Erik Magnuson

Erik Magnuson

Lives in United States Cape Canaveral, FL, United States
Has a website at http://www.pbase.com/maderik
Joined on Dec 29, 2000
About me:

This is what I'd like to appear on my public 'posters (sic)
profile.'

Comments

Total: 241, showing: 61 – 80
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On Sony Alpha 7R Review preview (807 comments in total)
In reply to:

fabio riccardi: I have a question about lenses for full frame mirrorless cameras.
I notice that pretty much all the Sony lenses for these cameras have relatively small maximum aperture. The 55mm normal lens is 1.8, vs the 1.4 we are accustomed to for normal full frames. Similarly for the rest of the line. I guess that bright lenses also mean heavier, larger, lenses, which don't quite make sense on smaller camera bodies.
This kind of defeats the purpose of a full frame sensor, where you can benefit from the shallow depth of field it allows.
On APS sized sensors, brighter lenses can still be fairly compact. Fuji, Panasonic, and Olympus lenses are all much brighter than the new FF mirrorless Sony.
Brighter lenses on APS sensors deliver equivalent DOF and look than the dimmer lenses on FF. At the end what is gained with the full frame is lost with the smaller maximum practical aperture.
What do you guys think?
- Fabio

To be fair, the Zeiss is also T-1.8 while the other brands 1.4's are often darker than spec at T-1.6 or T-1.7. The real difference is much less than the f-numbers imply.

Direct link | Posted on Feb 13, 2014 at 20:47 UTC
On CP+ 2014: Hands-on with Sigma DP2 Quattro article (249 comments in total)
In reply to:

Jon Ragnarsson: I wonder if the is the same lens design as the Sigma 30mm f2.8 lens for NEX. Still no good photos of people holding this thing...

Different lens from the 30mm DN ART: 8 elements in 6 groups vs. 7 elements in 5 groups. Similar design for the back groups but different front groups (larger, more complex on dp lens).

Direct link | Posted on Feb 13, 2014 at 19:18 UTC
In reply to:

Brigcam: PENTAX Film Duplicator-

Anyone else make this?

Depends on how much it automates film handling. "Slide duplicator" attachments have been around since the 60's.

Direct link | Posted on Feb 5, 2014 at 23:56 UTC
On Using third-party lenses on Sony Cyber-shot a7 / a7R article (495 comments in total)
In reply to:

Zorak: Honestly, I don't understand. I am, by all mesures, a beginner. And I could use with ease my father's Olympus 50mm f1.8, and getting great results with it, be it with focus peaking when subject permits it, or magnification when the conditions are not ideals.

It's a 30€ lense, I'm far from being an expert, but I could get great results most of the time. So honestly, I know the ergonomics could be a bit better, but I don't understand all the mumble rumble about not being able to get focus. Sometimes it takes me a few seconds to be perfectly on focus, but I nail it. Everytime. So, how could you not ?

For the rest, maybe it's for my lack of understanding or technical knowledge, but A mode ? With a manual lense ? What ? Set it to M, auto-iso if you don't have time, set the auto-iso to limits you find acceptable (for me, 3200 iso on the A7), and there you go...

@Zorak "Honestly, I don't understand."

Read the article again. It's not about the quality of the results (except for the old 17mm), it's about the potential usage issues. If you are not in a hurry or shooting mostly static subjects, those issues are mild inconveniences. For more dynamic situations, the ergonomics could be improved.

You also do not understand the differences in focusing a 57mm f/1.2 lens vs. your 1.8. Compared to an old split-image prism or rangefinder, focus peaking is far more dependent on lens contrast so some of these older lenses do not focus as easily with the A7 as with the cameras they were designed for.

Direct link | Posted on Jan 22, 2014 at 16:21 UTC
On Using third-party lenses on Sony Cyber-shot a7 / a7R article (495 comments in total)
In reply to:

bobbarber: I don't know what to think. I'm a little surprised about the comments about the difficulty manual focusing. I'm a m43 shooter, but interested in this camera as a FF option. I find manual focus easy on m43 with a viewfinder model (currently the G6 for me), or at least a lot easier than it was with a DSLR. To me, having to move the focus point before magnifying it is a feature, not a bug. Take the example in the text of the difficulty of trying to focus on a model's eye. Imagine how hard it would be if your focus always defaulted to the center of the frame, and then you had to recompose the picture after focusing, with only a centimeter or so of DOF to work with. Having not tried this camera, I'll trust the review. Maybe there is something poor in Sony's viewfinder or ergonomics that I'm not aware of yet.

