Posts

Zeidora · Dec 1, 2017

Alejandro said:
Zeidora said:

malus said:

@zeidora: I seem to understand form your comments that you are proper microscopist but I don't want to bother other readers with technical stuff.
I am interested in monitoring crystals during solid-state reactions. In some case these occur by varying temperature, in other cases by exposing crystals to humidity, pressure, or different gasses including HCl and ammonia, through the use of special cells that I have designed. Now for some reason people don't want me to use HCl in their ESEM :-X.
Being more serious most of these reactions produce a change of the crystal colour that electron microscopy cannot reveal.

Anyway if as you shouw above the lens resolution is the limiting factor then the test results of DoX mark suggest that I'm better off with a 6D or 5D and an extender than the 5DS(r).

Click to expand...

Yep, no HCl in "my" SEM either! I only brought up SEM because you mentioned TEM. Still waiting for the color SEM as well.

Re 5D vs 5Ds[R], does not matter really. Either you use the 5DsR and get low mag, high MP image, or you use 5D ... and get higher mag, lower MP image. The structure will be shown at the same pixel dimensions at the edge of resolution, once you factor in absolute pixel size.

Click to expand...

So, you're saying that in between a 5DsR and a 5D2/5D are the limits, ¿any camera in between (6D, 6D2, 5D4) would just balance the quality/diffraction/magnification?

precisely. Optical resolution is measured of how small an object structure (two points/lines separated between x µm) can be recognized as distinct. There is the contrast issue added in and that is what MTF tells you. Keeping object contrast the same, then either you can use a low overall magnification (say 4:1) on a high MP body with small pixels (say 5DsR), or you can use an overall higher magnification (say 7:1) on a lower MP body with larger pixels (say 5D2) to reach the resolution limit of the lens. Going above 4:1 on a 5DsR is futile, because you only blur circles over many pixels, but not additional information. That is what the beginning of this thread was all about.

With crop bodies, the small pixel size vs small sensor size sort of cancel each other out.

The above is not fully mathematically exact, but gets us into the ball park, and we can avoid doing futile exercises (e.g., going to 10:1 with MPE65 & 2xTC on 5DsR).

That is why I suggested microscope objectives for your 0.5 mm crystals to begin with.

Canon Rumors · Dec 1, 2017

HTML:

<p>Canon has updated the firmware for the EOS-1D X.</p>
<p><strong>Changes in the Firmware</strong>

Firmware Version 2.1.0 incorporates the following improvement and fixes:</p>

<ol>
<li>Fixes a phenomenon in which standard exposure may not be obtained, or an irregular exposure may result, when Silent LV (Live View) shooting with the following TS-E lenses: TS-E 50mm f/2.8L MACRO, TS-E 90mm f/2.8L MACRO, or TS-E 135mm f/4L MACRO.</li>
<li>Changes the maximum number of “Release cycles” displayed from 1,000,000 cycles to 9,999,000 cycles. This value can be checked under the “Camera system information” menu.</li>
<li>Fixes a phenomenon in which a synchronization failure may occur during multiple flash shooting.</li>
<li>Fixes a phenomenon in which Error 80 occurs depending on the shutter release timing.</li>
</ol>
<p><strong><a href="https://www.usa.canon.com/internet/portal/us/home/support/details/cameras/dslr/eos-1d-x?subtab=downloads-firmware#Z7_MQH8HIC0L88RB0AMD0F1Q42K25">Download firmware 2.1.0 for the EOS-1D X</a></strong></p>
<span id="pty_trigger"></span>

Patlezinc · Dec 1, 2017

Hi everyone.

I just bought a 5d IV and I have an issue with my 35mm.

I have calibrated the focus lens with the usb dock. That is ok.

But I have a problem in live view.
When I do the focus in live view, if i focus with a non-centered zone, for far objects (More than 1 meter), focus is blur.

I have disabled all corrections.

I thought it was impossible to miss a focus with live view...

Two more infos :

- my Canon 24-70 F4 at 35mm is working perfectly with the 5D
- the 35mm is working perfectly with the live view on the Canon 6D.

So the lens is ok i think, but not with the 5D.

The question is : can someone try to focus a far object with the live view on his 5D4, on the right or on the left with a 35mm ART?

