L and the 7DII will sell very well for Canon and for good reason.

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