Dan Paris

Joined on Nov 29, 2016

Comments

Total: 41, showing: 1 – 20
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In reply to:

Dan Paris: Well, any decent $500 telescope can do the same....

@Greg OH : astrophotographers around the world would be interested to know this ! This is actually the opposite, for a given price point well-made telescopes are much better to shoot the moon and deep sky objects than telephoto lenses.

If you're willing to go to premium brands, for less than $4000 you get a 530mm f/3.3 equivalent with spot sizes smaller than 3µm across full frame, for all wavelengths :

https://www.takahashiamerica.com/tak-epsilon-e-160ed.html
Which telephoto lens can achieve this (at this price point or above) ?

Link | Posted on Apr 14, 2021 at 15:56 UTC
In reply to:

Astrobobo: And that Moon shot is an "achievement"? You can do much better with a small telescope for under $500. https://youtu.be/i5yGaDQ_Jh4

@Magnar W: in terms of contrast an APO lens will beat a reflecting telescope but not in sharpness. My 8inch reflecting telescope will blow out of the water any 6inch APO triplet in terms of resolution, assuming the atmosphere is steady enough.

Link | Posted on Apr 10, 2021 at 14:24 UTC
In reply to:

Dan Paris: Well, any decent $500 telescope can do the same....

Some random example found on Youtube
https://www.youtube.com/watch?v=lZS2YSIBD9w
This is shot with a $350 achromatic refractor (1000mm f/8.3 lens equivalent).

Link | Posted on Apr 10, 2021 at 11:56 UTC

Well, any decent $500 telescope can do the same....

Link | Posted on Apr 9, 2021 at 21:44 UTC as 46th comment | 6 replies
On article Hands-on with the Pentax K-3 Mark III (435 comments in total)
In reply to:

User1234567890: Is there any statement from them to explain why they do not go mirrorless?

Can't you understand that some people simply don't like shooting with an EVF, and don't need gadgets like live exposure preview, etc. ?

Link | Posted on Apr 1, 2021 at 13:15 UTC
On photo Early ascent, Pyrenees in the Into the sun challenge (10 comments in total)
In reply to:

D Gold: Excellent photo!

Thanks for your message !

Link | Posted on Jan 20, 2021 at 07:09 UTC
On photo Early ascent, Pyrenees in the Into the sun challenge (10 comments in total)
In reply to:

Albert Valentino: Excellent

Thanks Albert !

Link | Posted on Jan 20, 2021 at 07:09 UTC
On photo Early ascent, Pyrenees in the Into the sun challenge (10 comments in total)
In reply to:

Sue Anne Rush: Beautiful - Congratulations on this fine win on the Early ascent, Pyrenees :)

Thanks Sue Ann, much appreciated

Link | Posted on Jan 20, 2021 at 07:09 UTC
On photo Early ascent, Pyrenees in the Into the sun challenge (10 comments in total)
In reply to:

Supisiche: Great :)

thanks for your message !

Link | Posted on Jan 20, 2021 at 07:08 UTC
In reply to:

winkalman: 101 AF points; here's hoping that Pentax finally gets a body with competitive autofocus.

As usual there are plenty of snarky comments, but those who have actually used Pentax cameras know that this is an underdog worth rooting for.

By itself the number of cross-type point does not tell the true story. After all neither the Z7 nor the EOS R5 have cross-type AF points...

Link | Posted on Oct 27, 2020 at 17:44 UTC

I don't understand why the Z-mount is spotlighted, I quote, for its "largest mount diameter for more light gathering ability".

Every test of Z-mount lens, compared to its F-mount counterpart, shows an increase of vignetting (see reviews on Lenstip for instance). To be precise, 20,24, 35 and 50 have significantly worse vignetting in their Z-mount version, while 85 are on par.

For that matter, it seems to be the same for RF-mount lenses vs. EF mount lenses.

I understand that short flange mounts have some advantages in terms of lens design, but it seems that vignetting control is not one of them.

