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DT lens for Fullframe

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AxitNitric View Drop Down
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Post Options Post Options   Quote AxitNitric Quote  Post ReplyReply Direct Link To This Post Topic: DT lens for Fullframe
    Posted: 25 August 2020 at 15:06
Tonight while I put the DT 50 F1.8 lens on A900 body, on viewfinder I see no dark in 4 corners. So I've tried to focus on a point, press the lens release button then shot a pic. I got a pic that no dark corner.
But normal the body A900 reconize the SAM 50 F1.8 is a DT lens and auto crop pic to half frame
So is there any body got a way to make the body A900 don't crop the pic?
 



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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 25 August 2020 at 23:10
I believe with the a99ii the auto crop can be turned off .
I'm not sure about the a99 .
I'm pretty sure all the E mount cameras can have auto crop disabled .
It would be simplest to download the manual and check in it before buying a camera .

However it would be far cheaper to just buy a full frame 50mm lens and stick with the a900 !
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Post Options Post Options   Quote LAbernethy Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 01:02
well the SAL50F18 has the same size orifice at the back as the SAL85F28 and is 5mm larger that DT 16-80 ZA, so I doubt the 50 1.8 is a true DT lens. That said, I think the answer is "no".

Edited by LAbernethy - 26 August 2020 at 01:11
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Wētāpunga View Drop Down
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Post Options Post Options   Quote Wētāpunga Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 01:04
It's been a long time since I used an a900, but from what I can recall, there was no way to turn off the automatic APS-C crop feature.

The ability to manually set, or remove, the APS-C crop feature came in later cameras. I think in part, because of popular demand
a77ii- Sony 135/2.8 STF, 16-50/2.8, 70-200/2.8 G
a7riii- Voigtländer 15/4.5, Zeiss Loxia 21/2.8, 35/2, 50/2, 85/2.4, Batis 85/1.8, Voigtländer 110/2.5, Sony 24-105/4 G, Sigma 100-400 f5-6.3.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 02:34
If you wanted to shoot the lens wide open on the a900 , you can lock focus and then press the lens release button before pressing the shutter release button .
When you press the lens release button it disconnects the lens and the camera doesn't know it there .
So a shot is taken just the same as if you had a M42 lens attached .
So not cropped .
Just make sure the lens is still attached and locked on afterwards , otherwise it might fall on the floor .
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Post Options Post Options   Quote skm.sa100 Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 12:56
That's clever, Neil.
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 13:04
Might be possible to re-chip it using an aftermarket chip but likely cheaper getting a Minolta 50mm f/1.7 lens instead.
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 13:28
As far as I know Neil's method is the only method to get the full frame image with a "recognised" DT lens on the A850/900. Only problem is that it only works full open (i.e at f1.8), unfortunately there's no way to set a smaller aperture.

If you have a Sigma or Tamron DT lens the camera doesn't recognise them as such and allow you to shoot full frame if you want to, you have to manually set those to APS-C if that's the way you want to use them.
Mind the bandwidth of others, don't link pictures larger then 1024 wide or 960 pix high, see here
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 13:58
Originally posted by pegelli pegelli wrote:

As far as I know Neil's method is the only method to get the full frame image with a "recognised" DT lens on the A850/900. Only problem is that it only works full open (i.e at f1.8), unfortunately there's no way to set a smaller aperture.

If you have a Sigma or Tamron DT lens the camera doesn't recognise them as such and allow you to shoot full frame if you want to, you have to manually set those to APS-C if that's the way you want to use them.


It wasn't my idea , but I think it was Bob that suggested that whilst the lens release button is pressed in , slightly turning the lens allows the aperture to stop down a bit .
He says he didn't have any problems doing this .
I wouldn't like to do that though partly because of the risk of causing a short on the lens contacts and partly due to the fact the lens could end up on the floor .

But when you can buy a Minolta 50mm lens with a free film body got £40 as a buy it now , why bother ?
https://www.ebay.co.uk/itm/124173623746

There's a lens on its own on eBay U.K about to end bidding in a few minutes that's currently less than £30 .
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 14:15
Originally posted by wetapunga wetapunga wrote:

The ability to manually set, or remove, the APS-C crop feature came in later cameras. I think in part, because of popular demand
You can set or remove the crop manually with the A900, just not with a Sony DT lens
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2020 at 21:01
Originally posted by pegelli pegelli wrote:

As far as I know Neil's method is the only method to get the full frame image with a "recognised" DT lens on the A850/900. Only problem is that it only works full open (i.e at f1.8), unfortunately there's no way to set a smaller aperture.

The aperture can in fact be controlled to an extent by rotating the lens a bit as if you're going to remove it. The downside as opposed to just pressing the lens release: You do have to be careful not to rotate it too far.
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 27 August 2020 at 09:51
I went through the process of trying this on my A900 and some film cameras with similar results, except that I found most of the DT lenses had vignetting in the corners of the image, even when these were not visible through the VF.
So far as I recall, most of the DT zooms will vignette over half their range (the wide end?) and most of the primes vignette to some extent. Okay if you're happy to crop a bit, of course.

But I agree the Minolta 50mm/f1.7 is a good lens despite its low cost. It has just about the best bokeh circles I've seen so it's ideal for those blurry Christmas lights and OOF streetlights!

Oh, and if you like getting those star effects on lights in night pics, you have to pick your lens carefully. Most of the Sony & Minolta lenses are useless because they have rounded iris blades. The cheap film-era Sigma zooms are great for 6-point stars even at modest aperture.

Not everything is about sharpness ....
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 27 August 2020 at 10:06
Oh don't knock the Minolta's for starbursts! The "beercan" line of lenses mostly have straight blades and will deliver mostly 14 point starbursts if stopped down just a tad.

24-50mm F/4

DSC04054-Edit-2 by Johan Olsson, on Flickr

35-105mm Original

DSC03149 by Johan Olsson, on Flickr

70-210mm f/4

DSC00994 by Johan Olsson, on Flickr
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