Full frame lens on crop sensor camera ??
Mar 3, 2021 17:50:31 #
Mr.Ft wrote:
Hi, I was out shooting with my 80D and EF 100-400 ... (show quote)
You can probably trace that to Tony Northrup and his complete misunderstanding of DXO's DXOMark rating system and the concept of Perceptual Megapixels. To someone who is unfamiliar with it - EF (Canon) and Goldring-FX (Nikon) lenses do not perform as well on crop bodies than crop lenses - which is total nonsense, and fake news.
Mar 3, 2021 18:07:26 #
bleirer wrote:
No one has provided any documentation about why his claim is wrong, though. Anyone have any facts?
Other than analytical logic? Not yet.
Not worth the trouble for me.
Believe what you want.
Mar 3, 2021 18:15:27 #
Longshadow wrote:
Other than analytical logic? Not yet.
Not worth the trouble for me.
Believe what you want.
Not worth the trouble for me.
Believe what you want.
I neither believe not disbelieve, just wondered what the facts were. To me it makes no sense that a lens would change its stripes just because the sensor got smaller. But that is not what he argued. He said lenses designed for crop bodies could perform better on a crop body than one designed for a full frame body on a crop body. Not saying I buy that either but he did offer some supporting examples.
Mar 3, 2021 18:34:38 #
bleirer wrote:
I neither believe not disbelieve, just wondered what the facts were. To me it makes no sense that a lens would change its stripes just becsuse the sensor got smaller. But that is not what he argued. He said lenses designed for crop bodies could perform better on a crop body than one designed for a full frame body on a crop body. Not saying I buy that either but he did offer some supporting examples.
Not the same sensor just smaller, it's different sensor (built differently).
Different software to handle the different sensor too.
Oranges and kumquats.
Mar 3, 2021 20:53:22 #
Mar 3, 2021 21:08:17 #
If the camera shop conversation was about *wide angle* lenses then it sorta made sense for that purpose, but the dweeb who approached you should not extrapolate that to include long lenses.
Mar 3, 2021 22:36:35 #
bleirer wrote:
I neither believe not disbelieve, just wondered what the facts were. To me it makes no sense that a lens would change its stripes just because the sensor got smaller. But that is not what he argued. He said lenses designed for crop bodies could perform better on a crop body than one designed for a full frame body on a crop body. Not saying I buy that either but he did offer some supporting examples.
The size difference between FX and DX is rather insignificant compared to the difference between DX and 6x9 or 4x5. The resolving power of good lenses for those roll and sheet formats is lower than lenses for mini formats, so it’s best to use mini lenses for mini formats. But FX and DX are such similar minis that the issue of resolving power of lenses is negligible or zero.
Sometimes the FX lens improves when used on a DX sensor since distortion, soft corners, and vignetting are just cropped off in-camera. Acoarst the stock lens shade for FX is ineffective for DX so you can just leave it off (unless it’s your crash bumper).
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BTW it’s really best not to talk shop with dweebs who approach you while you’re working. They have nothing to offer. If they were for real, they’d follow etiquette and know better than to bother you while you’re working.
If I saw a stranger using a huge zoom with a pop up flash, or any other easy to spot error, I’d let them learn their way on their own. I would never intervene.
Mar 3, 2021 23:02:12 #
mwsilvers
Loc: Central New Jersey
Mr.Ft wrote:
Hi, I was out shooting with my 80D and EF 100-400 ... (show quote)
You aren't using the edges of a full frame lens when its mounted on a crop body like the 80D due to the camera's smaller sensor. However, there is no reason why you shouldn't use one on your camera. I have several full frame lenses that I use regularly on my Canon 7D Mark II. I wouldn't be surprised if the "person at the camera shop" this random photographer was referring to was a clueless salesperson at a Best Buy. Either that, or the person you spoke to just misunderstood what he was told.
Mar 4, 2021 05:04:38 #
bleirer wrote:
There was a recent web guru who was a youtube team with his wife, that gave a lot of science sounding reasons why DXO scores proved that crop lenses performed better than full frame lenses on crop cameras. I did not follow the math he used. Logically it would seem the full frame lens casts the same image circle no matter the size of the sensor, and the crop sensor would only use the sweeter center part of the circle. So I'd say go forth and gather photons.
Here is the thread and my response to that guru, exposing his claims as nonsense, with a real response from DXO on the topic of Perceptual Megapixels - which only seek to compare a given lens on a given body with a theoretically perfect, flawless lens. His interpretation would have you believing, as he does, that sharper lenses will not be as sharp on smaller sensors, but anyway, here is the page, but the entire thread is worth a look.
https://www.uglyhedgehog.com/t-377405-4.html
Oh, and the guru made exactly 7 posts on this forum and moved on. I guess he didn't expect that anyone on a forum named Ugly Hedgehog would know anything.
Mar 4, 2021 05:09:57 #
cmc4214
Loc: S.W. Pennsylvania
[quote=pmorin]Believe none of what you hear and half of what you see.
😎
With photoshop capabilities today, I don't know if I would believe even half of what I see
😎
With photoshop capabilities today, I don't know if I would believe even half of what I see
Mar 4, 2021 05:28:34 #
miked46
Loc: Winter Springs, Florida
I have always used FF canon's on my 80D and even my 70D when I owned that one. better Glass, better reach
Mar 4, 2021 05:35:41 #
Fire away, my friend. No problem using a full-frame lens. Maybe a bit heavier setup and more expensive but this way you build a lens collection that can be used when you do purchase a full-frame camera.
Mar 4, 2021 05:42:42 #
johngault007 wrote:
I have mastered the "IDGAF" stare if people are ever around me. It says I'm not approachable and I don't want to engage in small talk. The random and sometimes incorrect comments like the one you received above are something I haven't had to deal with, but the tourist "getting anything good?" question gets old. 
When they ask "getting anything good?" answer yes and that you just sold two for publication last week at $1000 per.
Mar 4, 2021 06:03:52 #
Total BS - you can always use a FF lens on a crop body. Identical lenses except for the coverage on the sensor plane - crop lenses are a bit smaller because of this, but everything is the same focal length, fstops, etc. I have 4 DX lenses but all of the others are FX since I plan on adding FF sometime down the road. If you only get crop lenses for your crop camera you are limiting yourself and if you decide to add FF in the future you will have to buy a set of FF lenses (or crop the image which defeats the purpose of FF.) The central part of almost every lens will be the "sweet spot".
Mar 4, 2021 07:40:22 #
Fred Harwood wrote:
I use both lenses on my D7000 without any problems.
Heres proof that they work toether. oops next one will have the picture
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