Hi,
Just bought a Sigma AF 100-300mm f4.5-6.7 DL (rated 6.3
PentaxForums.com Third-Party Lens Review Database - Sigma 100-300mm f4.5-6.7 DL Lens Reviews) for £50 as I urgently wanted a longer lens than what I had with me.
To me, "wide open" (f6.7 doesn't sound very wide...) at the long end is unacceptably soft for me - see 100% crop straight from the camera below, click for full size:
1/1000s at f6.7, ISO400
Is it possible to get a sharp 300mm AF lens for not much cash?! Options (ie ones that come up frequently on eBay UK):
- Tamron 70-300mm F/4-5.6 Di LD Macro 1:2 (rated 7.6)
- Pentax SMC FA 100-300mm F/4.7-5.8 (8.6)
- Pentax SMC DA 55-300mm F/4.5-5.8 ED (8.94)
- Pentax SMC FA 80-320mm F/4.5-5.6 (6.75)
- Pentax SMC FA 100-300mm F/4.5-5.6 (6.75)
- Pentax SMC FA J 75-300mm F/4.5-5.8 AL (7.75)
- Sigma 70-300mm F/4-5.6 APO DG Macro (7.8)
- Sigma SLD 28-300mm F/3.5-6.3 DG Macro (unrated)
- Tamron 75-300mm F/4-5.6 LD (unrated)
If not, is better to get a potentially sharper 200mm and crop?
- Pentax SMC DA 50-200mm F/4-5.6 ED (7.6)
- Pentax SMC FA 80-200mm F/4.7-5.6 (5.0)
- Pentax SMC F 70-210mm F/4-5.6 (8.3)
- Sigma 70-210mm F/4-5.6 (7.0)
- Tamron 80-210mm f4.5-5.6 (8.0)
- Pentax SMC F 80-200mm F/4.7-5.6 (7.5)
I also own an original Tamron 28-200 F/3.8-5.6 (same as SMC Pentax-FA 28-200mm F3.8-5.6 AL (rated 7.3)), but find this soft too.
Looks like 55-300mm has the best score, but am keen that FF glass is effectively cropped on APS-C which contributes to edge sharpness.
Am I on an impossible mission!? Would be grateful of any opinions and experiences.
PS Obviously what I'd really like is a DA*300mm / DA*60-250 / FA*300mm ...