Originally posted by Interstellar Whale so for context i currently use a
SMC Pentax-DA 50-200mm F4-5.6 ED but i'm finding it lacking in sharpness (i haven't used it a lot, so it might be sharper if change settings.), but i also think it's not enough telephoto. so i was looking around and found this lens
SMC Pentax-FA 100-300mm F4.7-5.8 and wondered if using a older lens might be a good idea? i don't want to spend too much since i don't think i will be using it very regularly. but it needs to be automatic since i'm mainly planning on shooting wildlife with it.
First, I'd practice with the 50-200mm you've already got.
The example I have is perfectly adequate as far as sharpness goes, so, unless yours is faulty, your lack of sharpness may well be down to technique.
I also have an FA 100-300mm f/4.5-5.6 (slightly different model) and again, it's a good lens, but if you can't get a clear picture with a 200mm lens, a 300mm lens will be even worse!
What shutter speeds are you using?
Most wildlife moves. Combine that with disturbance from wind or even unsteadiness from uneven terrain and you've got a "perfect storm" for blurred pictures.
My "default" settings are TAv, 1/1500sec @ f/8. That'll cope with most scenarios.
If the light's good and the subject static you can wind down the shutter speed and take any advantage available from a lower ISO, but at least you should be in a position to start with that'll give you a good shot
I also have the Tamron 70-300mm and find it very adequate, if a little "quirky" when being used as a macro at 300mm … excellent for butterflies and similar, but it is what may be described as a "two-stage" lens, the macro facility needs to be separately engaged, and it only works at the telephoto (180-300mm) end, so there can be a bit of "double-shuffle" to change from macro to wider angle or vice-versa.
Good luck!
Last edited by kypfer; 12-11-2022 at 03:04 PM.