Tamron 31A (200-500 5.6) vs Pentax 150-450 4.5-5.6

Started 4 months ago | Questions thread
OP gkreth Veteran Member • Posts: 3,128
Re: Tamron 31A (200-500 5.6) vs Pentax 150-450 4.5-5.6

xmeda wrote:

gkreth wrote:

Ah, I see, now. Well, that brings up an interesting point....
I already have the 60-240 f/4, as well as the Tamron 1.4x TC and Tamron 2x TC.
I suppose I could try playing with those combinations, to see what I get. Of course, with the 1.4x, I'm only getting to 336mm, so I'd really have to use the 2x.
For quite some time, I searched eBay for a Sigma 100-300 f/4; I think I stopped looking when I got the 60-240.

Sig100-300/4 is all-metal FF fast focusing hi-end single tube lens and if you manage to find good EX DG sample, you will never regret. If only Ricoh created similar tool with latest glass technology... it is large and heavy, but still not like Sigma 120-300/2.8 and I do not understand why Sigma stopped that lens. Maybe due to problematic OS implementation in such design for other systems, but now they can re-use it again for ILC cameras with IBIS. With F4 it is the sweet spot between providing lens fast enough while still keeping it in usable size, weight and price. And with constant F4 it is better for video than variables.

I have Pentax F1.7xAF TC and Kenko SHQ 1.5x and 2x.
1.7x AFTC is doing AF through TC adaptor, image quality is acceptable, SR needs focal length input manually.
1.5x Kenko jut transfers everything through, but sometimes it is better to switch SR off and just use fast shutter speed 1/500s+ as otherwise camera still thinks that 300mm is mounted on, image output is comparable to DA55-300 output at 300mm if we talk about resolution.
2x Kenko again transfers everything, SR off and fast shutter is needed, Ideally around 1/1000s, some drop of image output, especially contrast is there, AF is slower and not that reliable, but you still have AF 600mm F8. Good on tripod, not that good hand-held, but usable. Original Sigma TC might do better job there.

I wonder why it is not allowed to set focal length manually and override what lens provides through contacts. That will simplify TC usage so much...

Yeah, I think that's why I stopped using TCs; I rely a lot on SR.

Right now on vacations I take a Panasonic FZ1000; it seems like a nice compromise between size/weight, no lens-swapping, IQ, and range (24mm-400mm).
But sometimes I miss the larger sensor, and wonder if it's worth hauling around a 500mm. I guess I should walk around some of the local parks with my current 50-500, and see after an hour if I really want to take a 50-500 on vacation... LOL!


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