Sigma 70-300 SM2 + TCON-17

Caussway · 6th September 2005

Has anyone here tried this combo. Pls share your experience,
pictures. Can it still AF ?

donchua · 6th September 2005

Originally Posted by Caussway

Has anyone here tried this combo. Pls share your experience,
pictures. Can it still AF ?

I tried before but on Nikon 70-300mm ED lens.

Caussway · 7th September 2005

Hi don can you share some picture. Can your experience on AF, CA, weight etc.
thanks.

Originally Posted by donchua

I tried before but on Nikon 70-300mm ED lens.

sulhan · 7th September 2005

Hiee...

I do not have experience with the Tcon-17 but to my understanding, form my use of olympus front teleconvertors, they are reat and optics are well corrected for CAs and so on. However, do be careful when attaching the "heavy front" and using the setup on tripod.
I used my Dimage A1 with the tcon14 and its already frontal heavy.

I dont think you loss any stops of light but there might be vignetting. Well, with the 1.5x crop factor, i dont think vigneetin gis an issue here.

rgds,
sulhan

zcf · 7th September 2005

Sulhan, actually between front (Olympus) and back (1.4x, 2x) teleconvertor, which is better optics or less problem.

I mean beside the advantage of the back teleconvertor can fix almost all lens where as, frontback teleconvertor can fix 55mm thread only.

sulhan · 7th September 2005

Originally Posted by zcf

Sulhan, actually between front (Olympus) and back (1.4x, 2x) teleconvertor, which is better optics or less problem.

I mean beside the advantage of the back teleconvertor can fix almost all lens where as, frontback teleconvertor can fix 55mm thread only.

Hiee..ZCF

I only tried the two while in the shop during my A1 days. Well, the only gripe is the vignetting risk. Well, you can use also step-down or step-rings to fix the 55mm to the lens you want to mount on - in this is the route you choose.

In terms of image degradation, well.....you are adding glass in the light path and the thwo optics are not designed in the first place to match. Its best ot go and take a couple of shots with you camera and see the result.

Rgds,
sulhan

zcf · 7th September 2005

thanks Sulhan, since my brother have a Olympus 1.7 Tele, will give it a try later.

Caussway · 7th September 2005

Hi Sulhan thanks for the info. I do own a TCON-17 for sometime now. Used it a lot with my Canon Pro90is. It's indeed a nice optics. The weight and size is balanced well with Pro90is.

The sad thing is, I drop it

and one of element inside is loose now. Thingking of getting another one with a Sigma 70-300mm. It's 1.7x and light loss is minimal ( Oly says no loss ) as compared to rear mount 1.4x which takes 1 stop. And rotating front element may cause
a lot of strain on AF motor with front attachment I guess.

Hope to see some picture taken with this combo

Caussway · 14th September 2005

guys care to share some pictures taken with this combo Or any links where I can find them, thanks.

6th September 2005	#1
Caussway Member Join Date: Dec 2003 Location: Singapore Posts: 995	Sigma 70-300 SM2 + TCON-17 Has anyone here tried this combo. Pls share your experience, pictures. Can it still AF ?

7th September 2005	#4
sulhan Advertiser Join Date: May 2002 Location: Melbourne, Australia Posts: 4,051	Re: Sigma 70-300 SM2 + TCON-17 Hiee... I do not have experience with the Tcon-17 but to my understanding, form my use of olympus front teleconvertors, they are reat and optics are well corrected for CAs and so on. However, do be careful when attaching the "heavy front" and using the setup on tripod. I used my Dimage A1 with the tcon14 and its already frontal heavy. I dont think you loss any stops of light but there might be vignetting. Well, with the 1.5x crop factor, i dont think vigneetin gis an issue here. rgds, sulhan

7th September 2005	#5
zcf Senior Member Join Date: Apr 2005 Location: 270 degree of Singapore Posts: 6,689	Re: Sigma 70-300 SM2 + TCON-17 Sulhan, actually between front (Olympus) and back (1.4x, 2x) teleconvertor, which is better optics or less problem. I mean beside the advantage of the back teleconvertor can fix almost all lens where as, frontback teleconvertor can fix 55mm thread only. __________________ Sony Alpha 700 hobbyist

7th September 2005	#7
zcf Senior Member Join Date: Apr 2005 Location: 270 degree of Singapore Posts: 6,689	Re: Sigma 70-300 SM2 + TCON-17 thanks Sulhan, since my brother have a Olympus 1.7 Tele, will give it a try later. __________________ Sony Alpha 700 hobbyist

7th September 2005	#8
Caussway Member Join Date: Dec 2003 Location: Singapore Posts: 995	Re: Sigma 70-300 SM2 + TCON-17 Hi Sulhan thanks for the info. I do own a TCON-17 for sometime now. Used it a lot with my Canon Pro90is. It's indeed a nice optics. The weight and size is balanced well with Pro90is. The sad thing is, I drop it and one of element inside is loose now. Thingking of getting another one with a Sigma 70-300mm. It's 1.7x and light loss is minimal ( Oly says no loss ) as compared to rear mount 1.4x which takes 1 stop. And rotating front element may cause a lot of strain on AF motor with front attachment I guess. Hope to see some picture taken with this combo

14th September 2005	#9
Caussway Member Join Date: Dec 2003 Location: Singapore Posts: 995	Re: Sigma 70-300 SM2 + TCON-17 guys care to share some pictures taken with this combo Or any links where I can find them, thanks.