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12-13-2010, 07:58 AM   #16
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Great test! I always enjoy these types of comparo's
To bad the 55-300 wasn't in the mix. I would of loved to see how it measured-up against the competition.

Anyone care to guess?

12-13-2010, 08:05 AM   #17
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QuoteOriginally posted by JohnBee Quote
Great test! I always enjoy these types of comparo's
To bad the 55-300 wasn't in the mix. I would of loved to see how it measured-up against the competition.

Anyone care to guess?
my bet would be at 300mm the K300F4 would beat it cleanly both center and edge sharpness.
12-13-2010, 08:16 AM   #18
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QuoteOriginally posted by Lowell Goudge Quote
my bet would be at 300mm the K300F4 would beat it cleanly both center and edge sharpness.
Sounds interesring. Though, I wonder how the 55-300 would do against the K300 insofar as contrast resolution and CA and PF goes.

I picked-up a K300/4 for my K collection about two years ago, and that's one of the problems I encountered with it on a crop sensor. The CA and PF was a real issue, especially in the OOF regions.
12-13-2010, 08:18 AM   #19
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Thanks for doing these tests. It's good to see my old K 300/4 still fares so well after 30+ years.

Tom G

12-13-2010, 09:18 AM   #20
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QuoteOriginally posted by JohnBee Quote
Sounds interesring. Though, I wonder how the 55-300 would do against the K300 insofar as contrast resolution and CA and PF goes.

I picked-up a K300/4 for my K collection about two years ago, and that's one of the problems I encountered with it on a crop sensor. The CA and PF was a real issue, especially in the OOF regions.
With respect to CA, the 300F4 shows lateral CA in the OOF regions and this is absolutely independant of the sensor, I have many scans from film that show this also. For me it is not a big issue.

With respect to true PF I have not had that happen with the 300F4 so I just don't worry about it.

If you don't like CA in the OOF regions any old lens is not for you.
12-13-2010, 01:59 PM   #21
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QuoteOriginally posted by JohnBee Quote
Sounds interesring. Though, I wonder how the 55-300 would do against the K300 insofar as contrast resolution and CA and PF goes.

I picked-up a K300/4 for my K collection about two years ago, and that's one of the problems I encountered with it on a crop sensor. The CA and PF was a real issue, especially in the OOF regions.
CAs and PF are an issue with the old K 300/4. I've been using it for years and this can be minimized somewhat by avoiding high contrast situations, stopping down and keeping the sun at your back whenever possible. Not a perfect solution but it will allow you to get the best out of your K 300/4.



Some of my better bird shots have come from the K 300/4.

Tom G
12-13-2010, 04:20 PM   #22
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Thanks for the tests. A couple of comments:

QuoteOriginally posted by Just1MoreDave Quote
I decided that this did not affect the results enough to worry about it.
I believe it is very crucial in what part of the frame the light source is. Small difference in position can have a big influence on the flare pattern.

QuoteOriginally posted by Just1MoreDave Quote
In order to get the same image size, the 90mm lens was about 15.5 inches away, while the 70-300 was 37 inches away.
I think the better approach would have been to use exactly the same distance for both lenses and zoom the 70-300 until it shows the same framing as the prime. The focal length labels on zooms are often very unreliable in particular with short distances and internal focus designs.

QuoteOriginally posted by JohnBee Quote
Though, I wonder how the 55-300 would do against the K300 insofar as contrast resolution and CA and PF goes.
Member Frogfish shared some (short) thoughts over here comparing the 55-300 to the Tamron 75-300 and the Pentax 80-320.
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