La ea5 converter: I'm getting closer to pulling the trigger on a Sony A7 IV purchase. On a YOU TUBE video today I discovered that the camera body will recognize when an a APSC lens is...

photogeneralist Loc: Lopez Island Washington State

I'm getting closer to pulling the trigger on a Sony A7 IV purchase. On a YOU TUBE video today I discovered that the camera body will recognize when an a
APSC lens is attached and then automatically reset itself to apsc. Is this capability maintained when using non-native (IE SIGMA ART and TOKINA) A mount lenses through a la ea 5 adaptor?

I've not been able to verify compatibility with my non Sony A mount lenses (see below) via the internet so I'm turning to UHH so that I can hopefully learn from hoggers actual experience.

Being able to semi-seamlessly use my existing carefully chosen quiver of lenses rather than buying replacements would go a long way toward enabling the purchase of the camera and adaptor.

MDI Mainer

Best of luck going the adapter route, but anyway why would you want to mount APS-C glass and throw the pixels you've just bought and paid for away? Remember the pixel density on a 33 MP FF sensor will be less than on a 24 MP APS-C sensor, so a 33 MP FF sensor in APS-C mode renders a 14 MP image.

User ID

Maybe there’s an A_mount forum, or an A_mount subforum at a Sony forum. It’s worth checking but not my job. I use a dozen A_mount lenses on several old-ish E_mount Sonys, but have no questions and no complaints.

My approach to the OP’s “quandary” is to just buy the adapter and then however it works, thaz how I use it ... love it or not.

SteveG Loc: Norh Carolina

MDI Mainer wrote:

Best of luck going the adapter route, but anyway why would you want to mount APS-C glass and throw the pixels you've just bought and paid for away? Remember the pixel density on a 33 MP FF sensor will be less than on a 24 MP APS-C sensor, so a 33 MP FF sensor in APS-C mode renders a 14 MP image.

I use that mode when I want some extra reach from my telephoto. Yeah, it doesn't utilize the entire sensor but, 14mp's is plenty of resolution for most shots. I think they'll be OK when they want to go in that direction.

Canisdirus

I happen to have a Sigma 'art' 18-35mm A mount lens and a Sony A7RIV...and a L-5 adapter.

So I just slapped it on to see what happens...it is a crop sensor lens (made for the A77 line)...and I don't use it anymore. I bought the adapter to take advantage of the Sony body to my 70-400mm and my 135STF.

My camera did not automatically shift but that seems to be a marketing gimmick.
You can see the vignetting right off...if you shoot without noticing...photography may not be for you...see an eye doctor!
All of the newer sony bodies have an apsc switch...built in...right next to your thumb...auto detect...meh...seems weak.

I did get full access to the bodies capabilities with the crop lens...

If you have older A mount glass...that can still really perform optically...get the L-5 adapter for your newer Sony bodies.
It is the best adapter out there bar none...full AF points (on mine over 400)...fast AF (no limits by adapter) full DR...no FPS limitations.
There isn't a company out there with a better adapter of using their respective old glass line.
If you have the right body.

St.Mary's

MDI Mainer: Thank you for the short and to the point info on APS-C lens on full frame sensor camera. UHH is worth far more than its cost.

JimH123 Loc: Morgan Hill, CA

Canisdirus wrote:

I happen to have a Sigma 'art' 18-35mm A mount len... (show quote)

I also gave it a try. I use the Sony A6600 (APS-C camera) with the LA-EA5. But this time, I placed it on my A7iii, which is not fully compatible with the LA-EA5. And I placed the Sigma 10-20 on it, an APS-C lens. Only mode that I could use was manual focus mode. And I took a picture. In looking at the image, it still had the same pixel dimensions as the camera has with full frame lenses. There was no auto switch to APS-C mode.

And by-the-way, this Sigma 10-20 works perfectly with the A6600 and LA-EA5.

JBRIII

Might check on firm ware updates for lens if that is possible for the lens, been mentioned to help in some situations.

