I want to use minolta md lens in dslr

When you are using non brand lenses, with an adapter ring, most camera's can't communicate, so you have to use the lens as a non chip lens and it only will work in full manual mode. So switch the camera to M (manual) and then do manual focus and manual aperture on the lens. When you shoot a picture, look on the histogram if you need a faster or slower shutter speed and dial in the speed (manual) you think is correct.

What lens mount do you have on the lens? In other words, with what make film camera did you use the lens? A DSLR from the same company should be able to use the lens.

The step-up ring will on any lens with a 49mm filter thread, regardless of the manufacturer. The easiest way to find out whether it works with any given lens is to see whether the ring fits onto the front of the lens (you could also read the filter size written on the lens itself).
If it doesn't fit, purchase the appropriate step-up ring. That will be much cheaper than buying a whole new set of filters.
If the new lens(es) have a 55mm filter thread then you don't need the step-up ring at all. The filters will mount directly onto the lens.

It can be used with a Sony DSLR however you'll need to buy a a T mount adapter in order to get it to work. You'll need to buy a T-mount Sony/ Minolta adapter. Look here to see what it is you need http://www.bhphotovideo.com/c/product/601244-REG/Vivitar_650_1300mm_f_8_16_Manual_Focus.html

Instead of asking Sony, why don't you e-mail the tech people at vivitar?

Minolta had two lens mounts. One for manual focus SLR film cameras and one for Auto Focus SLR Maxxum film and digital SLR cameras. Sony uses Minolta Maxxum lens mount.
If the Sigma 400 f5.6 lens was made for Minolta X-700 series, XG, series, XD series, SRT series, then it will not fit on your camera.

Unfortunately, it is not possible to mount Minolta lenses on a Pentax K mount camera and retain either auto-focus, metering, or the ability to focus at infinity.
The reason for the loss of the ability to focus at infinity is because the distance from the mount to where the image forms on a Minolat lens is 43mm, whereas on a Pentax it is 46mm, so the Minolta lens glass would need to be 2mm into the body of the Pentax camera in order for the image to form on the sensor (i.e. have a clear image that is in focus).
The only solution to this is to purchase an adapter with an optical element such as this: http://photo-adapter-llc.amazonwebstore.com/Zykkor-Minolta-MD-Lens-to-Pentax/M/B004PB8142.htm?traffic_src=froogle&utm_medium=CSE&utm_source=froogle This will allow you to focus at infinity, however you will have to use stop down metering and manual focus, as the electrical contacts will not connect. Also, you can expect a slight loss of image quality when using an adapter.
I personally have a few Minolta lenses that I have wanted to use on my Pentax, so I understand your pain. It is a shame they don't work better.
Thank you for using FixYa!

Depending on how new your Minolta SLR film camera was, the lens may or may not work on a Minolta Digital SLR. In many cases, a lens with the correct mount (in this case, a Minolta mount) can be used on the same brand of camera in the digital format.

One thing you should know is that DSLR sensors are, generally speaking, smaller than the size of a 35mm film negative. Long story short, that means that your lens will have a magnification factor on the DSLR. Usually, it is in the range of 150%, so a 70-300 lens from a film camera would cover 105 to 450 on a Digital SLR.

To be sure about the mount, you'll need to seek advice specific to Minoltas -- probably best to take your lens to a local camera shop and see for sure if it fits and what features will work (aperature, auto-focus, etc) and which won't work on the DSLR.

If your new DSLR has the ability to be used in some mode with accessories like microscopes, telescopes, and the like (perhaps via T-adapters), you should be able to mount the lens via a screw-mount adapter for your brand. Unless the lens has a switch to make the aperture setting manual, though, or your adapter depresses the aperture pin on the lens, you will only be able to use it wide open. Generally, you should only expect to be able to use a manual exposure mode or perhaps an aperture priority mode.

Further, on some brands of camera (like Nikon), you will not be able to focus out to infinity with the lens with a simple adapter. While there are adapters that include an optical element to allow infinity focus, you should do some research to get one with good optical quality. The one made by Bower appears to do a decent job:

http://www.flickr.com/photos/mureena/2853461109/

Other camera brands may be able to attain infinity focus with a simple adapter.

In general, adapting an older screw-mount lens to a newer body is going to require some constraints that are likely only worth the bother if the lens provides some capability you otherwise do not have in your current selection of lenses or is unique in some fashion. It would be, for example, a good way to obtain the use of a lens like the Sirius 500mm f/8.8 mirror lens, which uses the fixed f/8.8 aperture. It would be doubtful that adapting the Sirius 80-200mm f/3.9 zoom would make you happy, though, when a lens offered within your DSLR brand of similar speed would not cost much and could be used in all modes offered by the camera, and have autofocus as well.

well is it a analogue lens designed for 35mm film camera's of minolta ? Most of the time wenn using a non -cpu lens on a dslr body yuo have to lock the apature to the highest count (for example F 22 ) otherwhise thae camera will or might refuse to operate. if the lens is not to old you can try if the camera will outo focus if not you have to set the Autofocus to Manual Focus and lock on the target by turning the focus ring

Devlious greetingsz