Thanks.

Here an exemple :

Auto focus (impossible to do the focus) :

AA12D5BE-0938-4489-A5E2-942F96C0920C.20171128155018.jpeg

Manual focus:

0CB688CF-3926-4467-922D-BE1DC73700D6.20171128155330.jpeg

jeffa4444 · Dec 1, 2017

TowerJazz bought Panasonic CMOS wafer plants (it was billed as a JV) and with it access to Panasonic back side illuminated sensor tech. TowerJazz has in-house designs and acts as foundry for companies like CMOSIS who design Leica sensors and others of their type and maybe Nikon has an in-house design team and TowerJazz is the foundry.

Sony control the largest % of the global CMOS sensor market and majorly through organic growth (they did purchase a Toshiba wafer plant) and through their own innovation & patents. Omnivision is a large sensor manufacturer but don't really produce sensors for Photography unless you consider smartphones.

Growing steadily are Hynix and Himax as well as a couple of Chinese manufacturers.

It would be a big move for Nikon to move away from Sony as a supplier but given they are competing in the same space not surprising either.

chrysoberyl · Dec 1, 2017

SkynetTX said:
The specified MFD of the lens is 13 cm only. It means that the MWD is about 3-5 cm. In my opinion it's a way too short for any subject alive. For static subjects and flowers can be acceptable. Theoretically it supports extension tubes but if you try to add a 25 mm one to achieve 1.91x magnification the subject will go inside the lens.

Hmm...good point. And the Laowa 60mm 2X has a MFD of 6 cm, so I am back to considering the MP-E. Thanks.

hne · Dec 1, 2017

For a mechanical engineering description of the source of and countermeasures to this "clearance", have a look at https://en.wikipedia.org/wiki/Backlash_(engineering).

hne · Dec 1, 2017

johnhenry said:
I have a 200mm 1.8 use and what to incorporate CA, light falloff etc correction data the camera can fix this before it arrives at my work station.

How would I go about doing this?

The Canon Lens Registration Tool does not support that lens. Your only option is to apply a lens profile on the raw file as part of your post processing.

chrysoberyl · Dec 1, 2017

Laowa 25mm f/2.8 2.5-5x Macro lens

Has anyone heard about availability and IQ?

Viggo · Dec 1, 2017

SRSW said:
The price would be the deciding factor for me personally - does the price gap warrant that much of a image and build quality difference?

If weather sealing and IS means nothing to you and you’re okay with potential AF/copy issues the Sigma will be a good choice. If you value size weight, IS and sealing then the 85 IS might be the right way to go.

I’m really happy with the 85 IS even though it’s a bit far from my 35 L II in image quality.

LSXPhotog · Nov 30, 2017

I invested into the M system this October during their massive refurbished sale. I'm extremely pleased that I went with the M5, as it's a great travel camera. The 15-45 lens is ultra compact and light, which is great news, but the aperture is slow - I get the compromise. My biggest reason for buying this lens was it's 24mm equivalent FOV. It's my favorite wide angle focal length. My plan is to swap to the 22mm f/2, adapted 50mm STM (looks very cool mounted) and a manual 35mm lens for low light stuff. So if this lens comes out...I may be first in line to get it! An f/1.8 or f/2 15mm would be sick. However, I'd take another pancake lens too. The 22mm is lovely.

bwud · Nov 30, 2017

Besisika said:
I think we need someone who uses it on a daily basis to explain it more in detail so that we could understand more.

It finds a face, then with the found face it attempts to focus on the closest eye.

Besisika said:
Eye focus sounds great, but how is it different from the Canon face detection in LV?

In my limited experience with face detection (on the 5D iii), I found it tends to find a face and then focus on the closest part, i.e. the nose.

Nov 30, 2017

Has anyone ordered and received a Sony a7r3 and been able to compare it with the 5dmk4 or 5dsr?

I've had mine for about a week but the adapter only arrived a day or so ago so haven't been able to do anything more than play with it in the backyard, cats and insects so far.

Coming from a 6d (which I'll tell until it completely dies) and an often borrowed 5dmk3, it's a huge improvement, but I'm quite aware that they're also very different price points/levels so would be interested how others are finding it.