Link | Posted on Oct 8, 2020 at 15:35 UTC as 111th comment | 1 reply
In reply to:

No Outlet: These lenses are about as small as you can get for their focal lengths and FF. And yet the 800mm lens is still about twice the volume of an M43 400mm zoom with similar equivalent aperture. Zooms are typically larger too. But they have more uses.
But still for FF these are great options and as small as you can get for 800mm with good IQ and contrast.

This is not exactly how things work, you need to put sensor pitch into the equation.

Highest resolution M43 sensors have 3.32µm pixel pitch.
EOS R5 sensor has 4.38µm pixel pitch.

So a 540mm lens on the EOS R5 will give you the same resolution (hence reach) as an M43 400mm lens.

If you replace the EOS R5 by an A7RIV, you just need a 450mm lens to get the same resolution as an 400mm lens on M43.

So the lens size benefit is not as great as one may think.

https://camerasize.com/compact/#840.376,826.848,ha,t

And of course FF is more versatile since you don't have to crop to M43 size.

Link | Posted on Oct 5, 2020 at 19:53 UTC
On ChallengeEntry:13472 (2 comments in total)

Well, maybe it's because of my European perspective but I feel rather uncomfortable with the theme "people from your race". Am I supposed to share more with people which just so happen to share common physical characteristics with me? Why should I be proud of people that I don't relate to in any other way ? Who should I consider as "people of my race" with family coming from several countries scattered on two continents ?

Posted on Sep 20, 2020 at 15:19 UTC as 3rd comment | 1 reply
On article Sony a7C review: Compact size, big sensor image quality (2228 comments in total)
In reply to:

Dan Paris: Sorry for the dumb question, but is a viewfinder on the left side only comfortable for half of the public ? (I personally shoot with the left eye that's why I'm wondering)

Thanks, this is what I was thinking. I shoot only with DSLRs which don't have this problem of course (along with most FF MILC's)

Link | Posted on Sep 15, 2020 at 10:34 UTC
On article Sony a7C review: Compact size, big sensor image quality (2228 comments in total)

Sorry for the dumb question, but is a viewfinder on the left side only comfortable for half of the public ? (I personally shoot with the left eye that's why I'm wondering)

Link | Posted on Sep 15, 2020 at 10:27 UTC as 357th comment | 12 replies
On article Canon RF 600mm F11 real-world samples (387 comments in total)

It would be interesting to compare with the outcome of a 400mm f/5.6 lens (which is actually shorter, not so heavy and rather cheap on the second hand market). For sure the 600mm has a bigger magnification but the 400mm has probably better optics (at least, it is not limited by diffraction) and the two-stop advantage translates into lower ISO and less noise... My bet is that the amount of recorded detail would not be significantly different, and of course a 400mm is more versatile.

Link | Posted on Aug 25, 2020 at 14:11 UTC as 92nd comment
On photo Comet NEOWISE in the Open Challenge challenge (19 comments in total)

wonderful shot ! well-deserved win

Link | Posted on Jul 21, 2020 at 09:58 UTC as 8th comment | 1 reply
On article DPReview TV: Canon EOS R6 review (574 comments in total)
In reply to:

Ilan_H: The resolution is a downer for me. I would have been happy with >24. Aside from that, lens options and prices make it not a clear winner over Sony A7III and even A7RIII that together with tamron lenses could be cheaper.

Compared to 24 Mpix sensors like inside the A7III, the difference in linear resolution is less than 10%... is it really a big deal?

Link | Posted on Jul 17, 2020 at 08:42 UTC
On photo Moonrise over Lac Lerié in the At Night challenge (8 comments in total)

Thanks a lot everyone for your messages, much appreciated ! Merci beaucoup !

regards,

Dan

Link | Posted on May 8, 2020 at 14:49 UTC as 2nd comment
In reply to:

Dan Paris: It is impressive to see how much sharper the Ricoh GRIII lens is compared to the X100V (look at the banknote for instance). Even the X100F looks sharper than its heir?

According to the EXIFs, both are shot at f/5.6, so I don't see any disadvantage for the X100V ?

Link | Posted on Apr 9, 2020 at 13:55 UTC
Total: 41, showing: 1 – 20
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