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01-25-2013, 05:33 AM   #1
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Pentax me super or LX with Tamron 70-300

I am having a blind spot over this I think?

I have used the Tamron before for these cameras. Am I correct in assuming that I have to set the f stop manually on the slr cameras?

Also, I note the lens is 4-5.6. When I use the lens with my dslr and on the A setting on the lens when I am on maximum zoom the fstop will only reach 5.6 yet it seems if I do this manually on the slr I will have the option of taking shots at f.4 with the zoom fully used. Will this cause problems/ Is this a reciprosity scenario. Is there any way around this other than to remember to use 5.6 and larger apertures when the zoom is fully in use?

Sorry if that isn't a very erudite and technical question but I hope that it makes sense

01-25-2013, 05:50 AM   #2
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QuoteOriginally posted by Snapper_UK Quote
Am I correct in assuming that I have to set the f stop manually on the slr cameras?
Certainly on the LX that is the case.
Its exposure automation was all done with shutter speed.
Although I never used an ME Super,
I'm guessing it's the same there,
because it came with the M lenses.
01-25-2013, 05:58 AM   #3
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QuoteOriginally posted by Snapper_UK Quote
Also, I note the lens is 4-5.6. When I use the lens with my dslr and on the A setting on the lens when I am on maximum zoom the fstop will only reach 5.6 yet it seems if I do this manually on the slr I will have the option of taking shots at f.4 with the zoom fully used. Will this cause problems/ Is this a reciprosity scenario. Is there any way around this other than to remember to use 5.6 and larger apertures when the zoom is fully in use?
If you're shooting negative film,
there should be enough latitude
to allow for one stop of variation.

Actually, if you use shutter speed automation,
the camera should do any compensation for you.
For certain speeds, the LX does a real time measurement
according to the light reflected off the film surface.
01-25-2013, 06:02 AM   #4
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Thanks but all abit over my head.

I suppose I am asking will the two cameras take decent and properly exposed photos at f4 setting on the tamon with the lens zoomed in to the maximum. I think it is a yes but not quiet sure

John

01-25-2013, 06:04 AM   #5
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QuoteOriginally posted by Snapper_UK Quote
Thanks but all abit over my head.

I suppose I am asking will the two cameras take decent and properly exposed photos at f4 setting on the tamon with the lens zoomed in to the maximum. I think it is a yes but not quiet sure

John
I would think so.

If manual settings don't give ideal exposures,
try using the automatic shutter settings
01-25-2013, 06:48 AM   #6
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These bodies both offer aperture priority automation.

Setting the lens to 'A' is functionally the same as setting it to the minimum available f-stop.

Setting the lens to '4' is functionally the same as setting it to the maximum available f-stop and in this case the maximum available aperture varies with the zoom setting the same way it does on your DSLR.
01-25-2013, 08:28 AM   #7
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The lens set at f/4 doesn't mean it's going to be at f/4. That's only at 70mm.
01-28-2013, 03:24 AM   #8
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QuoteOriginally posted by Giklab Quote
The lens set at f/4 doesn't mean it's going to be at f/4. That's only at 70mm.
I am lost.

If I set the lens at f4 and shoot at 300 does the camera overide this setting then and go to f5.6?

I understand aperture priority but I need to know how to set the lens either using A or manually and what it will do at differing lengths.

Sorry if I am slow but to me this still isnt clear. Many thanks

John

01-28-2013, 03:40 AM   #9
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QuoteOriginally posted by Snapper_UK Quote
If I set the lens at f4 and shoot at 300 does the camera overide this setting then and go to f5.6?
If the physical opening of the aperture ring gives f/4 at 70mm,
the same opening will give a smaller "f number" aperture, like f/5.6,
if you increase the focal length of the lens by zooming in.

QuoteOriginally posted by Snapper_UK Quote
I understand aperture priority but I need to know how to set the lens either using A or manually and what it will do at differing lengths.
I don't think you need to worry about this at all, John.
Just set an aperture that you think is right, like f/5.6 or f/8,
then go ahead and shoot with the camera set to Auto exposure.
Unlike slide film, negative film is quite forgiving
about any minor errors of exposure.
01-28-2013, 03:44 AM   #10
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QuoteOriginally posted by lytrytyr Quote
If the physical opening of the aperture ring gives f/4 at 70mm,
the same opening will give a smaller "f number" aperture, like f/5.6,
if you increase the focal length of the lens by zooming in.



I don't think you need to worry about this at all, John.
Just set an aperture that you think is right, like f/5.6 or f/8,
then go ahead and shoot with the camera set to Auto exposure.
Unlike slide film, negative film is quite forgiving
about any minor errors of exposure.
Thanks. I still wonder though is it physically possible to shoot f4 at 300 on a slr? On a DSLR it wont let me!
01-28-2013, 04:28 AM   #11
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QuoteOriginally posted by Snapper_UK Quote
Thanks. I still wonder though is it physically possible to shoot f4 at 300 on a slr? On a DSLR it wont let me!
No, the same limitations apply.
01-28-2013, 05:43 AM   #12
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Ok. However, when I am at 300 I am still able to set the f stop to 4. Can I assume therefore that although it says f4 it is f5.6? Thanks John
01-28-2013, 05:53 AM   #13
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I would think so.

If you used manual exposure at 300mm expecting it to be f/4,
your negatives would be lighter (prints darker).
Auto exposure should take care of that, though.
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