You are not trying to focus a 9mm f/1.7 or 28mm f/0.6 or 17mm f/1.0 or 25mm f/1.0 lenses. These are the MFT equivalents for DOF and thus focus accuracy. Add in that some of these are older single coated lenses with very low contrast wide open. The article says the issue gets better once stopped down to more MFT like DOF.

Direct link | Posted on Jan 22, 2014 at 04:54 UTC
On Sigma announces all-new 50mm F1.4 DG HSM 'Art' lens article (245 comments in total)
In reply to:

eaa: Min. aperture F16?
That is not normal for an FF lens, where F22 or 32 are the norm.
Why a min aperture even below the diffraction limit?
Must be a typo (like the initially wrong weight (85 gr), now corrected to 470 gr.

Normal is typically no more than 8 stops total, i.e. most faster than f/1.4 or better lenses only stop down to f/16.

Direct link | Posted on Jan 6, 2014 at 23:03 UTC
In reply to:

JEROME NOLAS: What is SONY? A car maker? Thanks God they don't make aircrafts!

The sensor pixel structure is the same, but it's possible the toppings are different (microlenses, color filters, IR filter, how no AA filter is implemented, etc.) The post sensor electronics are different and yes, this impacts raw. It also could simply be an artifact of the testing chain where dcraw is converting the Sony files with higher contrast.

Direct link | Posted on Dec 17, 2013 at 15:02 UTC
On DPReview Gear of the Year: Canon Rebel SL1 / EOS 100D article (271 comments in total)
In reply to:

Daniel Lauring: Great for Canon shooters, but unfortunately, Canon's APS-C doesn't perform any better than the best m43 so that is a better choice for someone that wants to pack small...body and lenses. Now if this was a Nikon with a Sony sensor....

@Andy Crowe - then it's a good thing that the SL1 has a display capable of all of those things in addition to an OVF - it's win-win.

Direct link | Posted on Dec 11, 2013 at 15:16 UTC
On Canon announces EOS M2 in Japan article (615 comments in total)
In reply to:

happypoppeye: Well, the one major item wrong with the M1 was the autofocus so lets hope Canon got that right this time. Not sure what they (as well as Nikon) are thinking but good job not cannibalizing your low end SLR sales and at least keeping the money from that cannibalization ...let the other companies get the money and cannabilize them instead.

@happypoppeye - you ask a marketing question and then say you are not interested in sales numbers? Way to demean your own post, e.g. "Don't give me facts, give me comforting lies that support my view".

Direct link | Posted on Dec 3, 2013 at 15:35 UTC

Much of the discussion seems to be on Nikon's motive for the change. Did Nikon simply improve the D5300's liveview focus capability (i.e. speed or smoothness) in a way compatible with Nikon OEM lenses? Or did they make an arbitrary change primarily to break Sigma lenses? How much responsibility does Nikon have to support all features of non-Nikon lenses? Should they spend development money testing every feature with every 3rd party lens? Just some lenses? Should they hold back improvements until 3rd parties upgrade all their products?

Direct link | Posted on Nov 19, 2013 at 16:40 UTC as 27th comment
On Canon EOS 70D Review preview (656 comments in total)
In reply to:

MisterBG: Conclusion - Cons:

"◾HDR mode unavailable if Raw is active (rather than disengaging Raw)"

Is there ANY camera that allows HDR raw shooting? (than than by multiple bracketed exposures).
HDR is an output image (jpg) function.
This can hardly be a "Con" since all cameras behave the same way.

Let's look at how other recent cameras do it:
* Nikon D7100 - HDR only in JPEG, disabled in raw
* Pentax K5-II - HDR only in JPEG, disabled in raw
* Sony NEX-6 - HDR only in JPEG, disabled in raw
* Olympus E-M5: no-in camera HDR
* Olympus E-M1 - HDR available in raw, raw files saves only the "normal" exposure

So yes, it is a strange con.

Direct link | Posted on Nov 1, 2013 at 14:57 UTC
On Canon EOS 70D Review preview (656 comments in total)
In reply to:

wakaba: So it sucks and sticking tailfins (WiFi and strange sensor) on that Olds is not going to make it better.

Canon is dead, check the data on dxo, 30-100% worse than a D600.

DxO tells you the best you can get with careful raw processing. But you need to map those numbers into visible results and factor in the raw processing you will do. I assume you have a gallery of images that are visibly better because you were able to exploit the sensor differences?

Direct link | Posted on Nov 1, 2013 at 14:46 UTC
On Canon EOS 70D Review preview (656 comments in total)
In reply to:

mpgxsvcd: I think Dpreview gives out more "Gold Stars" than a 60 year old Kindergarten teacher. Next they will probably start grading everyone on a 4 point system where no one ever gets a 1 or a 4 and you only get a 2 if you really screwed up in a major way.

