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nandbytes View Drop Down
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2019 at 21:55
what's the rules on using teleconverters?

I know its "discouraged" but that not the same as disallowed. I prefer to work with absolutes
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waldo_posth View Drop Down
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Post Options Post Options   Quote waldo_posth Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2019 at 23:30
Well, that seems to me a quite hypothetical question inviting all kinds of philosophical debates.

Let's check the options:

1. So you signed up for the challenge but you do not own a 50mm lens and want to use your 29mm wide angle lens with your 2x tele-converter. If that's the case you should have signed in earlier and should have told about your malaise. I am sure that a Dyxum member would have borrowed you a 50mm lens (I would have done it if you had asked early enough).

2. You own a 50mm lens but you want to try out your 2x tele-converter on it: Please wait till this planet has moved to a wider circle around the sun (so that we can have 100s weeks). But even in that rare case there is some considerable probability that tele-converters will be absolutely discouraged (too chilly to take them out of the bag).

3. There is of course the case where you have a so called Speed-Booster converter that shortens the focal length of your lens so that in combination with a cropped-sensor body the effective focal length will be within the 50-59mm range that the challenge prescribes.

Philosophically this last option is by far the trickiest one:
- A small minority will argue that the earth will have to move to a narrower circle around the sun first (allowing for a year of 37 weeks) so that the week to arrange the challenge will again be two weeks before year's end - all calculated on an effective focal length (ignoring the type of body) of about 35mm with the use of a Speed Booster.
- A tiny bit larger faction of Dyxum's great assembly will point to the fact that we already have a week 35 in our year and will therefore petition for X-mas to be held in September - a neat and nice (and less sweaty) solution, but heavily opposed by the party of owners of full frame bodies.
- A pretty large group will argue that challenges are about using your gear and that would naturally include Speed Boosters.
- This argument meets again heavy opposition (its proponents are in fact scolded as "fake-liberals"!) by the large majority of the great Dyxum assembly - the true liberals. In their wisdom they have allowed from the beginning the use of all kinds of bodies. The consequence ensuing from that prudent decision is: effective focal length does not count! In fact, it may vary according to the crop factor/sensor size of the body (e.g. with a Pentax Q body your 50mm lens will have an effective focal length of 280mm in FF terms, crop factor is 5.53 - and any image shot with that combo would be within the prescribed limits of the challenge).

From these arguments one and only one necessary conclusion can be drawn: Since effective focal length is irrelevant and the use of 50mm lenses is prescribed the answer to your question is:

ALL KINDS OF CONVERTERS ARE FORBIDDEN, ABSOLUTELY!

Q.E.D.

Edited by waldo_posth - 08 December 2019 at 23:45
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Post Options Post Options   Quote waldo_posth Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2019 at 23:35
If this turns out to be flawed thinking or a majority override happens the final judgment might be different.
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 00:08
I believe I used a focal reducer in previous years. I am not likely to use it this year. I did just check how much full-frame coverage it gave with various lenses. The MC 58mm F1.4 had the most coverage.

It does strike me that adhering to focal lengths instead of field-of-view is rather gear oriented, rather than practical and artistic. But I am fine with celebrating gear.
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Post Options Post Options   Quote Wilu Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 07:36
Was gonna sign up and give it a try with my Buroni and the Zenzanon 50mm f2.8, but then I realised that the challenge is pic-a-day. That's not doable with film for me, particularly in this rather crowded week. I'll have to pass, unfortunately.
Wish you all an enjoyable challenge and a lot of fun!
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 07:47
Originally posted by QuietOC QuietOC wrote:


It does strike me that adhering to focal lengths instead of field-of-view is rather gear oriented, rather than practical and artistic. But I am fine with celebrating gear.
I just think it's simple and straight forward, focal length is a measurable optical property of a lens, so objective and practical.
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nandbytes View Drop Down
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 09:05
I think we should have a referendum on this

Originally posted by pegelli pegelli wrote:

I just think it's simple and straight forward, focal length is a measurable optical property of a lens, so objective and practical.


Well if we are going by physical/optical property of a lens then 2x on 25mm or 1.4x on 40mm should be allowed as optically they will all give us 50-ish mm.

p.s. I do own a 50mm lens so I won't be doing this and my question was more for using TC on the 50mm prime which is clearly a no
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 10:24
Originally posted by nandbytes nandbytes wrote:


Well if we are going by physical/optical property of a lens then 2x on 25mm or 1.4x on 40mm should be allowed as optically they will all give us 50-ish mm.
Well, see point #1 of Haralds post. The focal length of the combined optical system might be 50-ish mm, but the lens itself isn't. For us it's the lens that counts so no referendum as far as I'm concerned. If people want to use "focal length modifiers" in Dyxum challenges there's always 30 days in April and 31 days in Oktober to do so. So not having this flexibilty during the seven days of week 50 should not be the biggest problem in world.
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 11:16
While its fun debating hypotheticals I don't think anyone is actually wanting to do this.

But what I would like to do is be able to use APS-C crop mode. Is this allowed?
While I appreciate cropping in post wouldn't be allowed, the APS-C crop mode does force me to compose as if it were an APS-C camera in the EVF. So I think this should be fair game
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 11:21
Originally posted by nandbytes nandbytes wrote:


But what I would like to do is be able to use APS-C crop mode. Is this allowed?
I see no problem with that, since APS-C cameras are allowed as well. And with your new camera you even get more pixels that way than the "standard" APS-C cameras.
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mikey2000 View Drop Down
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Post Options Post Options   Quote mikey2000 Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 22:58
I just saw this! I've been woefully absent from all things photographic since Oktoberfest. I've not clicked a single frame and my a99ii last shot was in September apparently.

!!!!!

So, I'm in. I have a variety of 50s. I've never tried them with teleconverters (and have no intention!) Maybe an extension tube though
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    waldo_posth View Drop Down
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    Post Options Post Options   Quote waldo_posth Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2019 at 23:12
    Welcome Mike - good to have you back at the shutter release!
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