300 mm lens compatility and quality

[ron_wickham]

Looking at Pentax SMC 300mm f/4 MANUAL FOCUS lens on Ebay. Plan to use it with

my Pentax 2x converter for wildlife. Will this be compatible with my K100D and

is it decent quality....first time SLR user...this forum has been a lot of

help....thanks again........

[daniel_tong1]

Firstly, it is compatible with your K100D which is what I have.

But do not bet on using the 2x TC. I have the A version of 300mmF4. Quality-wise it sucks. There were report of success with the TC AF1.7x though. But that costs almost the same price as your M300mmF4.

 

Daniel

[glivingston]

Pentax made three versions of the 300mm f/4. You can find reviews at http://stans-photography.info/ and more information at http://kmp.bdimitrov.de/ I think you may be looking at the older K version, which is probably a good lens. However the M and A versions are considered to be classics and are two of the best lenses that Pentax ever made. Unfortunately they seldom come on the market and when they do sell for $700-$800, but they are worth waiting for and saving for. I have the 300 f/4 A and it is a superb lens. It is outstanding on either my ist film camera or my istD digital. I use it with a 1.4x Pentax converter with almost no loss of clarity. I do not have a 2x converter but most wildlife photographers do not recommend them. All older Pentax lenses are compatible with the K100D. Hope this helps.