mpgxsvcd

mpgxsvcd

Lives in United States USA, NC, United States
Works as a Jack of all Trades
Joined on May 17, 2004

Comments

Total: 1769, showing: 1 – 20
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In reply to:

mpgxsvcd: While I agree that there is an issue with these cameras I cringe at the fact that some people think that shooting at F32 is an essential aspect to their A-PSC photography. The earliest reports were only reporting that it was an issue at focal ratios past F20.

I suspect that most people shooting at Focal Ratios that high on a regular basis with an A-PSC camera have no clue what the depth of field actually is at that focal ratio. In addition I bet they have no clue what focal ratio yields the greatest detail across the entire frame for their particular lenses. I guarantee F32 is not the most detailed focal ratio.

This probably is the first time I have ever been accused of being a “Canon Apologist”. Nothing could be further from the truth.

There is a definitely an issue with this camera. However, I wouldn’t have an issue with this defect in the majority of cases simply because I don’t stop down that excessively. That was my only point.

Direct link | Posted on May 6, 2015 at 15:33 UTC
On Canon EOS 5DS R added to studio test scene comparison article (70 comments in total)

The cameras of today are SOOOO much better than the cameras of yesterday and yet we complain much more. Personally, this new Canon is the first full frame camera since the 5D MKII that I would consider buying.

Once the price drops I will definitely see if its features are still competitive against cameras available then. However, I will say that this new camera finally has some innovation from Canon that I hadn’t really seen since the 5D MK II. Hopefully, they continue to do this.

Direct link | Posted on May 6, 2015 at 14:27 UTC as 8th comment
In reply to:

mpgxsvcd: While I agree that there is an issue with these cameras I cringe at the fact that some people think that shooting at F32 is an essential aspect to their A-PSC photography. The earliest reports were only reporting that it was an issue at focal ratios past F20.

I suspect that most people shooting at Focal Ratios that high on a regular basis with an A-PSC camera have no clue what the depth of field actually is at that focal ratio. In addition I bet they have no clue what focal ratio yields the greatest detail across the entire frame for their particular lenses. I guarantee F32 is not the most detailed focal ratio.

@ Azurael

They put it in there because people would revolt if it didn’t do it. All I ask is that everyone run through the calculations of depth of field just once when they stop down excessively to determine if it really was warranted to stop down that much.

I bet that in the majority of non-macro cases you would have had plenty of depth of field and much better detail at a wider aperture with an A-PSC or smaller sensor.

I am not saying don’t ever stop down. I am simply saying don’t guess at what your depth of field is. Just calculate it once and see if it really is prudent in that situation. Far too many people stop down the max the camera and lens will allow and say that it is necessary for depth of field when in most cases it simply isn’t and all they are doing is hurting detail because of diffraction.

Direct link | Posted on May 6, 2015 at 13:43 UTC
On Canon EOS 5DS R added to studio test scene comparison article (70 comments in total)

Looks good. I just wish we didn't have to wait a quarter of a year between when it was announced and when it actually hits the shelves. That and I wish it was about 3/4 the price.

Direct link | Posted on May 6, 2015 at 13:35 UTC as 18th comment | 1 reply
In reply to:

mpgxsvcd: While I agree that there is an issue with these cameras I cringe at the fact that some people think that shooting at F32 is an essential aspect to their A-PSC photography. The earliest reports were only reporting that it was an issue at focal ratios past F20.

I suspect that most people shooting at Focal Ratios that high on a regular basis with an A-PSC camera have no clue what the depth of field actually is at that focal ratio. In addition I bet they have no clue what focal ratio yields the greatest detail across the entire frame for their particular lenses. I guarantee F32 is not the most detailed focal ratio.

Too many people stop down excessively saying that the depth of field is too shallow if they don’t do that. For A-PSC cameras the depth of field is very broad at F22 and beyond with any of the wider lenses.

For example a 25mm lens with A-PSC has a Hyperfocal distance of only 4.85 feet. Unless you are doing macro there is no reason to stop down that much.

