X2 Magnifier

[texasdirt]

Hello all,

This is my first post.

My problem is I recently bought a Kamero Auto 2X Converter to use on my Minolta x-370 I took several rolls of film with this lens attached to both a 100mm-200mm Minolta lens and also on a Rokkor-X 50mm lens.

I love the fact it give a 2 times zoom but all the photos with it so far (indoor use) have a blue cast on the image. where the same lenses without the converter do not have the blue tint?


I tried several aperture and shutter speeds to try to get around it but does not seem to matter.

So my questions are:

1.) Does anyone have knowledge of the Kamero Auto 2X Converter
2.) Is the blue cast caused by the lighting in my house?
3.) Is there a fix for this other than studio lighting?
4.) or did I just get a bad lens?




Shot was lit with a Halogen Work Light

Film was Fuji 200 ISO color

[Deleted]

It would help if you could include some examples of the photos. A blue cast sounds more like coloring due to florescent lights. Have you tried shooting the same shot indoors without the converter?

[Deleted]

Sorry for being impolite.

Welcome to the forum.

[mickeyobe]

I am not familiar with the Kamero Converter but some lenses and some lens accessories may introduce unwanted colour casts.
You did not indicate how intense the blue cast is.
You might try using a Skylight or UV filter on the lens. If that does not give enough correction you might have to go to a stronger warming filter.
There are quite a few different kinds and intensities so this is where a knowledgeable dealer could prove his worth.
I don't think altering the aperture will change the colour.

Mickey

[texasdirt]

OK I added a bit more info to my post and added a sample photo. and without the convertor I did not get this color issue

[mickeyobe]

That is pretty awful.
Try the following site. It may answer your question although it wont cheer you up.

photo.net/pentax-camera-forum/00Ms2g

Mickey

[Andrew]

pretty awfull is right!! sheeze....no one would of guessed it was that extreme with out a sample! which is why people mentioned that it may be a colour cast from indoor lighting.

if you have taken the same picture under the same conditions, with and without the 2x adapter and this is the result with the 2x adapter .i think you have already an idea its the adapter and nothing else.

i am not familar with the finer details on how these adapters work as i have never had one or much of an interest in getting one--except in days long gone when i used to like to shoot nature (birds and such) using 35mm canon gear; i always wanted one of those huge 600mm tele lens but they were mega thousands and my pockets wernt deep enough at the time,so i thought about buying a 2x for the 300mm..never did tho..

anyway my thoughts are 1) it must be a bad lens as no lens maker could possibly put something like this on the market- but i wouldnt get another one for quids! save up for tele lens

2) i would tend to think that whats happening is the adapter is not allowing all the colours entering the lens to focus at the one point. that is the basic function of lens design and is acomplished in varying degrees with lens manufactures. a poorly corrected lens using B/W film will not render critically sharp images and using colour film it will show up more easily. most often in the form of blue and/or red fringes of colour where black and white meet in a colour image...some people nowadays actully like this effect in some old lenses using colour film because it can sometimes have a dreamy or pastel effect on the image, though of course these lenses were never intended for colour film to begin with..

anyway the point is your looks SO far out its not funny, just hidious! its either not attatched correctly or its not worth having. i would give it to the Kids to use as a magnifying glass and let them burn ants or throw it a long long way away. but thats just me eh

[mickeyobe]

I am really puzzled.
Yes there is a heavy blue colouration to the letters particularly near the bottom of the page which evidently received less exposure than the top of the page.
The blue only occurs in what should be the black and/or dark areas such as the shadow and the lettering.
The white pages and the cloth are are warm, pinkish colour.
As Andrew said, a poorly colour corrected lens would give colour fringing. That is not what you have here.
I can only guess that the lens in question was purposely designed for some specific purpose and not for general picture taking. Perhaps it was designed for a particular light source.
It would be interesting to see what it does outdoors in the sunlight and at night under some of the peculiar street lights such as sodium vapour that many cities have.

Mickey

[texasdirt]

Thanks for all your replies. I shot a few outdoor shots today with it and when I get them devoloped I'll let you know the result in sunlight.

[Peter S.]

Hi T.,

You should try to expose a roll of slight film (Fuji Sensia would do fine, Kodak Elitechrome is also OK) using Your camera in manual mode. In fact a hand meter would even be better. My idea is this: had the color cast being introduced by underexposed film?

There is no better way in checking colors than using slight film as the lab typically is less prone to failure.

Best regards
Peter