ORpilot Loc: Prineville, Or

I have These cameras a7ii, a7iii, a7Riv, and a6500. I also have adapters LA-EA2, LA-EA3, LA-EA4, and the LA-EA5. On my cameras with the exception of the a6500 you have to go to the menu and turn on the APS-C or Super APS-C mode for them to automatically convert the DT or APS-C lenses to view as full frame. I always set them to auto unless I want the extra reach by going On vs Auto, or off. As for whether you lenses will work in auto convert it depends on the lens. Most Minolta and Sony lenses convert and work OK. It is a guessing game with third party lenses. My A-mount Sigma lenses work ok. The LA-EA5 adapter is a bit more picky than the LA-EA4. Let me know what lenses you are trying to use and I will try them out, on my cameras if I happen to have those lenses. You may also contact B&H or your local camera store and see if they have used lenses to try on the a7iv. Sometimes they are helpful and other times they are not. Best to try and see.

azted Loc: Las Vegas, NV.

MDI Mainer wrote:

Best of luck going the adapter route, but anyway why would you want to mount APS-C glass and throw the pixels you've just bought and paid for away? Remember the pixel density on a 33 MP FF sensor will be less than on a 24 MP APS-C sensor, so a 33 MP FF sensor in APS-C mode renders a 14 MP image.

How do you come up with 14MP? I think the real answer is 22MP for an APS-C image on a 33MP sensor. If the conversion is 1.5, and you divide 33 by 1.5, I get 22. Am I wrong?

photogeneralist Loc: Lopez Island Washington State

ORpilot wrote:

I have These cameras a7ii, a7iii, a7Riv, and a6500... (show quote)

OR Pilot Thanks! MY lens quiver is: 1. TOKINA 11 -16 F 2.8 2. SIGMA 17-70 F 2.8 -4 3. SONY 70-400 G F4-5.6 4. SIGMA ART 30 F1.4 5. MINOLTA 50 F2.8 macro. Replacing those lenses with new e mount native lenses to cover the same range of effective focal lengths would be just shy of $5500. I can afford $250± but not $5500. I'm wavering even about the $2500 for the a7 IV body. I'm unsure if the expense would increase my joy of life that much.

Canisdirus

azted wrote:

How do you come up with 14MP? I think the real answer is 22MP for an APS-C image on a 33MP sensor. If the conversion is 1.5, and you divide 33 by 1.5, I get 22. Am I wrong?

1.5 X 1.5 is what you are missing.

1.5 X 1.5= 2.25. 14.6 X 2.25 ... 33MP

Sorry...it does not work out as well as you thought.

You have probably heard of 24MP equals 10MP before....same thing.

Factor rate squared... 24 divided by 2.25 = 10.6MP

SteveG Loc: Norh Carolina

photogeneralist wrote:

OR Pilot Thanks! MY lens quiver is: 1. TOKINA 11 -16 F 2.8 2. SIGMA 17-70 F 2.8 -4 3. SONY 70-400 G F4-5.6 4. SIGMA ART 30 F1.4 5. MINOLTA 50 F2.8 macro. Replacing those lenses with new e mount native lenses to cover the same range of effective focal lengths would be just shy of $5500. I can afford $250± but not $5500. I'm wavering even about the $2500 for the a7 IV body. I'm unsure if the expense would increase my joy of life that much.

We should all try and contact Sony about a firmware update for earlier cameras! I have the A7rII and it's plenty good. I would love the Laea5 but the Laea4 will just have to do

MDI Mainer

azted wrote:

How do you come up with 14MP? I think the real answer is 22MP for an APS-C image on a 33MP sensor. If the conversion is 1.5, and you divide 33 by 1.5, I get 22. Am I wrong?

Sorry but the conversion factor here is not 1.5. Think about this: compare a 24 MP APS-C sensor and a 24 MP full-frame sensor, e.g. a Sony A6600 and a Sony A7iii. Both have about the same number of pixels, but the density is different. The full frame pixels are larger (which is why low-light performance and dynamic range are better). Full-frame sensor is 36mm x 24mm or 864 sq. mm, while an APS-C sensor (except Canon) is 23.6 mm x 15.7 mm or 370.52 sq. mm. So the full-frame running in APS-C mode uses 370/864 (about 43%) of the full-frame pixel area.

More detail: https://www.sonyalphaforum.com/topic/13106-why-is-the-aps-c-image-from-a7r3-smaller-than-m43-20mpxl-image/

azted Loc: Las Vegas, NV.

Canisdirus wrote:

1.5 X 1.5 is what you are missing.

1.5 X 1.5= 2.25. 14.6 X 2.25 ... 33MP

Sorry...it does not work out as well as you thought.

You have probably heard of 24MP equals 10MP before....same thing.

Factor rate squared... 24 divided by 2.25 = 10.6MP

So, the conversion factor of 1.5 is strictly for the lens?