Downsides so far are mostly user error, adjusting to differing af modes etc. And the battery life, not as strong as the 6d when you leave it on constantly, but plenty for a good shooting session overall

geekpower · Nov 30, 2017

looking at these images i am very conflicted. there is a lot to like about this lens, including the price, but the bokeh clipping looks really horrendous to me. i don't mind the cat's eye bokeh balls so much, because there is actually some creative potential there, but the nervousness it creates in the background of the shots with trees i find quite distracting from the subject.

the 135/2 IS ought to be better for clipping, yes?

mb66energy · Nov 30, 2017

midluk said:
mb66energy said:

neuroanatomist said:

lightthief said:

An other reasen could be the effect "focus breathing". The focal lenght is defined for focusing to a distant point. At mfd, some lenses seems to be shorter...
At least that is how i understood it.

Click to expand...

That seems a likely explanation. The lenses were focused on the near water lily, less than 2 m away.

Click to expand...

They have obviously different focal lengths: The 1.8 85mm has a slightly longer FL because it has slightly less field of view - it is much more confusing that the out of focus CoCs are smaller at the same f-stop ...

Click to expand...

Assuming the f-stops are correct for infinity focus (even that is likely not always the case; perhaps it is actually f/1.95 in this case and canon rounded that down to f/1.8) and the absolute aperture does not change with focusing, the f-stop will also change with a change of the focal length.

Good idea! But if I just measure the diameter of the circles of confusion for both lenses at f/1.8 and calculate the relative area of these circles I see a difference of a factor 2 (in words TWO) - this is a whole f-stop so the EF 85 1.8 would show f/2.5 at the focus distance of 2m - not very plausible because 2m is ~ 25 times the focal length ...

The circle of confusion ratio between both images of the EF 85 1.2 are consistent with the f-stop numbers.

Some quick shots comparing EF 100 2.0 and EF 100 2.8 macro at the same f-stop settings show very similar circle of confusion sizes while beeing very different in optical construction at ~ 1m distance ...

But maybe this is the regime between pure optics and lens magics which needs 20 years of daily experience to be understood.

magarity · Nov 30, 2017

I got the email about this update being available last night. Unfortunately Canon neglected to attach one of said lenses to the notice

picturefan · Nov 30, 2017

...crazy, isn´t it?

If I could be more sure, I would buy a used one - without hesitation.
Don´t wanna change the lens more than 10 times

sanjosedave · Nov 30, 2017

What has been your experience using the Canon PowerShot SX620 HS?

Could you post some images, especially at the long end? Thx

Hector1970 · Nov 30, 2017

Nice to see a APS-C sensor on a company act camera.
A pity the lens is so slow.
For the price it should be a wow camera.
It’s just a meh! camera.
Sony do a much better job in this segment.
I know people want 4K video but what will they do with it.
Most people don’t have laptops that can process it.
HD is really sufficient unless you are a moviemaker.
Not sure who buys these nowadays.
It used to be a good backup camera but it’s not the best available.
Maybe they still sell well.

Valvebounce · Nov 29, 2017

Hi Mt Spokane.
Thanks for that, that is the same thing by a different name (two nations divided by a common language

) that is what they describe it is for too.
I like the idea of the pre stretched silicon tube, but man you were not kidding at expensive! Wow!!
I bet that production cost works out something like 10% for the sleeve, 90% for the mandrel and then the profit margin on top (which I do not begrudge any business)!

Cheers, Graham.

Mt Spokane Photography said:
Valvebounce said:

Hi Mt Spokane.
Thanks for that idea, I think I have some of that if self amalgamating tape is the same, often used here for added protection on the F type coax connection to satellite LNB units.

Cheers, Graham.

Mt Spokane Photography said:

Self adhering silicone tape will work, its very durable and conforms nicely.

Here is a example

https://www.amazon.com/gp/offer-listing/B01NAPC4J7/ref=dp_olp_new_mbc?ie=UTF8&condition=new

Click to expand...

Click to expand...