Direct link | Posted on May 4, 2015 at 21:53 UTC

While I agree that there is an issue with these cameras I cringe at the fact that some people think that shooting at F32 is an essential aspect to their A-PSC photography. The earliest reports were only reporting that it was an issue at focal ratios past F20.

I suspect that most people shooting at Focal Ratios that high on a regular basis with an A-PSC camera have no clue what the depth of field actually is at that focal ratio. In addition I bet they have no clue what focal ratio yields the greatest detail across the entire frame for their particular lenses. I guarantee F32 is not the most detailed focal ratio.

Direct link | Posted on May 4, 2015 at 21:19 UTC as 4th comment | 9 replies
In reply to:

mpgxsvcd: I agree with everything you said for short exposure photography but what about long exposure photography like astrophotography(Several minutes or more)? There longer exposures increases the electrical read noise and decreases the shot noise because the signal is more consistent over the longer period of time.

It would be interesting to find the shutter duration at which shot noise is surpassed by electrical read noise in particular cameras.

In addition stacking light exposures along with dark frames can reduce the shot and read noise by using some form of averaging with multiple frames. Since the noise is random the difference between each frame is the “unwanted signal”.

I bet the astrophotography audience is bigger on Dpreview than the ENG audience. Just say'n. If you really want to expand your readership in new directions that would be the direction to go in.

Direct link | Posted on May 2, 2015 at 03:52 UTC
On Let me try to address that... article (40 comments in total)

Shot noise was what I was missing before. I couldn't understand your conclusion in previous articles because I didn't believe shot noise was as significant as it actually is.

Now i see how much shot noise contributes with these samples and what you are saying becomes much clearer or noisier depending on how you look at it.

Thanks again for these wonderful articles. They are really well written and obviously full of Rishi's technical knowledge. They is a truly a great pairing.

Please keep posting articles like this and the review videos. That has really increased the value of reading Dpreview over the last few months.

Direct link | Posted on May 2, 2015 at 03:50 UTC as 14th comment | 1 reply

I normally would pile on Canon but that isn't appropriate in this situation. This is truly an unfortunate thing that they let happen. This is the type of thing that can really delay sales. It won't kill them(Right now) or anything like that.

However, it is just another thing that they will have to try to overcome. Honestly, I hope it doesn't hurt their sales too much. I think competition is good. I don't want to see Canon fail. I just simply want to see them succeed because they make a superior product to their competitors. I am not convinced that they are doing that right now.

Direct link | Posted on May 1, 2015 at 15:45 UTC as 51st comment | 1 reply
In reply to:

SteB: As I've tried to explain on the forum, this is very uniform distribution, which is the opposite of random distribution.
http://en.wikipedia.org/wiki/Randomness

If this was just random dust it would not be distributed like this. It could be dust trapped in the sandwich covering the sensor, but there would have to be something in the manufacturing process causing it to be evenly distributed. This is why I'm guessing a fault in the manufacturing process, for it to cause this uniform distribution.

Anyone who has studied distribution, randomness, statistics and probability in depth, will be aware that it is very unlikely that such a uniform distribution like this would be caused by a random fault like dust falling onto something. It could be dust again, but it would be dust formed by part of a process.

I'm fairly certain this will be fixed, once they discover what part of the manufacturing process is causing it.

@Rishi

Hey "Pot" have you met "Kettle". He needs a little polishing as well. :)

Direct link | Posted on May 1, 2015 at 15:40 UTC

That is a shame. I really was looking forward to seeing what the new HDR video mode was like. I am sure Canon will correct the issue. However, this is probably going to delay the release of the camera even further.

I followed the first reports of the issue in the forums and it did appear to be a significant issue. Hopefully it doesn't cause to big of an issue for the camera's release.