You are assuming there is a meaningful differentiation that would universally apply to all DPR readers. Gold/Silver/stars/percentages are popular and they have exactly whatever meaning you wish to assign them.

Direct link | Posted on Oct 31, 2013 at 15:54 UTC
On Canon EOS 70D Review preview (656 comments in total)
In reply to:

tabloid: This Canon dual pixel sensor would be great in my Sony A65.
They were made for each other.

It's better than current contrast AF for lenses not designed for fast CDAF -- hich would include all A-mount lenses like those that fit the OP's A65.

Direct link | Posted on Oct 31, 2013 at 15:20 UTC
On Canon EOS 70D Review preview (656 comments in total)
In reply to:

Frederik Paul: Use Canon DPP for raw development and apply some chroma NR and the 70D gets closer to the D7100. But some people will never get this…

You see DPP artifacts if you pixel-peep at 100%. Do you see them if you print? You always have to ask why are you peeping.

Direct link | Posted on Oct 31, 2013 at 15:11 UTC
On Canon EOS 70D Review preview (656 comments in total)
In reply to:

Bjorn_L: Strange that DPR seems at odds with DXOs measurements. For example DR. DXO says it is poor, you say it is good. Are you or are you not partnered with DXO?

DXO's results say this sensor is about the same as the rather ancient 50d.

Canon Canon Canon
70d 60d 50d
overall 68 66 63
Color bit 22.5 22.2 21.8
DR evs 11.6 11.5 11.4
ISO 926 813 696

This is 0.7 bits more color detail, 0.2 Evs more DR and less then 1/3rd stop better in ISO.

Lagging well behind every current offering from Sony, Pentax and Nikon. Even the smaller sensor Olympus OM-D E-M1 and Panasonic GH3 best it in every category except ISO (where the Canon has a 1/7th to 1/5th stop advantage, which is fairly trivial compared to the difference between the 70d and its "same sized sensor" peers.

I am impressed by many details about the 70d and by the camera as a whole, but some of your comments are baffling.

DXO does not say the DR is "poor" - they say base ISO DR is lower than other models in the same price range. But by ISO 400 the difference is gone. In real world shooting, is the 70D "good?" If another camera is "better" do you know the visible difference?

Direct link | Posted on Oct 31, 2013 at 15:07 UTC
On Canon EOS 70D Review preview (656 comments in total)
In reply to:

mpgxsvcd: I think Dpreview gives out more "Gold Stars" than a 60 year old Kindergarten teacher. Next they will probably start grading everyone on a 4 point system where no one ever gets a 1 or a 4 and you only get a 2 if you really screwed up in a major way.

Yes, almost every recent camera is excellent. Why is this a problem?

Direct link | Posted on Oct 31, 2013 at 14:51 UTC
On Nikon D5300 preview (278 comments in total)
In reply to:

david vella: Why would anybody, with no brand loyalty or lens collection, looking for a new DSLR buy this plastic fantastic wonder in preference to a Pentax K3 for not a lot more money .
Compared to the competition's new round of releases , Nikon seem to be iterating the same old lackluster stuff. As usual Thom Hogan thinks otherwise and predicts the big two will fight back and wow us with something fantastic in the New Year . I have my doubts about Nikon delivering, judging by their recent past and questionable product decisions / marketing strategy.

Why? Because it uses Nikon lenses. Because you can find one in your local shop. Because the images will be just as good and it's cheaper.

Direct link | Posted on Oct 17, 2013 at 11:53 UTC
In reply to:

rikyxxx: Wow, 1/16000 silent shuter!!!

Isn't awkward that Sony and Panasonic, two companies w/o a "photographic history", try (and succeed) to innovate more than Canon, Nikon and Pentax?

Nikon has been offering a 1/16000 electronic speed on the 1 series for a couple of years now. The real issue is if it avoids the motion artifacts with current panasonic electronic shutter implementations.

Direct link | Posted on Oct 17, 2013 at 11:50 UTC
On Sony Alpha A7 / A7R preview (2372 comments in total)
In reply to:

GabrielZ: Wow! I'm gob-smacked by the difference in size between the Alpha and the 6D - that's really a tiny full-frame camera. Impressive!

An RF body design cannot replace the hump, only relocate or restyle it. Unless you think Sony left a large empty space somewhere in the body....

Direct link | Posted on Oct 16, 2013 at 18:14 UTC
Total: 241, showing: 61 – 80
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