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07-09-2008, 07:06 AM   #1
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Lens Comparison

Hi,

I have a 70-210mm and a 50mm that I purchased with a SFXn which is about 20 years old. Unfortunately, I stopped using the camera about 15 years ago due to the high cost of processing film in Barbados where I live.

I finally decided to take the plunge into the DSLR world and purchased a K200D with a 18-55mm.

I have been taking some comparision pics and have noticed that pics taken with the 70-210mm appear to have grayish/brownish hue. I have tried to increase the exposure by .5 and the 1.0, but that didn't make a difference.

Could this be a lens problem due to non-use (sitting in the bag for so long), or could it be a user problem.

Pic on left is with the 70-210 and right with the 18-55.

Thanks

Steve

Attached Images
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PENTAX K200D  Photo 
View Picture EXIF
PENTAX K200D  Photo 

Last edited by siric; 07-09-2008 at 07:08 AM. Reason: Correct Typo.
07-09-2008, 07:14 AM   #2
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Is this the Pentax SMC F 70-210? What I'm seeing is not a "grayish/brownish hue" but a real drop in contrast. Is the lens hazy or have any clouding to the glass? Have a close look through the lens without caps and see how clean the glass is.

If this is another lens then there could be another explaination. If it's an M lens and being used with a flash, the newer exposure system/mount (KAF2) will not meter correctly with older glass.
07-09-2008, 07:29 AM   #3
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I'm thinking element seperation or fungus.
Or it's just a junk lens.
07-09-2008, 08:36 AM   #4
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QuoteOriginally posted by Peter Zack Quote
Is this the Pentax SMC F 70-210? What I'm seeing is not a "grayish/brownish hue" but a real drop in contrast. Is the lens hazy or have any clouding to the glass? Have a close look through the lens without caps and see how clean the glass is.

If this is another lens then there could be another explaination. If it's an M lens and being used with a flash, the newer exposure system/mount (KAF2) will not meter correctly with older glass.
Hi Peter,

Thanks for the quick response!!

Yes, it is a SMC F 70-210. I have cleaned the lens but still get the problem. Yes it is more a contrast issue when you look at them on screen. On the camera, it looks like a hue.

I have looked at the lens at there is some sort of growth?? fungus maybe on the inside. I have attached a pic. When I take pics with the 50mm they turn out the same way.

Thanks

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PENTAX K200D  Photo 
07-09-2008, 09:15 AM   #5
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Sorry to hear your issue, truth is, I too have a similar issue with a M55 1.7 I have. The fungus seemed to have damaged the lens. I have tried to send it to a shop to have them pull it apart and clean the lens. I helped, but I am not sure the lens ever performed the way it ought to. (I have no other 55 to compare it to).

Good luck
07-09-2008, 09:41 AM   #6
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Well it is a little tough to tell but I'd say you have a fair fungus growth there. The reflections also seem to show a bit of lens seperation. You may have both. Unfortunately you could buy a replacement for less than this may cost to have cleaned/fixed. It will only continue to get worse and shouldn't be stored with your other clean lenses.

The growth is inside and the lens must be stripped down to clean because the fungus will be on the internal parts as well as the glass.

Methinks it's time to invest in a new lens. Maybe a Tamron 70-300mm?
07-09-2008, 09:51 AM   #7
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Thanks for the advise.

I can't complain as I have had the lenses for a long time and in the recent past did not give them the care that they deserved.

Anyway, I was looking at the Pentax 55-300, but the Tamron is a bit more in my price range right now.

Will look into it.


Thanks again.

Steve
07-09-2008, 08:11 PM   #8
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QuoteQuote:
Anyway, I was looking at the Pentax 55-300, but the Tamron is a bit more in my price range right now.


Steve
The Pentax 55-300 has nice image quality, though its 2+ times the cost of a Tamron (and no quasi macro mode). It has replaced both my Pentax 50-200 and Sigma 70-300.

07-09-2008, 08:51 PM   #9
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QuoteOriginally posted by SpecialK Quote
The Pentax 55-300 has nice image quality, though its 2+ times the cost of a Tamron (and no quasi macro mode). It has replaced both my Pentax 50-200 and Sigma 70-300.


JUst how good is the IQ SpecialK,when compared to tamron/sigma 70-300 and if possible to have some pixs for comparsions


cheers
07-10-2008, 06:26 AM   #10
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QuoteOriginally posted by siric Quote
Hi,

I have a 70-210mm and a 50mm that I purchased with a SFXn which is about 20 years old. Unfortunately, I stopped using the camera about 15 years ago due to the high cost of processing film in Barbados where I live.

I finally decided to take the plunge into the DSLR world and purchased a K200D with a 18-55mm.

I have been taking some comparision pics and have noticed that pics taken with the 70-210mm appear to have grayish/brownish hue. I have tried to increase the exposure by .5 and the 1.0, but that didn't make a difference.

Could this be a lens problem due to non-use (sitting in the bag for so long), or could it be a user problem.

Pic on left is with the 70-210 and right with the 18-55.

Thanks

Steve
I had similar problems with an old Sigma 28-200 that appeared clean. I attributed it to being just a junk lens. In retrospect, now I know why all of our old film pictures were washed out - I always thought it had been exposure error but it seems like the lens didn't help at all.
07-10-2008, 07:08 AM   #11
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QuoteOriginally posted by cupic Quote
JUst how good is the IQ SpecialK,when compared to tamron/sigma 70-300 and if possible to have some pixs for comparsions
Sharpness vs Tamron:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/31269-sharpnes...-55-300mm.html


These zoo shots were all taken with the 55-300mm except the Pink Flamingoes (50mm f1.4). The tiger was shot wide open at 300mm:
Picasa Web Albums - Dan - Toronto Zoo
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