Direct link | Posted on May 1, 2015 at 15:35 UTC as 53rd comment | 2 replies
In reply to:

mpgxsvcd: If my scene doesn’t have any highlights that are blown at the normal/auto exposure value then is it possible that I would actually have to increase the exposure compensation in order to ETTR? In other words are there ever times when ETTR doesn’t involve decreasing the exposure compensation and is it still recommended to ETTR in those scenarios?

Then Auto ETTR will become the next Megapixel war in the future. Except for this time it will actually bring real benefit to the photographs and videos.

Direct link | Posted on Apr 29, 2015 at 20:44 UTC
On GoPro announces Kolor acquisition article (44 comments in total)
In reply to:

mpgxsvcd: GoPros 4K footage almost looks like 1080p. Not quite though.

Youtube actually does an excellent job with 4K now. You just have to encode it properly. Too many people apply too much compression when they edit their videos. It really needs to be compressed efficiently and then it will look great even on youtube.

Direct link | Posted on Apr 29, 2015 at 20:41 UTC
On Massive $33,500 2450mm f/8 NASA lens surfaces on eBay article (226 comments in total)
In reply to:

mpgxsvcd: Just for reference a High End 800mm Aperture telescope with a 3040mm Focal length and F3.8 focal ratio runs about $220,000. However, you can get a nice 2800mm F10.0 11” SCT with a very nice mount and a warranty for $6999. You would have to be a fool to buy this telescope as anything but a collectible.

http://www.optcorp.com/officina-stellare-rifast-800-f3pt8-telescope-rifa800.html

http://www.optcorp.com/celestron-cge-pro-1100-telescope-11087.html

@mick232

Yes all of these telescopes and even much less expensive ones will cover a full frame sensor. If you need bigger coverage then there are some specialty scopes that you can get that wouldn't cost as much.

Direct link | Posted on Apr 29, 2015 at 18:13 UTC
On GoPro announces Kolor acquisition article (44 comments in total)

GoPros 4K footage almost looks like 1080p. Not quite though.

Direct link | Posted on Apr 29, 2015 at 18:04 UTC as 15th comment | 4 replies

If my scene doesn’t have any highlights that are blown at the normal/auto exposure value then is it possible that I would actually have to increase the exposure compensation in order to ETTR? In other words are there ever times when ETTR doesn’t involve decreasing the exposure compensation and is it still recommended to ETTR in those scenarios?

Direct link | Posted on Apr 29, 2015 at 15:58 UTC as 42nd comment | 3 replies
On Massive $33,500 2450mm f/8 NASA lens surfaces on eBay article (226 comments in total)
In reply to:

Erick L: Keeping my money for the Hubble auction.

Shipping is going to be very costly on that one.

Direct link | Posted on Apr 29, 2015 at 15:27 UTC
On Massive $33,500 2450mm f/8 NASA lens surfaces on eBay article (226 comments in total)

Just for reference a High End 800mm Aperture telescope with a 3040mm Focal length and F3.8 focal ratio runs about $220,000. However, you can get a nice 2800mm F10.0 11” SCT with a very nice mount and a warranty for $6999. You would have to be a fool to buy this telescope as anything but a collectible.

http://www.optcorp.com/officina-stellare-rifast-800-f3pt8-telescope-rifa800.html

http://www.optcorp.com/celestron-cge-pro-1100-telescope-11087.html

Direct link | Posted on Apr 29, 2015 at 12:54 UTC as 35th comment | 3 replies
In reply to:

cpt kent: Seems to be a lot of folks exclaiming brilliance without questioning. Sources? References? Research? Further reading?

You shouldn’t take any of this on faith. You should read everything they wrote(Several times). Then reason through their conclusions. Then refer to other sources to confirm those results. Once you have done that you will come to the conclusion that they are in fact correct.

Direct link | Posted on Apr 28, 2015 at 19:18 UTC
In reply to:

Mssimo: In a few cameras with "ISO Irreverence". Would you recommend not to use anything but base ISO up to the point where the camera starts to use hardware amplification?

Stop chatting and keep writing. :)

Direct link | Posted on Apr 28, 2015 at 19:14 UTC
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