I first came across it when designing a kit to repair wiring without using a heat gun to heat shrink sleeving back in the 1980's. Aircraft and Missiles That have fuel in them are unsafe for those high temp heat guns that are used for heat shrink. The tape can do a pretty good job of moisture sealing. There is also a stretchable 3M silicone sleeve which is wonderful and does not need tape.

expensive though.

https://www.amazon.com/3M-80610927677-Cold-Shrink-Insulator/dp/B004RGTICY

ahsanford · Nov 28, 2017

unfocused said:
Setting up a new 5DIV and I was reminded of one 1DX feature that I really hope is incorporated into the 7DIII: "Save settings to card."

I know nothing is free, but I can't imagine this would be that costly to implement and it would be one more feature that would set make the 7D series more like a mini 1DX.

As would spot metering at the selected AF point. If only we'd get that cell phone / Nikon D5500 level technology in the next 5D. :

- A

Ozarker · Nov 28, 2017

ahsanford said:
Ryananthony said:

600/4 and come back with some photos for the bird portrait thread. ;D

But, please share some of the photos with the 85. There doesn't seem to be much online hype about this lens and Id love to see more samples.

Click to expand...

I've seen some nice samples elsewhere here at CR:

www.canonrumors.com/forum/index.php?topic=33869.msg696463#msg696463

- A

Those are nice photos. The mirror box butchering the bokeh balls looks a little strange to me. I don't think I have a lens that does that. It puts me off a little. On the other hand, not every photo has those bokeh balls.

ahsanford · Nov 28, 2017

As a home storage solution, I have no desire for a Pelican as my gear is in a modified/divided metal DVD storage cabinet (see prior link from my post above). It's way too heavy to quickly steal en masse in the event of a break in, and it's expandable for my growing gear collection. It also gives me a good task height top work surface to pack my bag with one drawer open / service my gear on top, something you can't do with a Pelican.

<weirdgearprojectdaydream>

That said, I have had a desire to get the great landscape gear solution. Could be a bag or a hard case, but uniquely for this application I'd want to get my gear solely from the top like it were a tacklebox, old clamshell doctor's bag, etc. and it would ideally impervious to the elements on the opposite side of the opening. Most bags don't fit that form factor / top opening requirement, and generally require putting one side down on the ground in the muck and sand and moisture, which then has me bring a small tarp (actually a single person camping tent 'floor') to protect it. So I've been wondering if a hard case just for landscape work would do, but then I wonder about portage to the shooting location (wheels won't exactly cut it on a wet beach).

I may just be insane to want a single 'go bag' for all landscape work when I should simply use different bags for different types of landscape jobs. I could get hard case for car camping and city landscapes, use my GuraGear Kiboko if a decent walk or lighter hike is required, or use my LowePro Flipside Sport if it's a proper taxing hike.

But it would be sweet to have just one tacklebox dialed in for landscape sized items that always force me to do rearrange my bag dividers (my 4x6 / 4x4 filters and holder in particular, but also my Gitzo Traveler, which could fit inside a case if properly sized).

</weirdgearprojectdaydream>

- A

Hector1970 · Nov 28, 2017

I’ve used it mainly for Astro and Landscape.
For Astro it’s been manual focus. I’m really happy with it. Very impressive results. I have a Samyang 14mm 2.8.
I used it as well for landscape and it autofocussed perfectly and is very sharp. It would have been stopped down a bit.
I don’t use it for anything else. 14mm is wide I wouldn’t have thought of using it for a concert.
I’d highly recommend it. Not being able to use front filters is a negative and it’s expensive.
It was brilliant for shooting Aurora. It had the stars and the Aurora.

Hector1970 · Nov 28, 2017

The market data is a lagging indicator.
DP reviews galleries may not be a great leading indicator but it is interesting that no Canon camera or lens is in the top 10.
Canon is under no great current threat but market leadership can ebb away if the don’t keep producing good camera and lens. Canon seems to do incremental improvements in a low risk manner. The basic quality is excellent.
The problem I see for Canon is how they convince their current owners to keep buying new kit.
It’s not been compelling on the camera front.
Past sales are nice as they give you a customer base. It’s future sales Canon has to get to survive.
They need to do a good job on their first full frame mirrorless.
It offers the best hope for higher frame rate.

Mt Spokane Photography · Nov 27, 2017

The article is about still cameras that can be used for video, don't read something into it that's not there.

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