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12-08-2014, 03:19 PM   #16
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QuoteOriginally posted by roosm Quote
Ah, ok. So it doesn't show this number but still works as it should.

You have all really been great. Thanks for all the help!

Mike
roosm - unless your girlfriend is very adept mechanically or wants to learn the ins and outs of a full manual lens, you may be doing her a favor by getting an 'A' style lens vs the full manual lens you have now.

An A lens is much easier to use as the only thing she will have to worry about is focusing, as the aperture can be controlled by the camera automatically if you leave the aperture on A, and shutter speed can be pre set so all she does is focus and shoot. This will avoid frustration. There is no need to use the green button with the A lenses.

If you can swing it, you may still have time to get one before Xmas and later sell that manual lens to get some cash back.
Check our marketplace or eBay for options, if you have questions feel free to ask.

Would be better than have her frustrated by the gift.

12-10-2014, 01:21 AM   #17
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Well you (crewl1) are probably right and when I got the lens I didn't fully realise the aperature manual thing, just the manual focus part of it.
However it still seems like an ok lens and I think it is manageable for her to shoot with. I got it for as little as 25 dollars including shipping to sweden.
This was just a spur of the moment kind of deal.

The real gift is a Tamron SP 90 mm Macro with auto-focus/aperture etc.

The Auto-chinon was just because I found it for cheap and her father had showed a Pentax 50 mm with f1.4 and she was amazed of the light through-put. Therefore the big issue with the Auto Chinon f1.7 seemingly a tad darker then the Tamron 18-250.

However. I followed your tip emalwick and took a foto with the tamron which apperently decided to go for f4.5 in the current light setting. I shot a photo of a picture on the wall. I then repeated with the Auto-chinon. Setting it to f4.5 and didn't press the green button. Therefore same shutter speed, same aperture and the same (at least very close) focus length.
Then it was obvious the Auto Chinon puts a yellow tint on the picture.
A google-seach later and I found a couple of threads discussing lenses getting yellow because of some radiation issue with old lenses.
This seems to be fixed by either direct sunlight or (more convenient in the northern latitude where I live and being winter) a LED light.

Thanks for leading me to this conclusion. From the other threads I gathered that the consensus was to leave it a week or so with direct light through the lens.

Except for some people thinking this was a feature of the lens and not a problem.
12-10-2014, 12:32 PM   #18
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QuoteOriginally posted by roosm Quote
However. I followed your tip emalwick and took a foto with the tamron which apperently decided to go for f4.5 in the current light setting. I shot a photo of a picture on the wall. I then repeated with the Auto-chinon. Setting it to f4.5 and didn't press the green button. Therefore same shutter speed, same aperture and the same (at least very close) focus length.
Then it was obvious the Auto Chinon puts a yellow tint on the picture.
A google-seach later and I found a couple of threads discussing lenses getting yellow because of some radiation issue with old lenses.
This seems to be fixed by either direct sunlight or (more convenient in the northern latitude where I live and being winter) a LED light.

Thanks for leading me to this conclusion. From the other threads I gathered that the consensus was to leave it a week or so with direct light through the lens.

Except for some people thinking this was a feature of the lens and not a problem.
The yellow tint could just be the wrong WB if you have auto-wb on. I'm not sure if that lens is known for having the yellow tint due to the radiation thing, but it might.
12-11-2014, 01:01 AM   #19
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Well, ok.
But if I set the camera to manual-mode and first use the tamron then the auto chinon is there any reason while with the same lighting in the room and the same focal length, f4.5 on both same shutter speed it would correct the white-balance differently?

It consistently gets more yellow with the auto-chinon.

I did some searching for auto chinon yellow and found this https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/207614-auto...yellowing.html

The lens is lying under LED-light now.
Should I use a specific type of LED-light or is anything good?
I understand it might go either quickly or slow depending on several things like power of the light etc.
But do all work, eventually?

Mike

12-11-2014, 01:03 PM   #20
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The lens has a 1B filter on it. Seemed to make it darker. The lens still look slightly yellow when looking through it at a white paper, even with filter off. I had tried taking photos with or without filter before. Probably just adjusted shutter speed slightly when pressing green button.

I witches from ABW to light bulb and all of a sudden the photos look white. Seems like the slight yellowing I think I see is very slight compared to what was going on with ABW.

I did another side by side with tamron and chi on f4.5, 50mm focal length 1/6 shutter speed and light bulb WB. Photos are now very similar. If I change the chinon to f1.7 and press green button I get 1/40 in same conditions! Again very similar pictures.

I tried the TAV mode which I just learned existed. Then ABW works fine, pressing lightly on the action-button does same thing as green button. Just choose aperture, hold lightly on the action-button and focus until the camera beeps, shoot! Even I can take decent pictures without fiddling now!

Thanks everyone! Now I am happy with the purchase and the lens!

Mike
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