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M42 to A Mount on A850/A900

S k u n k

By S k u n k,
in Adapters & Speedboosters

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S k u n k Newbie

S k u n k

Posted
Posted

Hi all! 

Did try searching but couldn't find much that specifically discussed this as a subject, so sorry if I'm duplicating a thread.

I have an A850 and would like to use M42 lenses (specifically Helios 44 series lenses, as I have several) but am unsure about the flange distance being safe with an adaptor. I really don't want to damage the mirror on my body, so I'm wondering if anyone can suggest an adaptor that will work, or if anyones had any experience with this? Tons of information out there about E mount of course but nothing on A mount! 

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Pieter Mentor

Pieter

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Posted (edited)

Since the flange distance of M42 is only 1mm longer than A-mount (45.5mm vs 44.5mm) and the throat diameter of M42 is narrower than A-mount, technically it's possible with a 1mm shim where the M42 thread fits right into the A-mount. These adapters do exist, like this one:

https://fotodioxpro.com/products/m42-sna-p-v1?srsltid=AfmBOoo6xau1kk888K5aamsUS8vbGOf1REt3Owc418sWdEZtaGKRH55R

Edited by Pieter
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S k u n k Newbie

S k u n k

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4 hours ago, Pieter said:

Since the flange distance of M42 is only 1mm longer than A-mount (45.5mm vs 44.5mm) and the throat diameter of M42 is narrower than A-mount, technically it's possible with a 1mm shim where the M42 thread fits right into the A-mount. These adapters do exist, like this one:

https://fotodioxpro.com/products/m42-sna-p-v1?srsltid=AfmBOoo6xau1kk888K5aamsUS8vbGOf1REt3Owc418sWdEZtaGKRH55R

Ideal, thankyou Pieter! I did think this would be the case, not sure why I didn’t have a look for Fotodiox

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XKAES Experienced

XKAES

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Posted

There are lots of M42 to a-mount adapters.  I use them on my a850, too.  But the different adapters have some differences.  You should check them out.  For example, I use a PIXCO adapter which is a "CHIPPED" adapter.  Having a computer chip on the adapter allows you to get the GREEN focus verification LED to operate in the viewfinder -- even though you are using a manual-focus lens.  If that is of interest to you -- the a850 does not have any manual-focusing aids in the viewfinder, such as a micro-prism -- the PIXCO adapters are about the same price as unchipped models.

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    • XKAES
      JPEG options?

      By XKAES · Posted

      I'd suggest you start by running a simple test.  Take pictures of a typical scene/subject and each of the JPEG settings your camera offers.  Then compare them in the output that you normally produce.  You may or may not see a difference.  I normally shoot at the highest JPEG level and save that file -- but make a smaller file (lower resolution) for normal/typical use. There's plenty of editing that you can do with JPEGs on your computer -- depending on your software -- and there are features in your camera that can help out, as well.  That depends on your camera.  Put them together, and it might meet your needs.  For example, your camera probably has several bracketing features that will take the same shot with different settings with one press of the button.  Then you can select the best JPEG to work with on your computer.  I frequently use this feature to control contrast.
    • Cameratose
      JPEG options?

      By Cameratose · Posted

      If you set up some basic presets in your processing software and use batch processing, you don't need jpeg at all. I shoot RAW only, use (free) Faststone Image Viewer which will view any type of image file to cull my shots, and batch process in Darktable. I can start with 2000-3000 shots and in a matter of a few hours have them culled, processed, and posted. A handful of shots, say a couple hundred from a photo walk, are done in minutes.  This saves card space, computer space, and upload time.  The results are very good for posting online. When someone wants to buy one or I decide to print it, I can then return to the RAW file and process it individually for optimum results.  I never delete a RAW file. Sometimes I'll return to an old shot I processed several years ago and reprocess it. I have been very surprised how much better they look as my processing skills improved.  
    • Pieter
      JPEG options?

      By Pieter · Posted

      If you're only publishing small-sized photo's or viewing on a phone / computer screen, 12-ish MP should be more than enough for your needs. Since with JPEG, the ability to 'fix' stuff on the computer is very limited anyway, you're not giving up much except the ability to crop/recompose after taking the shot. If you tend to crop often or might print large, shoot fine quality instead as JPEGs don't take up a lot of space anyway. I tend to shoot RAW+JPEG. After a trip/shoot, I download my photos to my computer and quickly scan through my JPEGs to select my keepers. The JPEGs are fine for 90% of my needs but at times there are one or two 'WOW'-shots that I might one day print large. I'll edit the RAW of these photos to my hearts content, generate a JPEG, then delete all RAWs to clear up space.

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